All Working Gotcha Force Cheats - GameCube

Solo battles
Successfully complete the game to fight battles with partners by yourself.

Special option
Successfully complete the game two times to unlock the "Special" option in story mode. Use this option to replay any story mode battle.

Blue G Red
Successfully complete the game four times to unlock a blue colored G Red.

Silver G Red
Successfully complete the game six times to unlock a silver colored G Red.

Silhouette G Red
Successfully complete the game eight times to unlock a silhouette G Red.

Shadow Neo G Red
Successfully complete the game nine times to unlock Shadow Neo G Red.

Wire Girl: Retract move
Press [X]x2 to retract Wire Girl through anchor points.

Acceleration Ninja: Bonus attacks
Jump into enemies to give them extra damage.

Glitch: Instruction manual spelling
On the last page about where they show some of the borgs, the Cutter Ninja there is really the Shrunken Ninja in the game.