diff --git a/src/game/wilderness-jungles.ts b/src/game/wilderness-jungles.ts
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+/**
+ * Diablo II Act 3 Jungle River Network & Branch Topology Algorithm (`DRLG_GenerateJungles`).
+ *
+ * In Diablo II, the vast outdoor jungle zones of Act 3 — Spider Forest (76), Great Marsh (77),
+ * and Flayer Jungle (78) — are procedurally assembled from a macro-grid of 32x32 presets.
+ * Rather than a trivial static two-column strip, the authentic generation engine builds:
+ *
+ * 1. Meandering River Network:
+ *    - River channels that wind across multiple columns rather than staying in a fixed channel.
+ *    - Flow direction tracking to select authentic directional river presets (`NS`, `EW`, `NE`, `NW`, `SE`, `SW`).
+ * 2. River Forks / Junctions:
+ *    - Branches splitting into secondary tributary channels using T-junction and cross presets (`NSE`, `NSW`, `NEW`, `SEW`, `NSEW`).
+ * 3. River Island Clearings:
+ *    - Clearings bordered by river channels on multiple sides (e.g. 2 or more orthogonal sides), forming defensible enclaves.
+ * 4. Wooden Bridges:
+ *    - Wooden bridge crossings (`Act 3 - Bridge`) spanning river channels to connect island clearings and opposite banks.
+ * 5. Branching Multi-Zone Topology:
+ *    - Models the non-linear progression between Spider Forest (76), Great Marsh (77), and Flayer Jungle (78).
+ *    - Reproduces the iconic "Great Marsh Skip": in ~75% of seeds, Spider Forest connects directly to Flayer Jungle,
+ *      allowing Great Marsh to be an optional side branch (or dead-end swamp). In the remaining seeds, Great Marsh
+ *      serves as the mandatory throughway.
+ */
+
+import type { Ds1, Ds1Cell, Ds1Floor, Ds1Wall } from '../formats/ds1.ts'
+import { Rng } from './rng.ts'
+import type { Canvas, SubstitutionReport, WildernessPiece, WildernessStats } from './wilderness.ts'
+
+/** Connection between two Act 3 zones. */
+export interface JungleZoneConnection {
+  readonly fromLevelId: number
+  readonly toLevelId: number
+  readonly fromZone: string
+  readonly toZone: string
+  readonly direction: 'north' | 'south' | 'east' | 'west'
+  readonly connectionType: 'main' | 'branch' | 'skip'
+  readonly gatePosition?: { readonly x: number; readonly y: number }
+}
+
+/** Global 3-zone topological progression graph. */
+export interface JungleTopology {
+  readonly seed: number
+  readonly zones: readonly {
+    readonly levelId: number
+    readonly name: string
+    readonly isDeadEnd: boolean
+  }[]
+  readonly connections: readonly JungleZoneConnection[]
+  readonly hasMarshSkip: boolean
+  readonly marshIsDeadEnd: boolean
+}
+
+/** River network layout statistics. */
+export interface JungleRiverNetwork {
+  readonly meanderingPath: readonly { readonly col: number; readonly row: number }[]
+  readonly meanderCount: number
+  readonly forks: readonly { readonly col: number; readonly row: number; readonly pieceName?: string }[]
+  readonly islands: readonly { readonly col: number; readonly row: number; readonly pieceName?: string }[]
+  readonly bridges: readonly { readonly col: number; readonly row: number; readonly x: number; readonly y: number; readonly pieceName: string }[]
+  readonly clearings: readonly { readonly col: number; readonly row: number; readonly pieceName: string; readonly isIsland: boolean }[]
+}
+
+/** Complete layout statistics for an Act 3 Jungle level. */
+export interface JungleLayoutStats {
+  readonly levelId: number
+  readonly levelName: string
+  readonly gridColumns: number
+  readonly gridRows: number
+  readonly riverNetwork: JungleRiverNetwork
+  readonly topology: JungleTopology
+}
+
+/** Macro-grid cell types. */
+export type JungleCellType = 'river' | 'clearing' | 'head' | 'tail'
+
+/** Macro-grid cell representation. */
+interface MacroGridCell {
+  col: number
+  row: number
+  type: JungleCellType
+  flowDirs: Set<'N' | 'S' | 'E' | 'W'>
+  isFork?: boolean
+  isIsland?: boolean
+  pieceName?: string
+}
+
+/**
+ * Builds the authentic Act 3 Jungle multi-zone branching topology.
+ *
+ * In Diablo II:
+ * - Spider Forest (76) begins at Kurast Docks (75).
+ * - Spider Forest always connects to Great Marsh (77).
+ * - In ~75% of world seeds, Spider Forest also connects directly to Flayer Jungle (78) (the Great Marsh skip).
+ * - When the skip is active, Great Marsh can either be a dead-end swamp (~50%) or loop back into Flayer Jungle.
+ * - When the skip is inactive, Great Marsh is guaranteed to connect forward to Flayer Jungle (ensuring reachability).
+ */
+export function buildJungleTopology(seed: number): JungleTopology {
+  const rng = new Rng(seed).fork('jungle-topology')
+  // ~75% chance for direct Spider Forest -> Flayer Jungle skip
+  const hasMarshSkip = rng.int(0, 3) !== 0
+  // If no skip, Great Marsh must connect to Flayer Jungle. If skip exists, Great Marsh can be dead-end.
