I have been doing this forever, if you get the high score over a certain threshold you can get a free game (400,000?)

I would usually get accused of memorizing all the pictures.

You will get bored or a headache before you stop getting free games using this technique.

You can get stifled by the older machines with faded CRT screens. The newer LCD (that's how old these games are...) are usually better to play on.