Animal Well! There’s some incredibly obscure and esoteric puzzles in that game. Many of them are completely optional, but they’re so intriguing that I wanted to figure everything out anyway. I don’t think I’m anywhere near “done” yet, even though I beat the last boss already. You can unlock the ability draw on the map as well, so you can keep track of things.
Also maybe Noita? Completing a run and beating the last boss is basically just the tutorial, that game goes deep. There is an in-game achievement tracker for completing some unbelievably convoluted puzzles and challenges.
Hell yeah! Huge congratulations to mr largepenis.