Invincibility:
Press Y, Right, B, Left, X, Down during game play. 

All weapons:
Press A(2), Right, Y, A, Right during game play. 

Full health:
Press Down(2), A, X, B, X during game play. 

Level skip:
Press Up, Right, B, Y, Down, Left during game play. 

Speed boost:
Press Up, X, Down, B, A, Y during game play. 

Reveal all token locations:
Press Y, B, A, Left, Down(2) during game play. 

Friendly AI units:
Press B, Down, A, Down, X, Y during game play.