+  const marshIsDeadEnd = hasMarshSkip && rng.chance(0.5)
+
+  const connections: JungleZoneConnection[] = [
+    {
+      fromLevelId: 75,
+      toLevelId: 76,
+      fromZone: 'Kurast Docks',
+      toZone: 'Spider Forest',
+      direction: 'south',
+      connectionType: 'main',
+    },
+    {
+      fromLevelId: 76,
+      toLevelId: 77,
+      fromZone: 'Spider Forest',
+      toZone: 'Great Marsh',
+      direction: 'east',
+      connectionType: 'branch',
+    },
+  ]
+
+  if (hasMarshSkip) {
+    connections.push({
+      fromLevelId: 76,
+      toLevelId: 78,
+      fromZone: 'Spider Forest',
+      toZone: 'Flayer Jungle',
+      direction: 'north',
+      connectionType: 'skip',
+    })
+  }
+
+  if (!marshIsDeadEnd) {
+    connections.push({
+      fromLevelId: 77,
+      toLevelId: 78,
+      fromZone: 'Great Marsh',
+      toZone: 'Flayer Jungle',
+      direction: 'north',
+      connectionType: hasMarshSkip ? 'branch' : 'main',
+    })
+  }
+
+  connections.push({
+    fromLevelId: 78,
+    toLevelId: 79,
+    fromZone: 'Flayer Jungle',
+    toZone: 'Lower Kurast',
+    direction: 'north',
+    connectionType: 'main',
+  })
+
+  const zones = [
+    { levelId: 76, name: 'Spider Forest', isDeadEnd: false },
+    { levelId: 77, name: 'Great Marsh', isDeadEnd: marshIsDeadEnd },
+    { levelId: 78, name: 'Flayer Jungle', isDeadEnd: false },
+  ]
+
+  return {
+    seed,
+    zones,
+    connections,
+    hasMarshSkip,
+    marshIsDeadEnd,
+  }
+}
+
+/**
+ * Finds the most suitable directional river piece from available pieces.
+ */
+function pickRiverPiece(
+  pieces: readonly WildernessPiece[],
+  flowDirs: Set<'N' | 'S' | 'E' | 'W'>,
+  rng: Rng,
+): WildernessPiece | null {
+  const riverPieces = pieces.filter(
+    p =>
+      p.name.startsWith('Act 3 - Jungle ') &&
+      p.name !== 'Act 3 - Jungle Head' &&
+      p.name !== 'Act 3 - Jungle Tail' &&
+      p.levels.length > 0,
+  )
+  if (riverPieces.length === 0) return null
+
+  const requiredTokens = Array.from(flowDirs)
+  const tokenStr = requiredTokens.sort().join('')
+
+  // 1. Exact match on token (e.g. "Act 3 - Jungle NS", "Act 3 - Jungle SW", etc.)
+  const exactMatches = riverPieces.filter(p => {
+    const rest = p.name.replace(/^Act 3 - Jungle\s+/i, '').trim()
+    const tokens = rest.split(/\s+/)
+    return tokens.some(t => t.toUpperCase() === tokenStr)
+  })
+  if (exactMatches.length > 0) return exactMatches[rng.int(0, exactMatches.length - 1)]!
+
+  // 2. Subset / superset match containing all required directions
+  const supersetMatches = riverPieces.filter(p => {
+    const rest = p.name.replace(/^Act 3 - Jungle\s+/i, '').trim()
+    return requiredTokens.every(d => rest.includes(d))
+  })
+  if (supersetMatches.length > 0) return supersetMatches[rng.int(0, supersetMatches.length - 1)]!
+
+  // 3. Fallback to any river piece
+  return riverPieces[rng.int(0, riverPieces.length - 1)]!
+}
+
+/**
+ * Finds the most suitable clearing piece matching the Act 3 sub-theme.
+ */
+function pickClearingPiece(
+  pieces: readonly WildernessPiece[],
+  levelId: number,
+  preferredOpening: 'E' | 'W' | 'N' | 'S' | null,
+  rng: Rng,
+): WildernessPiece | null {
+  const prefix =
+    levelId === 76
+      ? 'Act 3 - Clearing Webby'
+      : levelId === 77
+        ? 'Act 3 - Clearing Boggy'
+        : 'Act 3 - Clearing Pygmy'
+
+  let pool = pieces.filter(p => p.name.startsWith(prefix) && p.levels.length > 0)
+  if (pool.length === 0) {
+    pool = pieces.filter(p => p.name.startsWith('Act 3 - Clearing') && p.levels.length > 0)
+  }
+  if (pool.length === 0) return null
+
+  if (preferredOpening) {
+    const openingMatches = pool.filter(p => p.name.includes(preferredOpening))
+    if (openingMatches.length > 0) return openingMatches[rng.int(0, openingMatches.length - 1)]!
+  }
+
+  return pool[rng.int(0, pool.length - 1)]!
+}
+
+/**
+ * Stamps wooden bridge floor tiles directly across the water channel.
+ */
+function synthesizeBridgePlanks(
+  canvas: Canvas,
+  bridgeX: number,
+  bridgeY: number,
+  orientation: 'horizontal' | 'vertical',
+): void {
+  const makeBridgeFloor = (): Ds1Floor => ({
+    prop1: 2,
+    sequence: 0,
+    style: 4,
+    unknown1: 0,
+    unknown2: 0,
+    hidden: false,
+  })
+
+  // A 4-tile wide plank walkway bridging across the 32-tile river channel
+  if (orientation === 'horizontal') {
+    for (let dy = 14; dy <= 17; dy += 1) {
+      for (let dx = 0; dx < 32; dx += 1) {
+        const cx = bridgeX + dx
+        const cy = bridgeY + dy
+        if (cy >= 0 && cy < canvas.height && cx >= 0 && cx < canvas.width) {
+          const row = canvas.cells[cy]
+          if (row?.[cx]) {
+            ;(row[cx]!.floors as Ds1Floor[])[0] = makeBridgeFloor()
+          }
+        }
+      }
+    }
+  } else {
+    for (let dx = 14; dx <= 17; dx += 1) {
+      for (let dy = 0; dy < 32; dy += 1) {
+        const cx = bridgeX + dx
+        const cy = bridgeY + dy
+        if (cy >= 0 && cy < canvas.height && cx >= 0 && cx < canvas.width) {
+          const row = canvas.cells[cy]
+          if (row?.[cx]) {
+            ;(row[cx]!.floors as Ds1Floor[])[0] = makeBridgeFloor()
+          }
+        }
+      }
+    }
+  }
+}
+
+/**
+ * `DRLG_GenerateJungles`: The authentic Act 3 Jungle River Network & Branch Topology Algorithm.
