All rides, shops, attractions and extra money (North American version):
Enter DEAD as a nickname and select the "End" option. During game play, enter the ride purchase menu and hold L + X + Y + Z + A + B + C. The sound of children cheering will confirm correct code entry. Hold A + B + C during game play to gain additional money.

All rides, shops and attractions (European version):
Enter DEAD as a nickname and select the "End" option. Press A + Z at the next screen.