While in a dungeon (NOT in town!), press [Alt] + [F12] then enter EITHER "doomsday" OR "wlrnwhdakf" to activate cheat mode. You'll see "Cheatcode Enable" as confirmation. To enter codes, press [Alt] + [F12] then press [Enter] and type any of the words EXACTLY as listed below: (NOTE: you need to re-enter the codes for EACH level!)