Cheat Mode:
Press ~ during game play, then type one of the following codes at the "Omen" prompt. 

Code                   Result  
mdkNewGame(1,12)       Level 1   
mdkNewGame(2,12)       Level 2   
mdkNewGame(3,12)       Level 3   
mdkNewGame(4,12)       Level 4   
mdkNewGame(5,11)       Level 5   
mdkNewGame(6,8)        Level 6   
mdkNewGame(7,11)       Level 7   
mdkNewGame(8,8)        Level 8   
mdkNewGame(9,13)       Level 9   
mdkNewGame(10,7)       Level 10   
mdkNewGame(11,1)       Level 10/first bonus   
mdkNewGame(12,1)       Level 10/second bonus   
mdkGobSetDamageFilter  (mdkGetPlayerGob(),0)God mode   
GodDebugToggle()       Toggle God mode