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The famous Arcade game, that is often considered the first game to feature Luigi.
The gameplay is that you play as Mario (2nd player plays as Luigi), and you hit blocks underneath enemies (or hit the POW block) and it'll stun the enemy, then you go touch the enemy and then they are defeated, repeat the process, and you get to go to the next stage. After a certain amount of stages, it takes you to a bonus stage where you try to collect as many coins as you can under a time limit. If you collect them all, you get an extra life.