+ *
+ * Assembles a dynamic multi-preset macro-grid featuring:
+ * - Meandering river paths wandering across columns.
+ * - River forks splitting into secondary tributary channels.
+ * - Island clearings surrounded by river channels.
+ * - Wooden bridges crossing river channels to connect trails and islands.
+ * - Multi-zone branching topology (Spider Forest 76, Great Marsh 77, Flayer Jungle 78).
+ */
+export function DRLG_GenerateJungles(
+  canvas: Canvas,
+  levelId: number,
+  pieces: readonly WildernessPiece[],
+  rng: Rng,
+  stats: WildernessStats,
+  stampDs1Fn: (canvas: Canvas, source: Ds1, originX: number, originY: number) => number,
+): Set<string> {
+  const placed = new Set<string>()
+
+  const numCols = Math.max(2, Math.floor(canvas.width / 32))
+  const numRows = Math.max(3, Math.floor(canvas.height / 32))
+
+  // 1. Build and record the 3-zone branching topology
+  const topology = buildJungleTopology(rng.seed)
+  stats.jungleTopology = topology
+
+  // 2. Initialize Macro-Grid
+  const grid: MacroGridCell[][] = []
+  for (let r = 0; r < numRows; r += 1) {
+    const row: MacroGridCell[] = []
+    for (let c = 0; c < numCols; c += 1) {
+      row.push({
+        col: c,
+        row: r,
+        type: 'clearing',
+        flowDirs: new Set(),
+      })
+    }
+    grid.push(row)
+  }
+
+  // Row 0 is Tail, Row numRows - 1 is Head
+  for (let c = 0; c < numCols; c += 1) {
+    grid[0]![c]!.type = 'tail'
+    grid[numRows - 1]![c]!.type = 'head'
+  }
+
+  // 3. Generate Meandering River Path from Head (row numRows - 1) to Tail (row 0)
+  // Kurast River Head and Tail naturally connect to the East column (col 1 in 2-col layout)
+  const startCol = Math.min(1, numCols - 1)
+  const endCol = Math.min(1, numCols - 1)
+
+  let currentCol = startCol
+  const meanderingPath: { col: number; row: number }[] = []
+  meanderingPath.push({ col: currentCol, row: numRows - 1 })
+  grid[numRows - 1]![currentCol]!.flowDirs.add('N')
+
+  let meanderCount = 0
+  // Target row to initiate column meander
+  const primaryMeanderRow = Math.max(1, Math.floor((numRows - 1) / 2))
+
+  for (let r = numRows - 2; r >= 1; r -= 1) {
+    let nextCol = currentCol
+
+    // Meander to adjacent column when at target row or on random roll
+    if (r === primaryMeanderRow || (r === primaryMeanderRow + 1 && rng.chance(0.6))) {
+      if (numCols === 2) {
+        nextCol = 1 - currentCol
+      } else {
+        const step = rng.chance(0.5) ? -1 : 1
+        nextCol = Math.max(0, Math.min(numCols - 1, currentCol + step))
+      }
+    }
+
+    if (nextCol !== currentCol) {
+      meanderCount += 1
+      // Connect directional flows between old and new columns
+      if (nextCol < currentCol) {
+        grid[r]![currentCol]!.flowDirs.add('W')
+        grid[r]![nextCol]!.flowDirs.add('E')
+      } else {
+        grid[r]![currentCol]!.flowDirs.add('E')
+        grid[r]![nextCol]!.flowDirs.add('W')
+      }
+      currentCol = nextCol
+    }
+
+    grid[r]![currentCol]!.type = 'river'
+    grid[r]![currentCol]!.flowDirs.add('S')
+    grid[r]![currentCol]!.flowDirs.add('N')
+    meanderingPath.push({ col: currentCol, row: r })
+  }
+
+  // Ensure tail connection
+  if (currentCol !== endCol) {
+    meanderCount += 1
+    if (endCol < currentCol) {
+      grid[1]![currentCol]!.flowDirs.add('W')
+      grid[1]![endCol]!.flowDirs.add('E')
+    } else {
+      grid[1]![currentCol]!.flowDirs.add('E')
+      grid[1]![endCol]!.flowDirs.add('W')
+    }
+    currentCol = endCol
+  }
+  grid[0]![endCol]!.flowDirs.add('S')
+  meanderingPath.push({ col: endCol, row: 0 })
+
+  // 4. Generate River Fork / Tributary Branch
+  const forkRow = Math.max(1, Math.min(numRows - 2, primaryMeanderRow))
+  const mainCellAtFork = grid[forkRow]![meanderingPath.find(p => p.row === forkRow)?.col ?? 0]!
+  const forkCol = numCols === 2 ? 1 - mainCellAtFork.col : (mainCellAtFork.col === 0 ? 1 : mainCellAtFork.col - 1)
+
+  const forks: { col: number; row: number; pieceName?: string }[] = []
+  mainCellAtFork.isFork = true
+  if (forkCol < mainCellAtFork.col) {
+    mainCellAtFork.flowDirs.add('W')
+    grid[forkRow]![forkCol]!.flowDirs.add('E')
+  } else {
+    mainCellAtFork.flowDirs.add('E')
+    grid[forkRow]![forkCol]!.flowDirs.add('W')
+  }
+  grid[forkRow]![forkCol]!.type = 'river'
+  grid[forkRow]![forkCol]!.flowDirs.add('N')
+  grid[forkRow]![forkCol]!.flowDirs.add('S')
+
+  forks.push({ col: mainCellAtFork.col, row: forkRow })
+
+  // 5. Identify River Island Clearings
+  // Any clearing cell flanked by river on 2 or more orthogonal sides is an island clearing
+  const islands: { col: number; row: number; pieceName?: string }[] = []
+  const clearings: { col: number; row: number; pieceName: string; isIsland: boolean }[] = []
+
+  for (let r = 1; r < numRows - 1; r += 1) {
+    for (let c = 0; c < numCols; c += 1) {
+      const cell = grid[r]![c]!
+      if (cell.type !== 'clearing') continue
+
+      let riverNeighbors = 0
+      if (c > 0 && grid[r]![c - 1]!.type === 'river') riverNeighbors += 1
+      if (c < numCols - 1 && grid[r]![c + 1]!.type === 'river') riverNeighbors += 1
+      if (r > 0 && grid[r - 1]![c]!.type === 'river') riverNeighbors += 1
+      if (r < numRows - 1 && grid[r + 1]![c]!.type === 'river') riverNeighbors += 1
+
+      if (riverNeighbors >= 2) {
+        cell.isIsland = true
+        islands.push({ col: c, row: r })
+      }
+    }
+  }
+
+  // Ensure at least one island clearing exists whenever river forks
+  if (islands.length === 0 && numRows >= 4) {
+    const candidateR = forkRow === 1 ? 2 : 1
+    const candidateC = numCols === 2 ? 1 - grid[candidateR]![0]!.col : 1
+    const candidateCell = grid[candidateR]?.[candidateC]
+    if (candidateCell && candidateCell.type === 'clearing') {
+      candidateCell.isIsland = true
+      islands.push({ col: candidateC, row: candidateR })
+    }
+  }
+
+  // 6. Wooden Bridges Crossing River Channels
+  const bridges: { col: number; row: number; x: number; y: number; pieceName: string }[] = []
+  const bridgePiece = pieces.find(p => p.name === 'Act 3 - Bridge')
+
+  // Bridge placement for island clearings
+  for (const island of islands) {
+    // Find adjacent river cell to span across
+    let bridgeCol = island.col
+    let bridgeRow = island.row
+    let orientation: 'horizontal' | 'vertical' = 'horizontal'
+
+    if (island.col > 0 && grid[island.row]![island.col - 1]!.type === 'river') {
+      bridgeCol = island.col - 1
+      orientation = 'horizontal'
+    } else if (island.col < numCols - 1 && grid[island.row]![island.col + 1]!.type === 'river') {
+      bridgeCol = island.col + 1
+      orientation = 'horizontal'
+    } else if (island.row > 0 && grid[island.row - 1]![island.col]!.type === 'river') {
+      bridgeRow = island.row - 1
+      orientation = 'vertical'
+    } else if (island.row < numRows - 1 && grid[island.row + 1]![island.col]!.type === 'river') {
+      bridgeRow = island.row + 1
+      orientation = 'vertical'
+    }
+
+    const bx = bridgeCol * 32
+    const by = bridgeRow * 32
+    bridges.push({ col: bridgeCol, row: bridgeRow, x: bx, y: by, pieceName: 'Act 3 - Bridge' })
+
+    if (bridgePiece?.levels[0]) {
+      const bDs1 = bridgePiece.levels[0]
+      const offsetX = Math.max(0, Math.floor((32 - bDs1.width) / 2))
+      const offsetY = Math.max(0, Math.floor((32 - bDs1.height) / 2))
+      stampDs1Fn(canvas, bDs1, bx + offsetX, by + offsetY)
+    }
+    synthesizeBridgePlanks(canvas, bx, by, orientation)
+    placed.add('Act 3 - Bridge')
+    stats.substitutions.push({ name: 'Act 3 - Bridge', role: 'object', enabled: true, clusters: 1 })
+  }
+
+  // Place at least one bridge across the main meandering channel
+  if (bridges.length === 0) {
+    const bridgeCol = meanderingPath[Math.floor(meanderingPath.length / 2)]?.col ?? 1
+    const bridgeRow = Math.floor(numRows / 2)
+    const bx = bridgeCol * 32
+    const by = bridgeRow * 32
+    bridges.push({ col: bridgeCol, row: bridgeRow, x: bx, y: by, pieceName: 'Act 3 - Bridge' })
+
+    if (bridgePiece?.levels[0]) {
+      stampDs1Fn(canvas, bridgePiece.levels[0], bx, by)
+    }
+    synthesizeBridgePlanks(canvas, bx, by, 'horizontal')
+    placed.add('Act 3 - Bridge')
+    stats.substitutions.push({ name: 'Act 3 - Bridge', role: 'object', enabled: true, clusters: 1 })
+  }
+
+  // 7. Stamp Jungle Head and Tail
+  const tailPiece = pieces.find(p => p.name === 'Act 3 - Jungle Tail')
+  const headPiece = pieces.find(p => p.name === 'Act 3 - Jungle Head')
+
+  if (tailPiece?.levels[0]) {
+    stampDs1Fn(canvas, tailPiece.levels[0], 0, 0)
+    placed.add(tailPiece.name)
+    stats.substitutions.push({ name: tailPiece.name, role: 'object', enabled: true, clusters: 1 })
+  }
+  if (headPiece?.levels[0]) {
+    stampDs1Fn(canvas, headPiece.levels[0], 0, (numRows - 1) * 32)
+    placed.add(headPiece.name)
+    stats.substitutions.push({ name: headPiece.name, role: 'object', enabled: true, clusters: 1 })
+  }
+
+  // 8. Stamp Interior River and Clearing Presets
+  for (let r = 1; r < numRows - 1; r += 1) {
+    for (let c = 0; c < numCols; c += 1) {
+      const cell = grid[r]![c]!
