Get Rocket Launcher and More:
During gameplay press Triangle, X, Square, Circle, Triangle, Left. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Sniper Rifle and More:
During gameplay press Triangle, X, Square, Circle, Triangle, Right. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Uzi and More:
During gameplay press Triangle, X, Square, Circle, Triangle, Up. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Shotgun and More:
During gameplay press Triangle, X, Square, Circle, Circle, Up. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Heavy Machine Gun and More:
During gameplay press Triangle, X, Square, Circle, Triangle, Down. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Nail Gun:
During gameplay press Triangle, X, Square, Circle, X, Left. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Flight Mode:
During gameplay press Triangle, X, Square, Circle, Square, Up. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Slow Motion:
During gameplay press Triangle, X, Square, Circle, Circle, Right. A message should appear if you entered the code correctly. Repeat code to disable it.

Speed up Things:
During gameplay press Triangle, X, Square, Circle, Circle, Down. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Unlimited Ammo:
During gameplay press Triangle, X, Square, Circle, X, Right. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Invisibility:
During gameplay press Triangle, X, Square, Circle, Circle, Left. A message should appear if you entered the code correctly. Repeat code to disable it.

Max Out Charisma:
During gameplay press Triangle, X, Square, Circle, X, Down. A message should appear if you entered the code correctly. Repeat code to disable it.

Get Liberty Island Stage:
Finish the game one time using any difficulty level

Level help:
So stuck on a hard board? Maybe cant get by an area? Use the manholes to travel to different parts of the level and then do objectives there which will help you in the previous level.