Rampart
Books: GAME BOY Secret Codes - Secret Codes 2003 - Game Boy Games Secrets
003-9CF-3BE Infinite time--levels don't end, switch on effects at game play
screen, off after battle mode, on to rebuild castle, off to go on
3E0-29B-081 + 090-2AB-7F5 + 000-2BB-F7D Have 6 sec. to rebuild castle walls
3E0-29B-081 + 440-2AB-7F5 + 000-2BB-F7D Have 66 sec. to rebuild castle walls
3E0-29B-081 + 770-2AB-7F5 + 000-2BB-F7D Have 118 sec. to rebuild castle walls
3E0-40B-081 + 1A0-41B-B32 + 000-42B-F71 Levels last 10 sec.
3E0-40B-081 + 2A0-41B-B32 + 000-42B-F71 Levels last 25 sec.
3E0-40B-081 + 430-41B-B32 + 000-42B-F71 Levels last 50 sec.
01E-B3B-F79 Infinite cannons
017-0EB-F79 Infinite lives