God Mode:
Right, Left, Up, Down, A, Right, Left, Right, Left.
All Weapons:
Right, Left, Up, Down, A, Up, B, A.
Full Heal:
Right, Left, Up, Down, A, Up, Down.
Nailgun Mode:
Right, Left, Up, Down, A, Left, Left.
Equips Stealth Weapons:
Right, Left, Up, Down, A, Up, Right, Right.
Explosive Bullets:
Right, Left, Up, Down, A, Up, Left.
Megaforce:
Right, Left, Up, Down, A, Up, Up.
Sawed-off Shotgun:
With a Silent Assassin rank successfully complete 2 levels to get the
Sawed-off Shotgun.
M4:
With a Silent Assassin rank successfully complete 5 levels or complete the Shogun Showdown to get the M4.