Splinter Cell: Double Agent Cheats - GameCube
Primary Collection of Cheats
Unlock Elite Mode
Co-op Elite Mode - Beat Co-op Campaign once
Solo Elite Mode - Beat Solo Mode once
Unlock Endings
Depending on what bombs you defused in Mission 8 (JBA Headquarters Part 2), you will get a different ending to the game.
JBA Ending - Do not defuse either Bomb.
Neutral Ending - Defuse only one of the Bombs.
NSA Ending - Defuse both LA and Nashville Bombs.