The first Mario game that was developed differently, and the first to be not released in Arcades. and it was the game that helped the NES get popular, and saved Video games from the video game crash of 1983. Super Mario Bros was released in 1985.
The gameplay is that you play as a plumber named Mario, and the powerups are mushrooms that make you big Mario, when you are big mario, you can collect fire followers that make you Fire Mario, and Starmen make you invincible. The game has 8 worlds, and after you beat the game once, you can play a harder version of the game.