Instructions
Start "Bonus Game 1" with any of the eight original characters in the game. These include Mario, Link, Yoshi, Kirby, Donkey Kong, Pikachu, Samus Aran and Fox McCloud.
Beat this bonus game by knocking out all of the targets within the time limit. You can use kicks, punches and secret moves (such as Link's bombs or Mario's fireballs) to accomplish this task.
Defeat Luigi, who appears after you finish the bonus game. If you lose the fight against Luigi you will need to complete the bonus game again to rematch Luigi. After you beat him in the fight he becomes a playable character in the game.