On the title screen type "YICKE YACKE HIHNERKACKE" (with spaces), hold down the 'Left Shift' button, hold down "1", release"1", release 'Left shift'. The title should turn to blue. Go to the game. Keys '1' to '7' take you to the levels, 'F1' to 'F5' select weapons and "G" gives you gold. Check out the other function buttons as well.