The CI3 trainer is typically a small executable (written in C++, AutoHotkey, or Cheat Engine script) that:

For users without a dedicated trainer, the game includes native cheats, though these are often disabled in Steam and mobile versions. They are primarily available in versions purchased directly from the InterAction Studios website . Go to Options > Gameplay . Enable the Cheats toggle. During a mission, use the following function keys: F5 Add one Extra Life F6 Add one Missile F7 Spawn an Atomic Powerup F8 Skip the current wave 3. Unlockables and Progress Indicators

Disclaimer: Trainers modify game memory. Use at your own risk, and never use them in online leaderboard attempts.

If you are using a trainer to complete the game fully, focus on these "deep" mechanics: