Cheat:
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 Type any of these into the castle selection screen. 
 For some to be accessable you might need showmethemoney. 
 
 draculasucks   - 60 Dracula's Impossibly Hard Castle 
 penultimate    - 52 Impossibly Hard Castle 
 speedracer     - 42 Impossibly Hard Castle 
 peoplemover    - 32 Impossibly Hard Castle 
 transporter    - 22 Impossibly Hard Castle 
 jumparound     - 12 Impossibly Hard Castle 
 reapershmeaper - 45 Grim Reaper's Very Hard Castle 
 booyah         - 42 Very Hard Castle 
 polevault      - 32 Very Hard Castle 
 livelarge      - 22 Very Hard Castle 
 skipstone      - 12 Very Hard Castle 
 killthewabbit  - 30 Warlock's Difficult Castle 
 hopscotch      - 22 Difficult Castle 
 leapfrog       - 12 Difficult Castle 
 
 MISC. CHEATS:
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 I haven't figured out what some of these cheats do yet, 
 some are very wierd in combination with others. 
 showmethemoney - permanent access to all castles 
 burger         - toggles on start dead (one less life) 
 showinfo       - toggles off info about monsters before 
                  each level 
 actionjackson  - toggles off the frame-rate limiter