The second game in the Super Mario Bros series. Following the success of Super Mario Bros., Nintendo decided to follow it up with a Mission Pack Sequel, titled Super Mario Bros 2. There were four main differences between the original and the sequel: the two-player mode was replaced by the option to play the game as either Mario or Luigi, Luigi was given higher jumps but inferior traction, some of the graphics were updated, and the game was about as close to Platform Hell as one gets short of a romhack.