There was a curious video game I played for a week straight in the early 90’s before my copy got stolen at a party.
It was called Scrongjhul and featured a fish with legs who had extra big knees with spikes. It was sort of a platform game but then part mystery story and part choose-your-own-adventure.
I think you had to get to the top of a mountain for something special. If you did it enough times and collected codes the game would generate then you could send off for some special prize.