This adds so much new stuff to the mode from the original NSMB while remaining extremely faithful to it. Every aspect - the UI, the level appearances, the sound effects - they're all on point. Up to eight players is an especially welcome addition, alongside the powerups from newer Mario games such as the propellor suit. You can pretty easily avoid all the new stuff too if you just want a full-on trip down memory lane.
If you played the original game, absolutely play this.
If you played the original game, absolutely play this.