- Completion bonuses in House Of The Dead 2
Successfully complete House Of The Dead 2 to unlock the Very Easy and Very Hard difficulties; and the abilty to increase lives to 5 and continues to 9. Successfully complete House Of The Dead 2 in Original mode to unlock the House Of The Dead 2 mini-game. It becomes available when you choose House Of The Dead 2 again at the main menu. The mini-game has prizes that are items from House Of The Dead 2's Original mode. Notice: You cannot play the mini-game again until you complete House Of The Dead 2's Original mode again.

- Extreme mode in House Of The Dead 3
Successfully complete House Of The Dead 2 and House Of The Dead 3 to unlock Extreme mode, which is a single player only mode that requires you to hit weak points on enemies in order to kill them and allows you to use a blocking attack.

- Free Play mode in House Of The Dead 3
Successfully complete the first two chapters of House Of The Dead 3 on the Extreme difficulty to unlock the 'Free Play' (infinite credits) option.

- Realize display in House Of The Dead 2
At the title screen, press Left two times, Right three times, Left, Right, A. If you entered the code correctly, a '0' score will appear at the top of the screen.

- Completion bonuses in House Of The Dead 3
Successfully complete House Of The Dead 3 to unlock the Very Easy and Very Hard difficulties; and the abilty to increase lives to 5 and continues to 9.

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