You have to unlock House of The Dead II in order to do this. Save every innocent person. You might get shortcuts to go farther in the game so it would take less time to beat House of The Dead II. Also, if you save every innocent person you will get an extra life.
Blood Mode- Beat House of the Dead 2 in Survival mode
Goldman Costume- Beat House of the Dead 2 in original mode
Goldman Zombie- Enable free play, intentionally get the lowest score possible on each level in HotD 2. At the end, Goldman will appear as a zombie
You have to get a certain score in order to do this. When Tomas and G are done talking there will be a different ending how Lisa thought her dad ditched her but it was really zombies. She was like What? And she said come here you slimy bastards!
In the House of the Dead II, start in orginal mode, buy 2.0 bullets, save every civillian except for the second one in the 4th level. When you beat the emperor at the end of the game, you will get a Rogan costume and Unlimted Credits.
In Hosue of The Dead III (Since you can play House of The Dead II) Succesfully get to the last boss in the gameGo back to the main menu and go to options you can toggle the Unlimted Health.