Cheats give you unfair advantage as you use them. They are included as of Chicken Invaders: Revenge of the Yolk onwards.
Beware! Using them will disable medals, getting unlockables (CI3) and keys dropping (CI4 onwards)!
How to Unlock
Go to Options, and later Gameplay, then click Allow cheats. They'll be available as soon as you start/continue your mission.
List of Cheats
There are only four cheats, and you get them by clicking those buttons:
- F5 - Gives you extra life
- F6 - Gives you extra missiles
- F7 - Drops a single power-up upgrade from top of the screen
- F8 - Skips the wave