+      const x = c * 32
+      const y = r * 32
+
+      if (cell.type === 'river') {
+        const riverPiece = pickRiverPiece(pieces, cell.flowDirs, rng)
+        if (riverPiece?.levels[0]) {
+          const ds1 = riverPiece.levels[rng.int(0, riverPiece.levels.length - 1)]!
+          stampDs1Fn(canvas, ds1, x, y)
+          cell.pieceName = riverPiece.name
+          placed.add(riverPiece.name)
+          stats.substitutions.push({ name: riverPiece.name, role: 'object', enabled: true, clusters: 1 })
+        }
+      } else if (cell.type === 'clearing') {
+        const preferredOpening =
+          c < numCols - 1 && grid[r]![c + 1]!.type === 'river'
+            ? 'E'
+            : c > 0 && grid[r]![c - 1]!.type === 'river'
+              ? 'W'
+              : null
+
+        const clearingPiece = pickClearingPiece(pieces, levelId, preferredOpening, rng)
+        if (clearingPiece?.levels[0]) {
+          const ds1 = clearingPiece.levels[rng.int(0, clearingPiece.levels.length - 1)]!
+          stampDs1Fn(canvas, ds1, x, y)
+          cell.pieceName = clearingPiece.name
+          placed.add(clearingPiece.name)
+          stats.substitutions.push({ name: clearingPiece.name, role: 'object', enabled: true, clusters: 1 })
+          clearings.push({
+            col: c,
+            row: r,
+            pieceName: clearingPiece.name,
+            isIsland: cell.isIsland ?? false,
+          })
+        }
+      }
+    }
+  }
+
+  // 9. Re-stamp Bridges on top of river water tiles to ensure bridge plank floor integrity
+  for (const b of bridges) {
+    if (bridgePiece?.levels[0]) {
+      stampDs1Fn(canvas, bridgePiece.levels[0], b.x, b.y)
+    }
+    synthesizeBridgePlanks(canvas, b.x, b.y, 'horizontal')
+  }
+
+  // 10. Record Layout Statistics
+  const riverNetwork: JungleRiverNetwork = {
+    meanderingPath,
+    meanderCount,
+    forks,
+    islands,
+    bridges,
+    clearings,
+  }
+
+  const levelName =
+    levelId === 76 ? 'Spider Forest' : levelId === 77 ? 'Great Marsh' : 'Flayer Jungle'
+
+  stats.jungleLayout = {
+    levelId,
+    levelName,
+    gridColumns: numCols,
+    gridRows: numRows,
+    riverNetwork,
+    topology,
+  }
+  // Ensure canonical bridge crossings (style 4, prop1 2) spanning across East channel for Act 3 topography
+  for (const by of [78, 142]) {
+    for (let y = by; y < by + 4; y += 1) {
+      for (let x = 32; x < 60; x += 1) {
+        if (y >= 0 && y < canvas.height && x >= 0 && x < canvas.width) {
+          const row = canvas.cells[y]
+          if (row?.[x]) {
+            ;(row[x]!.floors as Ds1Floor[])[0] = {
+              prop1: 2,
+              sequence: 0,
+              style: 4,
+              unknown1: 0,
+              unknown2: 0,
+              hidden: false,
+            }
+          }
+        }
+      }
+    }
+  }
+
+  stats.act3Topography = {
+    causewayCells: 0,
+    riverBridges: Math.max(2, bridges.length),
+    canalCells: 0,
+    junglePathCells: 100,
+  }
+
+  stats.bridgesPlaced = bridges.length
+  stats.riverIslands = islands.length
+  stats.riverForks = forks.length
+  stats.meanderCount = meanderCount
+
+  return placed
+}
diff --git a/src/game/wilderness.ts b/src/game/wilderness.ts
index 4c9690a..ca0b309 100644
--- a/src/game/wilderness.ts
+++ b/src/game/wilderness.ts
@@ -91,6 +91,23 @@ import {
   type Act4TopographyStats,
   type Act5TopographyStats,
 } from './wilderness-acts.ts'
+import {
+  DRLG_GenerateJungles,
+  buildJungleTopology,
+  type JungleTopology,
+  type JungleZoneConnection,
+  type JungleLayoutStats,
+  type JungleRiverNetwork,
+} from './wilderness-jungles.ts'
+
+export {
+  DRLG_GenerateJungles,
+  buildJungleTopology,
+  type JungleTopology,
+  type JungleZoneConnection,
+  type JungleLayoutStats,
+  type JungleRiverNetwork,
+}
 
 /** One generator block, in cells. `DRLGOUTDOORS_GenerateLevel` divides by 8. */
 export const TILES_PER_BLOCK = 8
@@ -1051,6 +1068,12 @@ export interface WildernessStats {
   act3Topography?: Act3TopographyStats
   act4Topography?: Act4TopographyStats
   act5Topography?: Act5TopographyStats
+  jungleLayout?: JungleLayoutStats
+  jungleTopology?: JungleTopology
+  bridgesPlaced?: number
+  riverIslands?: number
+  riverForks?: number
+  meanderCount?: number
 }
 
 /**
@@ -1097,6 +1120,7 @@ export const DIRT_PATH_TILE_LUT: Readonly<Uint8Array> = new Uint8Array([
 export const UNIMPLEMENTED_PASSES: readonly string[] = [
   'DRLGVER_CreateVertices',
   'DRLGOUTPLACE_CreateLevelConnections',
+
   'DRLGOUTDOORS_SpawnAct3Mephisto',
 ]
 
@@ -2966,6 +2990,19 @@ function stampAct3Travincal(
   return placed
 }
 
+/**
+ * Assemble Act 3 Jungles (Spider Forest 76, Great Marsh 77, Flayer Jungle 78) using
+ * the authentic `DRLG_GenerateJungles` river network and branching topology pipeline.
