As weird as it sounds: Spongebob Squarepants: Battle for Bikini Bottom (The OG one).

On the surface, it’s a shit platformer game for kids, but what makes it interesting is the ways you can break the game and the lively speedrunning community. If you just try to play the game by following its rules, you’re going to have a bad time.

However, if you use cool speedrunning glitches and exploits, it becomes much more fun to break the game in ways the developers didn’t intend. I tend to play from time to time 100%ing it using exploits to reach locked areas earlier, skip entire sections, and play some levels backwards.