While the original NES conversion, developed in 1983, was quite accurate to the arcade version upon which it was based, many compromises were made in order to fit the game in a limited amount of memory. These compromises included the size of the enemies, the instruction cut-scenes which introduced each enemy, and the icicles which form from the top platform later on in the game. Kaettekita Mario Bros. seeks to restore all of those aspects to as close to the arcade version as possible.