Tetsujin 28-Go Cheat Codes for Playstation 2

Unlock the six locked missions
In Challenge Mode, by pressing the circle button in any of the six locked missions, you will be asked to type a password to unlock each one.

Password - Effect
Bucchus - Unlock mission 40
Suspense - Unlock mission 41
Monster - Unlock mission 42
BlackOx - Unlock mission 43
Franken - Unlock mission 44
Makimura - Unlock mission 45