Unlock Black And White Mode:
Successfully complete 'Easy' difficulty.
Unlock Infinite Ammo:
Successfully complete 'Normal' difficulty. If a player retires or is killed this cheat needs to be 'reactivated' at the start.
Unlock Authentic Mode:
Successfully complete 'Hardest' difficulty. This mode has no reticules, checkpoints, icons or saves.
Unlock Super Squad:
Successfully complete 'Authentic Mode'.