On the title screen, type "LEVELn" and press fire to start on the corresponding level. Where 'n' is the level number like "LEVEL2" to go to level two.
Also, on the title screen type "CHROME" to enter the sub game. On the CHROME title screen, type "HELO TO GORDON AND DAVEE". Start the game and you will be invincible. For the level codes see CHROME.
Note: The cheat for Chrome only works with the Switchblade 2 sub game. It doesn't work in the stand alone version!