Resident Evil 2

All weapons:
Press C-Up(4), C-Down(7), Left, Right, R + L, R + L at the
load game screen. The game will return to the main menu to
confirm correct code entry.

Unlimited ammunition:
Press Up(4), Right(4), L, R, L, R, C-Right, C-Left at the
load game screen. The game will return to the main menu to
confirm correct code entry.

Invincibility:
Press Down(4), Left(4), L, R(2), L, C-Up, C-Down at the load
game screen. The game will return to the main menu to
confirm correct code entry.