The following debug keys work for version 1.1 of Halloween Harry only:

Code                 Effect
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[Ctrl] [R] [E] [N] - Gives you all weapons, and activates god 
                     mode for several seconds. 
[alt] [L]          - Level warp. Type the number of the episode (1-4), 
                     followed by the number of the level (1-5). Illegal 
                     input will dump you to DOS. This can not be used in 
                     the shareware version to access levels in the registered 
                     version. 
[alt] [=]          - Change location within a level. Type coordinates after 
                     this code; illegal input will probably crash the game.