All 20 Levels - Registry Cheat
     Warning:  Using this cheat requires editing the Windows Registry.
Therefore,  you  should  be  extremely  careful.  Only  change what is
mentioned  below.  If you change something you're not supposed to, you
may keep you computer from booting up:

1. You must have run Dragon Castle at least once so that the settings 
   are put into the Registry.
2. Click on the "Start" button, then "Run".
3. Type in "regedit" and click "OK".
4. Open HKEY_CURRENT_USER->Software->MistKeep->Dragon-Castle.
5. Open "settings" on the right side of the window by double clicking 
   on it.
6. Making sure to leave the format of the text intact, change 
   the 6th number to 20.

     You will now be able to access all 20 levels. If you accidentally
corrupt  the  Dragon Castle settings, uninstall it using the uninstall
program  that  is included with Dragon Castle and then start from step
1.