On the title screen type "YICKE YACKE HIHNERKACKE", hold down the 'LEFT SHIFT' BUTTON, Hold down "1", release "1", release 'LEFT SHIFT'. The title should turn to blue. During play use any of the following keys:
'1'-'7'--Jump to corresponding level
'F1'-'F5'-------------Select weapons
'G'-------------------Gives you gold
Check out the other function keys as well.