With this game, only use the set of codes for the game you wish to play, having codes active for games you are not currently playing will cause the game to freeze/glitch. Also note, that at the end of some levels, it will use your lifes/time to calculate your overall score, turn the switch off to complete the level. The invicble codes are rather simple in their creation, sometimes running into walls (i.e. River Raid), will still kill you, & in most cases if you die with the Invincible code on, you will be stuck as 'dead' until you turn off the Code Breaker switch. Turn it back on once your character is back & you have control again.