diff --git a/INTEGRATION_CHECKLIST.md b/INTEGRATION_CHECKLIST.md
new file mode 100644
index 000000000..bd11b775b
--- /dev/null
+++ b/INTEGRATION_CHECKLIST.md
@@ -0,0 +1,291 @@
+# 📋 **INTEGRATION CHECKLIST - What to Add to FINAL_GAME_CONTENT_IN_OUT.md**
+
+## ✅ **ALREADY IN FINAL_GAME_CONTENT_IN_OUT.md:**
+- Basic story overview
+- 20 Biomes (updated from 18!)
+- Town system (27 towns)
+- Vape liquids (4 flavors)
+- Cryptids (Bigfoot, Leprechauns, Trolls)
+- Gnomes system
+- Twin Bond basics
+
+---
+
+## ❌ **MISSING - NEEDS TO BE ADDED:**
+
+### **1. MEMORY LOSS SYSTEM** ⭐⭐⭐ CRITICAL!
+**From:** MEMORY_LOSS_EXPANSION.md
+
+**Add to FINAL doc:**
+- ✅ Kai loses memory (head trauma)
+- ✅ Ana has partial amnesia (captivity trauma)
+- ✅ 50 Ana's belongings scattered across map
+- ✅ **HEARTBEAT PROXIMITY mechanic** (heart beats faster near items!)
+- ✅ Each item triggers FLASHBACK cutscene
+- ✅ Memory restoration = stat bonuses (+250 HP total!)
+- ✅ 50/50 = FULL memory restored, emotional breakdown!
+
+**Where to add:** New section after "STORY" section
+
+---
+
+### **2. DUAL PROTAGONIST SYSTEM** ⭐⭐⭐ CRITICAL!
+**From:** DUAL_PROTAGONIST_SYSTEM.md
+
+**Add to FINAL doc:**
+- ✅ Choose Kai OR Ana at game start
+- ✅ **Kai's Story:** Farming/Combat focus, zombie control
+- ✅ **Ana's Story:** Captivity/Escape, stealth/puzzles
+- ✅ Ana's playthrough = write 50 diary pages!
+- ✅ Ana's escape sequence (7 levels!)
+- ✅ Both perspectives = full story!
+- ✅ Same 4 endings, different POV
+
+**Where to add:** New section at top, before "STORY"
+
+---
+
+### **3. RAILWAY SYSTEM** ⭐⭐ HIGH PRIORITY!
+**From:** RAILWAY_SYSTEM.md
+
+**Add to FINAL doc:**
+- ✅ 27 train stations (pre-existing tracks!)
+- ✅ Restore stations (not build tracks!)
+- ✅ 5 trains to repair (Steam, Diesel, Electric, Cargo, Luxury)
+- ✅ Fast travel system (100-200g tickets)
+- ✅ Cargo trading between towns
+- ✅ Shotgun unlock in Chernobyl station!
+- ✅ "Reconnect Slovenia" master quest
+
+**Where to add:** New section in "GAME SYSTEMS"
+
+---
+
+### **4. GRONK RECRUITMENT QUEST** ⭐⭐⭐ CRITICAL!
+**From:** GRONK_RECRUITMENT_QUEST.md
+
+**Add to FINAL doc:**
+- ✅ Gronk NOT automatic - must find!
+- ✅ Quest chain "The Green Giant" (3 parts)
+- ✅ Day 10 trigger (mysterious sounds)
+- ✅ Track giant → Find camp → Recruit!
+- ✅ Gronk moves to barn
+- ✅ **UNLOCKS:** Vape Lab, 4 vape recipes
+- ✅ **UNLOCKS:** Grok NPC (3 days later)
+- ✅ **UNLOCKS:** Vape Shop, Dark Magic, The Gong!
+- ✅ Friendship levels (1-10)
+
+**Where to add:** Update existing "GRONK" section with quest details
+
+---
+
+### **5. FARMING = MEMORY RESTORATION** ⭐⭐ HIGH!
