diff --git a/IWantToHeal-Thor-v1.1.29.apk b/IWantToHeal-Thor-v1.1.29.apk
new file mode 100644
index 0000000..8f2e908
Binary files /dev/null and b/IWantToHeal-Thor-v1.1.29.apk differ
diff --git a/android/app/build.gradle b/android/app/build.gradle
index f45e7dc..648cab9 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -7,8 +7,8 @@ android {
         applicationId "com.warren.iwanttoheal"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 108
-        versionName "1.1.28"
+        versionCode 109
+        versionName "1.1.29"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         aaptOptions {
              // Files and dirs to omit from the packaged assets dir, modified to accommodate modern web apps.
diff --git a/src/modes/iwt2/IWantToHeal2App.tsx b/src/modes/iwt2/IWantToHeal2App.tsx
index 0872c49..70205c0 100644
--- a/src/modes/iwt2/IWantToHeal2App.tsx
+++ b/src/modes/iwt2/IWantToHeal2App.tsx
@@ -46,6 +46,11 @@ import {
   type Iwt2RoguelikeSelfBuffId,
   type Iwt2RoguelikeVariant,
 } from './content/roguelike'
+import {
+  createIwt2PveRoguelikeBossPair,
+  createUniformIwt2RoguelikeBossPair,
+  IWT2_PVE_ROGUELIKE_WEIGHTED_BOSS_PROGRESSION_ENABLED,
+} from './content/roguelikeBossProgression'
 
 type Iwt2Screen =
   | 'menu'
@@ -522,7 +527,7 @@ function createRoguelikeRun(
   contentType: Iwt2RoguelikeContentType,
 ): Iwt2RoguelikeRunState {
   return {
-    bossIds: createRandomRoguelikeBossPair(),
+    bossIds: createRoguelikeBossPair(variant, 1),
     buffs: [],
     contentType,
     debuffs: [],
@@ -590,15 +595,17 @@ function applyRoguelikeChoice(
   return {
     ...run,
     ...nextBase,
-    bossIds: createRandomRoguelikeBossPair(),
+    bossIds: createRoguelikeBossPair(run.variant, run.stage + 1),
     ...buildRoguelikeChoices(save, run.variant),
     stage: run.stage + 1,
   }
 }
 
-function createRandomRoguelikeBossPair(): Iwt2BossId[] {
-  const pool = Object.keys(IWT2_BOSS_METADATA) as Iwt2BossId[]
-  return chooseRunChoices(pool, 2)
+function createRoguelikeBossPair(variant: Iwt2RoguelikeVariant, stage: number): Iwt2BossId[] {
+  if (variant === 'pve' && IWT2_PVE_ROGUELIKE_WEIGHTED_BOSS_PROGRESSION_ENABLED) {
+    return createIwt2PveRoguelikeBossPair(stage)
+  }
+  return createUniformIwt2RoguelikeBossPair()
 }
 
