Mario & Sonic

Mario & Sonic or Sonic & Mario is a crossover platformer-videogame consisting of characters from both Nintendo's Mario-games and Sega's Sonic-games.

Gameplay
The player can chose between Mario and Luigi from the Mario-games, or Sonic and Tails from the Sonic-games. Both Bowser Koopa and Eggman appear as antagonists, who have teamed up.