+**From:** FARMING_MEMORIES_BREEDING_CRAFTING.md
+
+**Add to FINAL doc:**
+- ✅ Both Kai & Ana confused (memory issues!)
+- ✅ Farming actions trigger flashbacks (5% chance!)
+- ✅ Planting → Dad's lesson
+- ✅ Watering → Ana's wisdom
+- ✅ Harvesting → Mom's love
+- ✅ Act 3+ → Both farm together = shared flashbacks!
+- ✅ Full memory restored via farming therapy
+
+**Where to add:** New subsection in "FARMING SYSTEM"
+
+---
+
+### **6. BREEDING SYSTEMS** ⭐⭐ HIGH!
+**From:** FARMING_MEMORIES_BREEDING_CRAFTING.md
+
+**Add to FINAL doc:**
+- ✅ **Mutated animals breeding** (Dinos, Dragons, Mermaids!)
+- ✅ **Wild animals auto-breed** (Ljubljana Zoo - 30 days!)
+- ✅ **Farm animals - monthly market!**
+  - Merchant arrives 1st of month
+  - Buy: Chickens, Cows, Pigs, Horses, etc.
+  - Prices: 300-25,000g!
+  - Exotic: Dinosaur Eggs, Unicorn Foals!
+- ✅ Auto-breeding mechanics (no player input for wild!)
+
+**Where to add:** New section "BREEDING SYSTEMS"
+
+---
+
+### **7. CRAFTING STATIONS (20 Total!)** ⭐⭐ HIGH!
+**From:** FARMING_MEMORIES_BREEDING_CRAFTING.md
+
+**Add to FINAL doc:**
+- ✅ Complete list of ALL 20 crafting stations
+  - Basic: Workbench, Furnace, Anvil, Stove, Alchemy
+  - Food: Mill, Brewery, Cheese Press, Smoker
+  - Production: Sawmill, Loom, Pottery
+  - Special: Vape Lab, Ritual Altar, Science Station, Gong
+  - Advanced: Enchanting, Blacksmithing, Genetic Lab
+- ✅ What each station crafts
+- ✅ Progression (Early → Mid → Late)
+
+**Where to add:** New section "CRAFTING STATIONS"
+
+---
+
+### **8. RANGED WEAPONS OVERHAUL** ⭐⭐⭐ CRITICAL!
+**From:** RANGED_WEAPONS_OVERHAUL.md
+
+**Add to FINAL doc:**
+- ✅ **GUNS REMOVED** (All except shotgun!)
+- ✅ **21 ARROW TYPES:**
+  - Basic: Wooden, Stone, Iron, Steel, Mythril
+  - Elemental: Fire, Ice, Lightning, Poison, Explosive, Shadow, Holy, Nature
+  - Special: Grappling, Teleport, Healing, Vampire, Tracking, Rope, Drill, Rainbow!
+- ✅ **8 BOW TYPES** (Primitive → Dragon Bow 5× damage!)
+- ✅ **SHOTGUN EXCEPTION:**
+  - ONLY in Chernobyl!
+  - Craftable shells (100g each!)
+  - Balanced (short range, slow reload)
+- ✅ Quiver system (50-250 arrows)
+- ✅ Quick-swap [Q] mechanic
+
+**Where to add:** Replace/update "WEAPONS" section
+
+---
+
+### **9. MUTANT ANIMALS (10 Complete!)** ⭐⭐⭐ CRITICAL!
+**From:** MUTANT_ANIMALS_COMPLETE.md
+
+**Add to FINAL doc:**
+- ✅ All 10 Chernobyl mutants with FULL details:
+  1. Mutant Wolf (50-500g drops)
+  2. Two-Headed Dog (60-800g, CAN BE TAMED!)
+  3. Giant Rat (10-300g, swarms)
+  4. Mutant Bear (200-5,000g, BOSS!)
+  5. Radioactive Boar (80-600g)
+  6. Glowing Deer (120-3,000g, peaceful!)