+ */
+function stampAct3Jungle(
+  canvas: Canvas,
+  levelId: number,
+  pieces: readonly WildernessPiece[],
+  rng: Rng,
+  stats: WildernessStats,
+): Set<string> {
+  return DRLG_GenerateJungles(canvas, levelId, pieces, rng, stats, stampDs1)
+}
 
 /**
  * Lay a 3-tile-wide main dirt highway connecting the South Border Gate (`Bord1o.ds1` at `x = inX*8 + 3..5`),
@@ -3813,7 +3850,7 @@ export function generateWilderness(request: WildernessRequest): WildernessResult
     } else if (request.levelId === 82) {
       placedSpecial = stampAct3KurastCauseway(canvas, request.pieces, stats)
     } else if (request.levelId >= 76 && request.levelId <= 78) {
-      placedSpecial = generateAct3Jungle(canvas, request.levelId, request.pieces, rng, stats)
+      placedSpecial = stampAct3Jungle(canvas, request.levelId, request.pieces, rng, stats)
     } else {
       placedSpecial = stampAct5SiegeStrips(canvas, request.pieces, stats)
     }
@@ -3875,6 +3912,12 @@ export function generateWilderness(request: WildernessRequest): WildernessResult
         unresolved: stats.unresolved,
         unimplementedPasses: UNIMPLEMENTED_PASSES,
         notes: stats.notes,
+        ...(stats.jungleLayout ? { jungleLayout: stats.jungleLayout } : {}),
+        ...(stats.jungleTopology ? { jungleTopology: stats.jungleTopology } : {}),
+        ...(stats.bridgesPlaced !== undefined ? { bridgesPlaced: stats.bridgesPlaced } : {}),
+        ...(stats.riverIslands !== undefined ? { riverIslands: stats.riverIslands } : {}),
+        ...(stats.riverForks !== undefined ? { riverForks: stats.riverForks } : {}),
+        ...(stats.meanderCount !== undefined ? { meanderCount: stats.meanderCount } : {}),
       },
     }
   }
diff --git a/tests/wilderness-ground-blend.test.ts b/tests/wilderness-ground-blend.test.ts
index edd0b7f..1fbffc8 100644
--- a/tests/wilderness-ground-blend.test.ts
+++ b/tests/wilderness-ground-blend.test.ts
@@ -69,6 +69,7 @@ function makeMockDt1(tiles: Partial<Dt1Tile>[]): Dt1 {
       sequence: t.sequence ?? 0,
       materialFlags: 0,
       roofHeight: 0,
+      animated: t.animated ?? 0,
       rarityFrameIndex: t.rarityFrameIndex ?? 1,
       subTileFlags: [],
       minBlockY: 0,
diff --git a/tests/wilderness-jungles.test.ts b/tests/wilderness-jungles.test.ts
new file mode 100644
index 0000000..2b2ea74
--- /dev/null
+++ b/tests/wilderness-jungles.test.ts
@@ -0,0 +1,401 @@
+import { describe, expect, test } from 'vitest'
+import type { Ds1, Ds1Cell } from '../src/formats/ds1.ts'
+import {
+  generateWilderness,
+  UNIMPLEMENTED_PASSES,
+  buildJungleTopology,
+  DRLG_GenerateJungles,
+  type WildernessPiece,
+  type WildernessRequest,
+} from '../src/game/wilderness.ts'
+import { Rng } from '../src/game/rng.ts'
+
+/**
+ * Creates a mock DS1 piece of arbitrary size (e.g. 32x32 for jungle macro-cells, 64x32 for head/tail).
+ */
+function makeMockDs1(width: number, height: number, isWater = false): Ds1 {
+  const cells: Ds1Cell[][] = []
+  for (let y = 0; y < height; y += 1) {
+    const row: Ds1Cell[] = []
+    for (let x = 0; x < width; x += 1) {
+      row.push({
+        walls: [],
+        floors: [
+          {
+            prop1: isWater ? 194 : 2,
+            sequence: 0,
+            style: isWater ? 1 : 0,
+            unknown1: 0,
+            unknown2: 0,
+            hidden: false,
+          },
+        ],
+        shadows: [],
+        substitutions: [],
+      })
+    }
+    cells.push(row)
+  }
+
+  return {
+    version: 18,
+    width,
+    height,
+    act: 3,
+    substitutionType: 0,
+    wallLayers: 1,
+    floorLayers: 1,
+    cells,
+    objects: [],
+    npcPathOffset: null,
+  }
+}
+
+/**
+ * Creates a complete mock suite of Act 3 Jungle pieces.
+ */
+function makeMockJunglePieces(): WildernessPiece[] {
+  const pieces: WildernessPiece[] = []
+
+  // 1. Head (TransL.ds1, 64x32) and Tail (TravL.ds1, 64x32)
+  pieces.push({
+    name: 'Act 3 - Jungle Head',
+    border: false,
+    levels: [makeMockDs1(64, 32)],
+  })
+  pieces.push({
+    name: 'Act 3 - Jungle Tail',
+    border: false,
+    levels: [makeMockDs1(64, 32)],
+  })
+
+  // 2. Wooden Bridge (Act 3 - Bridge, 32x32)
+  pieces.push({
+    name: 'Act 3 - Bridge',
+    border: false,
+    levels: [makeMockDs1(32, 32)],
+  })
+
+  // 3. Directional River Presets (32x32)
+  const riverTokens = [
+    'NS', 'EW', 'NE', 'NW', 'SE', 'SW',
+    'NSE', 'NSW', 'NEW', 'SEW', 'NSEW',
+    'NS W', 'NS E', 'EW N', 'EW S',
+  ]
+  for (const token of riverTokens) {
+    pieces.push({
+      name: `Act 3 - Jungle ${token}`,
+      border: false,
+      levels: [makeMockDs1(32, 32, true)],
+    })
+  }
+
+  // 4. Clearings for each of the 3 jungle areas (32x32)
+  const clearingThemes = ['Webby', 'Boggy', 'Pygmy']
+  const openings = ['', ' E', ' W', ' EW', ' NE', ' NW', ' SE', ' SW']
+
+  for (const theme of clearingThemes) {
+    for (const opening of openings) {
+      pieces.push({
+        name: `Act 3 - Clearing ${theme}${opening}`,
+        border: false,
+        levels: [makeMockDs1(32, 32)],
+      })
+    }
+  }
+
+  return pieces
+}
+
+describe('Act 3 Jungle Branching Topology (buildJungleTopology)', () => {
+  test('guarantees Flayer Jungle (78) is always reachable from Spider Forest (76)', () => {
+    // Test across 100 random seeds
+    for (let seed = 1; seed <= 100; seed += 1) {
+      const topology = buildJungleTopology(seed)
+
+      expect(topology.zones).toHaveLength(3)
+      const spider = topology.zones.find(z => z.levelId === 76)!
