Atari 2600 VCS Peter Penguin
This site is still missing in the Easteregg Guide. Not sure why, but it was removed sometimes and not added again.

There I found a trick to get invulnerable forever. Not sure if I found it as I was a kid. And not sure if someone else ever found it out. So its maybe too a trick, which was unknown for a long long time (over 20 years).

There is only one error, the game doesn't end at 5,085 points, it end, when you don't press long enough the Joypad / stick. And the first time I try it it was at 5085 points. Maybe it takes 5 minutes till the game ends, not sure anymore.