Toni & Friends in Kellogs Land  

Type ENGINEBYNEON in the main menu.. 
After this the following Keys can be used:

F1  More energy..
F2  More lives..
F3  More Keys..
F4  Heaps of Time..
F6  Less Energy..
F7  Warp to end of Level 1..
F8  Warp to end of Level 2..
F9  Warp to the last Level..
F10 Higher Score..