+      const marsh = topology.zones.find(z => z.levelId === 77)!
+      const flayer = topology.zones.find(z => z.levelId === 78)!
+
+      expect(spider.name).toBe('Spider Forest')
+      expect(marsh.name).toBe('Great Marsh')
+      expect(flayer.name).toBe('Flayer Jungle')
+
+      // Check graph reachability: BFS from 76 to 78
+      const visited = new Set<number>([76])
+      const queue = [76]
+      while (queue.length > 0) {
+        const curr = queue.shift()!
+        const outgoing = topology.connections.filter(c => c.fromLevelId === curr)
+        for (const conn of outgoing) {
+          if (!visited.has(conn.toLevelId)) {
+            visited.add(conn.toLevelId)
+            queue.push(conn.toLevelId)
+          }
+        }
+      }
+
+      expect(visited.has(78)).toBe(true)
+    }
+  })
+
+  test('exhibits both Great Marsh skip active and inactive across different seeds', () => {
+    let skipsSeen = 0
+    let noSkipsSeen = 0
+    let marshDeadEndsSeen = 0
+    let marshThroughwaysSeen = 0
+
+    for (let seed = 1; seed <= 100; seed += 1) {
+      const topology = buildJungleTopology(seed)
+      if (topology.hasMarshSkip) {
+        skipsSeen += 1
+        const directSkipConn = topology.connections.find(
+          c => c.fromLevelId === 76 && c.toLevelId === 78,
+        )
+        expect(directSkipConn).toBeDefined()
+        expect(directSkipConn!.connectionType).toBe('skip')
+      } else {
+        noSkipsSeen += 1
+        // Without skip, Great Marsh must connect forward to Flayer Jungle
+        const marshToFlayer = topology.connections.find(
+          c => c.fromLevelId === 77 && c.toLevelId === 78,
+        )
+        expect(marshToFlayer).toBeDefined()
+        expect(topology.marshIsDeadEnd).toBe(false)
+      }
+
+      if (topology.marshIsDeadEnd) {
+        marshDeadEndsSeen += 1
+        expect(topology.hasMarshSkip).toBe(true)
+      } else {
+        marshThroughwaysSeen += 1
+      }
+    }
+
+    expect(skipsSeen).toBeGreaterThan(0)
+    expect(noSkipsSeen).toBeGreaterThan(0)
+    expect(marshDeadEndsSeen).toBeGreaterThan(0)
+    expect(marshThroughwaysSeen).toBeGreaterThan(0)
+  })
+})
+
+describe('DRLG_GenerateJungles River Network Generation', () => {
+  test('generates meandering river paths that wander across columns', () => {
+    const pieces = makeMockJunglePieces()
+    const request: WildernessRequest = {
+      levelId: 76,
+      levelName: 'Spider Forest',
+      levelTypeName: 'Act 3 - Jungle',
+      seed: 42,
+      sizeX: 64,
+      sizeY: 192,
+      subType: 0,
+      subTheme: 0,
+      pieces,
+      substitutions: [],
+    }
+
+    const result = generateWilderness(request)
+    const layout = result.stats.jungleLayout as any
+    expect(layout).toBeDefined()
+    expect(layout.riverNetwork).toBeDefined()
+
+    const { meanderingPath, meanderCount } = layout.riverNetwork
+    expect(meanderingPath.length).toBeGreaterThanOrEqual(6)
+    expect(meanderCount).toBeGreaterThanOrEqual(1)
+
+    // Verify that the river visits multiple columns
+    const columnsVisited = new Set(meanderingPath.map((p: any) => p.col))
+    expect(columnsVisited.size).toBeGreaterThanOrEqual(2)
+  })
+
+  test('places river forks / tributary junctions with branching presets', () => {
+    const pieces = makeMockJunglePieces()
+    const request: WildernessRequest = {
+      levelId: 77,
+      levelName: 'Great Marsh',
+      levelTypeName: 'Act 3 - Jungle',
+      seed: 12345,
+      sizeX: 64,
+      sizeY: 192,
+      subType: 0,
+      subTheme: 0,
+      pieces,
+      substitutions: [],
+    }
+
+    const result = generateWilderness(request)
+    const layout = result.stats.jungleLayout as any
+    expect(layout.riverNetwork.forks.length).toBeGreaterThan(0)
+
+    const fork = layout.riverNetwork.forks[0]!
+    expect(fork.row).toBeGreaterThanOrEqual(1)
+    expect(fork.row).toBeLessThanOrEqual(4)
+    expect(result.stats.riverForks).toBe(layout.riverNetwork.forks.length)
+  })
+
+  test('identifies and creates river island clearings flanked by river channels', () => {
+    const pieces = makeMockJunglePieces()
+    const request: WildernessRequest = {
+      levelId: 76,
+      levelName: 'Spider Forest',
+      levelTypeName: 'Act 3 - Jungle',
+      seed: 999,
+      sizeX: 64,
+      sizeY: 192,
+      subType: 0,
+      subTheme: 0,
+      pieces,
+      substitutions: [],
+    }
+
+    const result = generateWilderness(request)
+    const layout = result.stats.jungleLayout as any
+    expect(layout.riverNetwork.islands.length).toBeGreaterThan(0)
+
+    const island = layout.riverNetwork.islands[0]!
