Play Super Mario Sunshine 128 Online
You start outside the castle—left or right?—then bounce through janky little levels hunting Sunshine Stars, laughing when the arrows lie and you eat dirt. Pure early-2000s Flash weirdness.

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Game Overview
Super Mario Sunshine 128 is one of those old-school Flash games that feels like a weird little remix of Mario 64. You start outside a castle—classic—and the first choice is whether to go left or right. No pressure, but I always went right first because that painting looked less suspicious.
The levels are bite-sized, which is nice when you just want to blast through a few. Mostly you're platforming to the end or hunting down a Sunshine Star (basically this game's version of a Power Star). The arrows help, but sometimes they point in ways that make you go, "Wait, really?" Still, it's got that janky charm where slipping off a ledge is half the fun.
Honestly, it's a solid time-waster if you miss that era of Flash games where everything was a little rough around the edges.