Many early 80s 8-bit console games worked this way. I'm thinking of games like Transbot for the Sega Master System. There are a few different levels, with vario

Many early 80s 8-bit console games worked this way. I'm thinking of games like Transbot for the Sega Master System. There are a few different levels, with various enemy configurations and scenery, but it has no ending and goes on forever without any real changes.