Successfully complete the game with an "A" rank. Enter the options screen and select "House Of The Dead 3". You can now increase the credits past nine until "Free Play" appears. Alternately, play well and get better than an "A" rank one or more times during the game at the point where you lose all your credits. This works best in one player mode.
Successfully complete House Of The Dead 3, then go to House Of The Dead 2. You will take an elevator down to House of The Dead 2. On the way down, 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. Complete House Of The Dead 3 again to repeat the process. Every time you do this, you will get new items for original mode. This works best if you have unlocked the free play option for House Of The Dead 3.
Successfully complete survival mode in House Of The Dead 3 to unlock House Of The Dead 2.
- Play as Gary
Use a controller in port two to play as Gary instead of James in single player mode.
- Red blood
Successfully complete original mode to unlock a selection for blood color on the options screen.
- Goldman costume
Successfully complete original mode to unlock the Goldman costume in the trunk of the car in the next original mode game.
- Goldman zombie
Enable the "Infinite credits" bonus. Play through the game and shoot every hostage and try to get the lowest score possible. Towards the end of the game, when the last door is opened, Goldman will appear like a zombie.
- Rogan costume
Begin a game in original mode and select the 2.0 Bullets and the Double Score items from the trunk. Rescue all civilians except for the second person on level 4. Complete the game and enter the bonus room at the end. A Rogan Costume and an Infinite Credits item will be in the room.
- Bruno costume
Accumulate over 70,000 points and play on the "Sin" level in original mode. You can get the Bruno costume when a maid comes out of a secret room, hands it to you, and wishes you good luck. Note: It is a good idea to have the Double power-up when you are attempting to get the costume.
- Bonus room
Successfully complete original mode without losing any civilians and with a score of at least 1000,000 points to reach a bonus room full of items at the end of the game.
- Extra options in Boss mode
Successfully defeat and obtain a high score ranking for all bosses in boss mode. "Emperor" and "Fight All Bosses" options will now be unlocked.
- Infinite death bullets
Successfully complete training mode with five red stars in each sections. This will unlock the infinite chamber item in the trunk in original mode that kills with one hit.
- Infinite continues in original mode
Successfully complete training mode and boss mode with five red stars in each section. Finally, get at least two stars in the fight all section. A continue infinity item will appear in the trunk in original mode.
Go to the fifth chapter in original mode to the section with the second battle the Boss that has the heart that opens and closes. Immediately following that segment, you will drive up to two vans with four zombies. Shoot the back door of the van on the left, then kill the zombies. Then the van on the right will open. Kill those zombies. When you turn back towards the van on the left again, shoot the coin with the infinity symbol to get unlimited continues. The coin will only appear if you have over 100,000 points. Using a double score bonus while playing is recommended.
You can also get the infinite continues coin in the Sin level in original mode. If you have over 100,000 points by the time you get to the Emperor, a secret room will open and a infinite credit item will be inside.
- Extra $ point credits
For more points added to your score when you complete a level, simply shoot various other items during a game. Shoot lamp post lights, lanterns, stacks of books, jars, tires on boats, windows on cars, chairs, and other furniture. Shooting barrels and drums, however, will not give you extra points, but may reveal items.
- 1/4 Life item
Successfully complete Boss mode with five red stars on all the Bosses. In the trunk of the car in original mode, you will have an item called 1/4 Life. This makes the zombies easier to kill.
- Red blood