Ever wondered what Mario would feel like if he was dropped into Sonic's world? This weird little Flash gem lets you find out. You're still jumping on Goombas and dodging spikes, but everything moves faster, and the levels have that classic Sonic loop-de-loop energy. At first, it feels off—Mario's weight doesn't quite match the speed—but after a few tries, you start nailing those long jumps over bottomless pits.

Some of the enemy placements are brutal, like Hammer Bros waiting right after a blind curve. And good luck with the water levels—Sonic’s physics make those extra slippery. But beating a stage feels oddly satisfying, like you hacked the universe to make these two worlds collide. Just don’t expect it to play like either game normally would.