During gameplay type in:

 HarryGetsFullHealth     Max Health
 HarrySuperJump          Super Jump
 HarryNormalJump         Big Jump
 HarryTriggerCheat       15 Beans
 HarryKoresh             Invincibility
 HarrySuperKoresh        ?
 HarryKorWalk            ?
 allzaberharry           All Spells
 HARRYDEBUGMODEON        Choose level (main menu)and debug mode ([F7] to leave)
 HARRYLOMU               All Level