Secret Weapons Over Normandy
From the starting menu where “New Game” or “Continue”
can be selected (AKA main title screen):
U,R,D,L,U,R,D,L,L1,R1 – Infinite Ammo
U,D,L,R,L,L,R,R,L1,L1,R1,R1,L2,R2 – Invulnerability
where U – Up
D – Down
R – Right
L – Left