Cheat Mode:
     Complete all objectives in single player mode to unlock cheat mode.

God Mode:
     Unlock  cheat mode, hold Back, and then press X, X, A, B and A to
unlock god mode.

Big Heads:
     Hold  Back  and press A, X, B, Y and A during gameplay. A message
will confirm correct code entry.

Chicken Heads:
     Hold  Back  and press X, X, Y, A and B during gameplay. A message
will confirm correct code entry.

Flat Characters:
     Hold  Back  and press B, A, X, Y and A during gameplay. A message
will confirm correct code entry.

Helium Mode:
     Hold  Back  and press X, A, Y, B and X during gameplay. A message
will confirm correct code entry.

Slow Motion:
     Hold  Back  and press Y, Y, B, X and A during gameplay. A message
will confirm correct code entry.