Hold ESC to pause game play. Activate the following cheats by entering the corresponding codes while holding F12. Then, release all keys and press SPACE to resume game play. A message will confirm correct code entry:

CHEAT FUNCTION - CHEAT CODE
Full health - UP(3), LEFT(5)
Full sword power - UP(2), LEFT(2), RIGHT(2), LEFT,LEFT
Unlock all doors (except current room)- UP(2), RIGHT(2), UP(4)
Level skip - LEFT, RIGHT, LEFT, UP, RIGHT, UP(3)