The House Of The Dead 3 - Platform: XBox

Unlocking Free Play:
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To unlock Free Play in Survival Mode (Infinite credits), finish any 
chapter with a rank of 'A' or 'S'. When you get Game Over, you can 
save your game with Free Play unlocked. Free Play is ONLY available 
in Survival Mode. 

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.

Extra items in original mode:
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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 unlocked the free play option for House Of The Dead 3.

Alternately, reset the game and when the title screen appears, go to 
main menu and select The House Of The Dead 2. It will take you to the 
elevator. Note: If you did not save the game before resetting, all the 
items you unlocked on the elevator from the last time will be lost.