This is a custom hack of the original Super Mario Bros for the NES. It lets you tweak the rules before you start, choosing your lives, timer speed, and credits. It's a solid choice for players who know the classic inside out and want a fresh challenge.
The gameplay is the tight, precise platforming you remember, but your custom settings change the feel. You can make it a relaxed run or a frantic race against a fast timer. The big surprise is the control you have, letting you tailor the difficulty to your mood. Give it a shot if you want to remix a classic.