Activating this trainer:

Press F1 at main menu.

Listen for 'Trainer Activated'.

Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options:

NumPad1: Infinite Health

NumPad2: Change Score By 5000

NumPad3: Unlimited Ammo

NumPad4: Unlock Characters

NumPad5: Unlimited Missiles

Editor Options:

Score

Notes:

Unlock Characters: While active you can select any character as they are unlocked. This is only temporarily means if you deactivate this option the characters are locked again (except you unlocked them already).