Resident Evil 9 Wiki: Item & Equipment Guide (Puzzle, Weapon, Boss)

Master Resident Evil 9 with our wiki: puzzle solutions, weapon locations, boss strategies, and achievement guide. Includes key item locations and upgrade paths.

## Key Takeaways
  • The **Stabilizer Stock** (Chapter 3) reduces weapon recoil by 40%, critical for the Magnum S9.
  • **Puzzle solution**: The Clock Tower gear puzzle in Chapter 5 requires the **Bronze Gear** (east tower) and **Silver Gear** (west tower) – place them in that order to open the sealed door.
  • **Boss strategy**: The **Goliath Alpha** (Chapter 7) is weak to fire; use the **Flamethrower** (found in the munitions room, Chapter 6) to burn its armor, then aim for the exposed heart.
  • **Achievement tip**: "No Stone Unturned" requires finding all 30 **Emerald Shards**. Use the **Detector Module** (upgrade, Chapter 4) to ping nearby shards within 20 meters.

    Weapon Locations & Upgrades ### Handguns
  • **Sentinel 9** (Chapter 1): On the desk in the police station safe room. Upgrade the **Extended Mag** (+12 rounds) at the workbench for better sustained fire.
  • **Viper .45** (Chapter 4): Inside the locked armory (requires **Security Keycard**, found on the dead officer in the sewer). Its **Hollow Point** rounds deal 30% more damage to unarmored enemies. ### Shotguns
  • **Warden 12** (Chapter 2): Behind the barricaded door in the warehouse (use **Crowbar** to pry it open). The **Choke Mod** tightens the spread by 25%.
  • **Breacher** (Chapter 5): In the basement of the church, inside a metal chest. Requires **Heavy Bolt Cutters** (Chapter 4, near the crashed truck). ### Rifles & Magnums | Weapon | Location | Best Upgrade | Notes | |--------|----------|--------------|-------| | **Marksman Rifle** | Chapter 3, sniper's nest (rooftop) | **Precision Scope** (reduces sway 50%) | Great for taking out **Regenerators** from range | | **Magnum S9** | Chapter 6, locked safe (code: 1978) | **Stabilizer Stock** (recoil -40%) | One-shots most standard enemies |

    Puzzle Solutions (Step-by-Step) ### Clock Tower Gear Puzzle (Chapter 5) 1. Enter the clock tower and inspect the broken mechanism. 2. Find **Bronze Gear** in the east tower (behind a bookshelf, push it aside). 3. Find **Silver Gear** in the west tower (inside a glass case, break with crowbar). 4. Insert Bronze Gear first, then Silver Gear. Turn the crank counterclockwise until the door clicks. 5. *Pro tip*: If you insert the Silver Gear first, the mechanism jams and you'll need to restart from a checkpoint. ### Water Pump Puzzle (Chapter 3)
  • You need to fill the reservoir to lower the bridge. Turn the valves in this order: **A → C → B**.
  • Wait 30 seconds between each turn for pressure to build. If you rush, the pipes burst and you lose progress.

    Boss Strategies ### Goliath Alpha (Chapter 7)
  • **Phase 1**: The beast charges. Dodge sideways (not backward). It has armored plates on its front; shoot the **gas tanks** on its back to expose the heart.
  • **Phase 2**: At 50% health, it slams the ground, causing shockwaves. Jump over them (timing is tight – practice once). Use **Flamethrower** to burn the armor, then unload with **Magnum S9**.
  • **Loot**: Drops **Goliath Heart** (crafts into a **Health Booster** that restores 100% HP). ### The Puppeteer (Chapter 9)
  • This boss controls multiple zombies. **Ignore the minions** – they respawn infinitely. Focus on the main body (glowing red eye).
  • Use **Flash Grenades** to stun it for 5 seconds, then shoot the eye with **Marksman Rifle** (3 critical hits ends the fight).
  • **Achievement**: "Puppet Master" – complete this fight without killing any minions. Stay mobile; don't stop moving.

    Achievement & Collectible Guide ### Emerald Shards (30 total)
  • **Detector Module** (workbench upgrade, Chapter 4) makes them visible as glowing dots on your minimap. Essential for the "No Stone Unturned" achievement.
  • **Hard-to-find shards**: - **Shard #14**: In the sewer, under the grate (use **Pipe Wrench** to lift it). - **Shard #22**: On the balcony of the hotel (jump from the adjacent roof). - **Shard #29**: Inside the broken elevator shaft (use **Grapple Hook** to descend). ### Speedrun Achievement: "Under 3 Hours"
  • Skip all optional cutscenes (press Start then Skip).
  • Use **Sentinel 9** with **Extended Mag** – best balance of damage and ammo conservation.
  • Don't collect shards; ignore side puzzles. Rush through chapters: Chapter 1–2 (15 min each), Chapter 3–4 (20 min each), Chapter 5–9 (25 min each). Total ~2h45m if you know the routes.

    FAQ **Q: Where is the best healing item?** A: **Green Herbs** are common in Chapter 1–3. Mix three with a **Blue Herb** to craft a **Full Heal** (restores all HP and cures poison). The **Health Booster** (crafted from Goliath Heart) is a one-time full heal but rare – save it for bosses. **Q: Can I upgrade weapons more than once?** A: Yes, each weapon has 3 upgrade slots. You find **Weapon Parts** throughout the game – 12 total. Each part is single-use, so choose wisely. Priority upgrades: **Extended Mag** for handguns, **Choke Mod** for shotguns, **Stabilizer Stock** for magnums. **Q: What's the secret weapon?** A: The **Infinite Rocket Launcher** – requires completing the game on **Hardcore** difficulty. It's in the bonus content menu after you finish; it takes up a weapon slot and has infinite ammo. Great for speedruns.