My brother had a Commodore 64 that had a tape deck and used an old tv as a monitor. We played knock-off games like Shark Attack (which was a complete mind-eff) and Millipede (Centipede). Shark attack was based on leading out lines of rope to block off safe places for yourself from marauding sharks. Only, if you stacked too many rope layers, the sharks could suddenly eat through them and get to you. You also had to keep moving at all times. I think I had my first panic attack playing that game.