+  7. Mutant Crow (5-1,000g)
+  8. Radiation Spider (40-1,200g)
+  9. Mutant Fish (30-500g)
+  10. Radioactive Cow (DON'T KILL! Capture for 200g/day milk!)
+- ✅ Complete drop tables with rarities
+- ✅ Hunting strategies (Early/Mid/Late)
+- ✅ Total profitability (~7,000g per run!)
+- ✅ Top 10 most valuable drops
+
+**Where to add:** Expand "CHERNOBYL" biome section OR new "MUTANT CREATURES" section
+
+---
+
+## 📊 **INTEGRATION PRIORITY:**
+
+**MUST ADD (Critical for gameplay):**
+1. ⭐⭐⭐ Memory Loss System (core narrative!)
+2. ⭐⭐⭐ Dual Protagonist (game start choice!)
+3. ⭐⭐⭐ Gronk Quest (vape system unlock!)
+4. ⭐⭐⭐ Ranged Weapons (combat overhaul!)
+5. ⭐⭐⭐ Mutant Animals (Chernobyl content!)
+
+**SHOULD ADD (Important systems):**
+6. ⭐⭐ Railway System (fast travel!)
+7. ⭐⭐ Farming Memory Therapy
+8. ⭐⭐ Breeding Systems (3 types!)
+9. ⭐⭐ Crafting Stations (20 list!)
+
+---
+
+## 📝 **RECOMMENDED INTEGRATION STRUCTURE:**
+
+### **NEW SECTIONS TO ADD:**
+
+```markdown
+FINAL_GAME_CONTENT_IN_OUT.md
+
+[Existing content...]
+
+---
+
+## 🎮 **CHARACTER SELECTION** (NEW!)
+- Dual Protagonist System
+- Kai vs Ana
+
+---
+
+## 💔 **MEMORY LOSS & RESTORATION** (NEW!)
+- Both protagonists confused
+- 50 Ana's belongings
+- Heartbeat mechanic
+- Flashback system
+- Farming = memory therapy
+
+---
+
+## 🏹 **WEAPONS EXPANDED** (UPDATE EXISTING!)
+- 21 Arrow types
+- 8 Bow types
+- Shotgun (Chernobyl only!)
+- Guns removed
+
+---
+
+## 🧌 **GRONK RECRUITMENT** (UPDATE EXISTING!)
+- Quest chain details
+- Vape system unlock
+- Grok introduction
+
+---
+
+## 🚂 **RAILWAY SYSTEM** (NEW!)
+- 27 stations
+- 5 trains
+- Fast travel
+- Cargo trading
+
+---
+
+## 🐾 **BREEDING SYSTEMS** (NEW!)
+- Mutated breeding
+- Wild auto-breeding
+- Farm animal market
+
+---
+
+## 🔧 **CRAFTING STATIONS** (NEW!)
+- All 20 stations listed
+- What each crafts
+
+---
+
+## ☢️ **MUTANT CREATURES DETAILED** (EXPAND EXISTING!)
+- 10 Chernobyl mutants
+- Full drop tables
+- Hunting guide
+- Profitability
+
+---
+```
+
+---
+
+## ⚠️ **CURRENT STATUS:**
+
+**Files Created (Separate Docs):**
+✅ MEMORY_LOSS_EXPANSION.md  
+✅ DUAL_PROTAGONIST_SYSTEM.md  
+✅ RAILWAY_SYSTEM.md  
+✅ GRONK_RECRUITMENT_QUEST.md  
+✅ FARMING_MEMORIES_BREEDING_CRAFTING.md  
+✅ RANGED_WEAPONS_OVERHAUL.md  
+✅ MUTANT_ANIMALS_COMPLETE.md  
+
+**Integration Status:**
+❌ NOT YET ADDED to FINAL_GAME_CONTENT_IN_OUT.md
+
+---
+
+## ✅ **NEXT STEP:**
+
+**I will now integrate ALL 9 systems into FINAL_GAME_CONTENT_IN_OUT.md!**
+
+This will be a MASSIVE update consolidating everything into the master inventory!
+
+---
+
+**Ready to integrate?** 🚀