Goldman Costume:
Complete Original mode. The costume will appear in the back of the car the next
time you play.

Unlock House of the Dead 2:
Complete the game on any difficulty to unlock House of the Dead 2.

Infinite Credits (House of the Dead 2):
Complete Training and Boss mode with five red stars in each section to unlock
infinite credits.

Thanks for this contribution go to:
Dokta (Dokta@Newsring.de)