 function chooseRunChoices<T>(items: readonly T[], count: number): T[] {
diff --git a/src/modes/iwt2/content/roguelikeBossProgression.ts b/src/modes/iwt2/content/roguelikeBossProgression.ts
new file mode 100644
index 0000000..c4cd1b5
--- /dev/null
+++ b/src/modes/iwt2/content/roguelikeBossProgression.ts
@@ -0,0 +1,160 @@
+import { IWT2_BOSS_METADATA, type Iwt2BossId } from './bosses'
+
+export const IWT2_PVE_ROGUELIKE_WEIGHTED_BOSS_PROGRESSION_ENABLED = true
+
+type Iwt2RoguelikeBossTier = 'early' | 'mid' | 'late'
+
+type TierWeight = {
+  tier: Iwt2RoguelikeBossTier
+  weight: number
+}
+
+const IWT2_ROGUELIKE_BOSS_TIERS: Record<Iwt2RoguelikeBossTier, readonly Iwt2BossId[]> = {
+  early: ['bulldrome', 'yian-kut-ku', 'great-jaggi', 'rathian', 'stormcoil-wyrm'],
+  mid: ['khezu', 'barroth', 'tobi-kadachi', 'ember-mantis-duelist', 'crystal-bat-matriarch', 'hollowcrown-revenant'],
+  late: ['rimebastion', 'cinderback-ricochet', 'obsidian-ram-golem', 'venom-orchid-hydra', 'sandglass-scorpion'],
+}
+
+const IWT2_ROGUELIKE_BOSS_THREAT: Record<Iwt2RoguelikeBossTier, number> = {
+  early: 1,
+  mid: 2,
+  late: 3,
+}
+
+const IWT2_ROGUELIKE_BOSS_TIER_BY_ID: Record<Iwt2BossId, Iwt2RoguelikeBossTier> = {
+  bulldrome: 'early',
+  'yian-kut-ku': 'early',
+  'great-jaggi': 'early',
+  rathian: 'early',
+  'stormcoil-wyrm': 'early',
+  khezu: 'mid',
+  barroth: 'mid',
+  'tobi-kadachi': 'mid',
+  'ember-mantis-duelist': 'mid',
+  'crystal-bat-matriarch': 'mid',
+  'hollowcrown-revenant': 'mid',
+  rimebastion: 'late',
+  'cinderback-ricochet': 'late',
+  'obsidian-ram-golem': 'late',
+  'venom-orchid-hydra': 'late',
+  'sandglass-scorpion': 'late',
+}
+
+export function createIwt2PveRoguelikeBossPair(
+  stage: number,
+  random: () => number = Math.random,
+): Iwt2BossId[] {
+  const choices: Iwt2BossId[] = []
+  const maxThreat = maxThreatForStage(stage)
+
+  while (choices.length < 2) {
+    const next = chooseWeightedBossForStage(stage, choices, maxThreat, random)
+    if (!next) break
+    choices.push(next)
+  }
+
+  return choices.length === 2
+    ? choices
+    : createUniformIwt2RoguelikeBossPair(random)
+}
+
+export function createUniformIwt2RoguelikeBossPair(random: () => number = Math.random): Iwt2BossId[] {
+  const pool = Object.keys(IWT2_BOSS_METADATA) as Iwt2BossId[]
+  const choices: Iwt2BossId[] = []
+  while (pool.length > 0 && choices.length < 2) {
+    const index = randomIndex(pool.length, random)
+    const [choice] = pool.splice(index, 1)
+    if (choice) choices.push(choice)
+  }
+  return choices
+}
+
+function chooseWeightedBossForStage(
+  stage: number,
+  selected: readonly Iwt2BossId[],
+  maxThreat: number,
+  random: () => number,
+): Iwt2BossId | undefined {
+  const selectedSet = new Set(selected)
+  const selectedThreat = selected.reduce((total, bossId) => total + threatForBoss(bossId), 0)
+  const weightedTiers = tierWeightsForStage(stage)
+    .map((entry) => ({
+      ...entry,
+      bosses: IWT2_ROGUELIKE_BOSS_TIERS[entry.tier].filter((bossId) => (
+        !selectedSet.has(bossId) && selectedThreat + threatForBoss(bossId) <= maxThreat
+      )),
+    }))
+    .filter((entry) => entry.weight > 0 && entry.bosses.length > 0)
+
+  const totalWeight = weightedTiers.reduce((total, entry) => total + entry.weight, 0)
+  if (totalWeight <= 0) return undefined
+
+  let roll = safeRandom(random) * totalWeight
+  for (const entry of weightedTiers) {
+    roll -= entry.weight
+    if (roll <= 0) {
+      return entry.bosses[randomIndex(entry.bosses.length, random)]
+    }
+  }
+
+  const lastEntry = weightedTiers[weightedTiers.length - 1]
+  return lastEntry?.bosses[randomIndex(lastEntry.bosses.length, random)]
+}
+
+function tierWeightsForStage(stage: number): TierWeight[] {
+  const safeStage = Math.max(1, Math.floor(stage))
+  if (safeStage <= 2) {
+    return [
+      { tier: 'early', weight: 85 },
+      { tier: 'mid', weight: 15 },
+      { tier: 'late', weight: 0 },
+    ]
+  }
+  if (safeStage === 3) {
+    return [
+      { tier: 'early', weight: 60 },
+      { tier: 'mid', weight: 35 },
+      { tier: 'late', weight: 5 },
+    ]
+  }
+  if (safeStage <= 5) {
+    return [
+      { tier: 'early', weight: 25 },
+      { tier: 'mid', weight: 60 },
+      { tier: 'late', weight: 15 },
+    ]
+  }
+  if (safeStage === 6) {
+    return [
+      { tier: 'early', weight: 10 },
+      { tier: 'mid', weight: 50 },
+      { tier: 'late', weight: 40 },
+    ]
+  }
+  return [
+    { tier: 'early', weight: 5 },
+    { tier: 'mid', weight: 30 },
+    { tier: 'late', weight: 65 },
+  ]
+}
+
+function maxThreatForStage(stage: number): number {
+  const safeStage = Math.max(1, Math.floor(stage))
+  if (safeStage <= 2) return 3
+  if (safeStage === 3) return 4
+  if (safeStage <= 5) return 5
+  return 6
+}
+
+function threatForBoss(bossId: Iwt2BossId): number {
+  return IWT2_ROGUELIKE_BOSS_THREAT[IWT2_ROGUELIKE_BOSS_TIER_BY_ID[bossId]]
+}
+
+function randomIndex(length: number, random: () => number): number {
+  return Math.min(length - 1, Math.floor(safeRandom(random) * length))
+}
+
+function safeRandom(random: () => number): number {
+  const value = random()
+  return Number.isFinite(value) ? Math.min(0.999999999, Math.max(0, value)) : 0
+}