Here is a way to automatically calibrate your lightgun. When turning on the game, make sure only regular controllers are hooked up to the system. Go into any mode (survival mode, etc.), and then pause. Now take out the controllers and plug in the lightguns. Your lightguns should be aligned properly.

While riding the elevator down to House of The Dead 2, the door will open a couple of times. Shoot all the enemies as quickly and as accurately as possible to get items for original mode in House Of The Dead 2.

Clear game with an "A" rank, then increase the credits past nine until "Free Play" appears in the options screen.

Clear the game in original mode.

Clear original mode. The costume will appear in the trunk of the car in the next time you play original mode.

Play original mode and select "2.0 Bullets" and "Double Score" items from the trunk. Rescue all civilians except for the second person on level 4. Clear the game to enter the bonus room at the end. A Rogan Costume and Infinite Credits will be in the room.

Get 70,000 points to play on the "Sin" difficulty in original mode. Get the Bruno costume when a maid comes out of a secret room, hands it to you, and wishes you good luck.

Clear original mode without losing any civilians and with a score of 1000,000 points or more.

Clear training mode with five red stars in each section.

Clear training mode and boss mode with five red stars in each section. Get at least two stars in the "Fight All" section.

Clear Boss Mode with five red stars on all the bosses.

To unlock House of the Dead 2, beat the game once on any difficulty. House of the Dead 2, in all of its splendour, will be playable.