Robot Wars Extreme Destruction

Extra money: 
Press L, R, L, R, Y, X, Up, Left, Up, R, L, R at the 
competition mode menu. 

House Robots: 
Press R, L, Up(3), L, R, Down(3), X at the competition 
mode menu to unlock the House Robots in the arcade mode 
garage. 

All arenas: 
Press R, L, Down(3), L, R, Up(3), Y at the main menu. 

Unlimited time: 
Pause game play, then press R, L, Up(3), L, R, X(3), Y. 

Toggle invisibility: 
Pause game play, then press R, L, Right, Left, Right, 
Left, Right, Left, Y, X(4), R, L. 

Transparent armor: 
Pause game play, then press R, L, R, Y(3), Left, Right, 
Left, Down, Y. 

Toggle AI: 
Pause game play, then press R, L, X, Y, X, Y, Up, Down, 
Up, Down, R, L, R.