This game is using Flash! After the 31st of July 2019, your internet browser might start blocking Flash, especially if you use Google Chrome. This means you'll have to activate it to play this game.
In Super Mario Crossover, the player controls one of six characters: Mario - Link - Bill - Simon - Mega Man - Samus. This game has many stages, each stage is a challenge for you. You have to overcome complicated terrain, face enemies like Goomba, Koopa Paratroopa ... Remember, you only have 3 lives!