Fatal Experiment 3

v0.13.3·Updated 2026-06-17

24 Expeditions. Tons of unlockable gear. Even more enemy variants. Pure chaos. Team of 4 recommended.

About this mod Author’s original text

Welcome to Fatal 3 by Project Zaero and Dinorush.

  • Rundown is currently in development. A through D tiers are complete, with E tier being partially completed.

Features

  • 24 levels up to the completion of E4.
  • 7 levels contain secret commands to increase their difficulty. Use at your own risk!
  • A bunch of crazy unlockable custom weapons. Beat levels to unlock them!
  • A bunch of crazy custom enemies.
  • An absurd amount of playable enemy cosmetics.
  • Some enemies unique to FE3.
  • Several new dangerous variants of existing custom enemies.
  • Bosses have global health bars when awake, up to 3 displayed at once.

Class System

  • Try to pick a class that will help best for the mission, or play your favorite class!
  • Has classes balanced for Solo and Duo players as well.

Credits

  • Dinorush: Send gear feedback to him!
  • Created and balanced all the gear.
  • Redesigned B Trial.
  • Some levels' secret commands.
  • Miscellaneous adjustments and bug fixes.

Install & use Install: follow the bundled instructions

  1. Unzip the archive from playbuff and read the bundled readme / instructions first.
  2. Most mods rely on the game's mod loader — the usual route is a community mod manager (such as r2modman): pick this game, install, and it handles the loader and dependencies.
  3. For a manual install, put the mod files into the matching Mod / plugins folder inside the game directory.
  4. Launch the game to confirm it loaded; mods with listed dependencies need those installed as well.

Install locations vary a lot between mods — the bundled readme is the most reliable guide.

Dependencies

Install these first, or the mod will not work:

dakkhuza-FloatingTextAPIFrog-GearPartCustomizationFlowaria-ClickLocalia-PingEverythingUntilted-FasterHackingMinigameFlowaria-LGTunerFody55-GTFO_ShootInTheAirFrog-CleanClothes

File & checksum

Filename
Fatal_Experiment_3-0.13.3.zip
File size
13.5 MiB