RHDP8P
House of the Dead 2&3 Returns

House of the Dead 2

Infinite Ammo [Crashzer]
044078EC 60000000

Zombie attacks don't hurt (both players) [giantpune]
040C020C 38C90000

Don't get penalized for shooting civilians (both players) [giantpune]
040C0388 38C90000

Freeplay [Yamishira]
00407753 00000001

Infinite Bullets [Yamishira]
004078ED 00000006

Infinite Life [Yamishira]
004078D7 00000009

All Items & Infinite/Max In Original Mode Trunk [Yamishira]
00404340 00200063
(Put 1 Item In The Trunk To Make All Items Appear)
(Thanks James0x57 for the formatting)

House of the Dead 3

Infinite Ammo both players [giantpune]
040C020C 38C90000

Zombie attacks don't hurt (both players) [giantpune]
040C020C 38C90000
*All giantpune's codes will not won't crash the other game. ie, HoD2 codes won't hurt anything while playing HoD3 and vice versa

Infinite Credits [Yamishira]
00430B7B 00000063

Infinite Life [Yamishira]
0042F29F 00000005

Infinite Bullets [Yamishira]
0042F367 00000006
All codes only tested as Player 1