Sonic the Hedgehog, discovers a warp pipe that sucks up everything in his world and into the Nintendo Multiverse, specifically the Mushroom Kingdom. There he teams up with Mario to defeat Bowser and Dr. Eggman from merging both their worlds together. But to get to them, they'll have to compete in an all-sports tournament, which includes kart-racing, olympic games, golf, tennis, party games, and a fight to the finish!
