Star Wars Jedi Knight 2:
Enter any of the following codes in the cheat menu under extras to unlock the corresponding effect:

Biscuit:
Unlimited ammo

Bubble:
Unlimited health

Fudge:
Lightsaber at start 

SCOOTER:
Infinite force power in single player & Jedi Arena modes.

DEMO:
Unlocks 'Mission at Alzoc III' level 

PEEPS:
Unlock all bots in Jedi Arena mode.

FLICKY:
Unlock all movies.

CHERRY:
Unlock the first seven single player levels.

FLICKY:
All FMVs