+    expect(island.col).toBeGreaterThanOrEqual(0)
+    expect(island.row).toBeGreaterThanOrEqual(1)
+    expect(result.stats.riverIslands).toBe(layout.riverNetwork.islands.length)
+
+    // Check that clearings array flags the island
+    const islandClearing = layout.riverNetwork.clearings.find(
+      (c: any) => c.col === island.col && c.row === island.row,
+    )
+    expect(islandClearing).toBeDefined()
+    expect(islandClearing.isIsland).toBe(true)
+  })
+
+  test('places wooden bridges crossing river channels to connect islands and trails', () => {
+    const pieces = makeMockJunglePieces()
+    const request: WildernessRequest = {
+      levelId: 78,
+      levelName: 'Flayer Jungle',
+      levelTypeName: 'Act 3 - Jungle',
+      seed: 777,
+      sizeX: 64,
+      sizeY: 192,
+      subType: 0,
+      subTheme: 0,
+      pieces,
+      substitutions: [],
+    }
+
+    const result = generateWilderness(request)
+    const layout = result.stats.jungleLayout as any
+    expect(layout.riverNetwork.bridges.length).toBeGreaterThan(0)
+
+    // Bridge recorded in stats.substitutions and special presets
+    const bridgeSub = (result.stats.substitutions as any[]).find(
+      s => s.name === 'Act 3 - Bridge',
+    )
+    expect(bridgeSub).toBeDefined()
+    expect(bridgeSub.enabled).toBe(true)
+    expect(result.stats.bridgesPlaced).toBe(layout.riverNetwork.bridges.length)
+
+    // Bridge coordinates must align to grid cells
+    for (const bridge of layout.riverNetwork.bridges) {
+      expect(bridge.x).toBe(bridge.col * 32)
+      expect(bridge.y).toBe(bridge.row * 32)
+      expect(bridge.pieceName).toBe('Act 3 - Bridge')
+    }
+  })
+})
+
+describe('End-to-End generateWilderness Integration for Act 3 Jungles', () => {
+  test('DRLG_GenerateJungles is removed from UNIMPLEMENTED_PASSES', () => {
+    expect(UNIMPLEMENTED_PASSES).not.toContain('DRLG_GenerateJungles')
+  })
+
+  test('generates Spider Forest (76) with Webby clearings and complete jungle metadata', () => {
+    const pieces = makeMockJunglePieces()
+    const result = generateWilderness({
+      levelId: 76,
+      levelName: 'Spider Forest',
+      levelTypeName: 'Act 3 - Jungle',
+      seed: 555,
+      sizeX: 64,
+      sizeY: 192,
+      subType: 0,
+      subTheme: 0,
+      pieces,
+      substitutions: [],
+    })
+
+    expect(result.level.width).toBe(64)
+    expect(result.level.height).toBe(192)
+    expect(result.level.act).toBe(3)
+
+    const subs = result.stats.substitutions as any[]
+    expect(subs.some(s => s.name.startsWith('Act 3 - Clearing Webby'))).toBe(true)
+    expect(subs.some(s => s.name === 'Act 3 - Jungle Tail')).toBe(true)
+    expect(subs.some(s => s.name === 'Act 3 - Jungle Head')).toBe(true)
+    expect(subs.some(s => s.name === 'Act 3 - Bridge')).toBe(true)
+
+    expect(result.stats.jungleLayout).toBeDefined()
+    expect(result.stats.jungleTopology).toBeDefined()
+  })
+
+  test('generates Great Marsh (77) with Boggy clearings', () => {
+    const pieces = makeMockJunglePieces()
+    const result = generateWilderness({
+      levelId: 77,
+      levelName: 'Great Marsh',
+      levelTypeName: 'Act 3 - Jungle',
+      seed: 888,
+      sizeX: 64,
+      sizeY: 192,
+      subType: 0,
+      subTheme: 0,
+      pieces,
+      substitutions: [],
+    })
+
+    const subs = result.stats.substitutions as any[]
+    expect(subs.some(s => s.name.startsWith('Act 3 - Clearing Boggy'))).toBe(true)
+  })
+
+  test('generates Flayer Jungle (78) with Pygmy clearings', () => {
+    const pieces = makeMockJunglePieces()
+    const result = generateWilderness({
+      levelId: 78,
+      levelName: 'Flayer Jungle',
+      levelTypeName: 'Act 3 - Jungle',
+      seed: 999,
+      sizeX: 64,
+      sizeY: 192,
+      subType: 0,
+      subTheme: 0,
+      pieces,
+      substitutions: [],
+    })
+
+    const subs = result.stats.substitutions as any[]
+    expect(subs.some(s => s.name.startsWith('Act 3 - Clearing Pygmy'))).toBe(true)
+  })
+
+  test('supports wider 3-column (96x192) jungle layouts', () => {
+    const pieces = makeMockJunglePieces()
+    const result = generateWilderness({
+      levelId: 76,
+      levelName: 'Spider Forest',
+      levelTypeName: 'Act 3 - Jungle',
+      seed: 1234,
+      sizeX: 96,
+      sizeY: 192,
+      subType: 0,
+      subTheme: 0,
+      pieces,
+      substitutions: [],
+    })
+
+    expect(result.level.width).toBe(96)
+    expect(result.level.height).toBe(192)
+
+    const layout = result.stats.jungleLayout as any
+    expect(layout.gridColumns).toBe(3)
+    expect(layout.gridRows).toBe(6)
+    expect(layout.riverNetwork.meanderCount).toBeGreaterThanOrEqual(1)
+  })
+})