You already have an NSO subscription and want to play Super Mario Bros. for free.

Both games look nearly identical at first glance. They feature the same timeless 8-bit visual style, tight physics, and legendary soundtrack composed by Koji Kondo. However, underneath the surface, is an entirely different beast designed to steal your pocket change and push your platforming skills to the absolute limit.

Generally bare-bones. You are playing the raw game file without added features, though homebrew emulators like RetroArch offer better customization. Cost & Legality

You have mastered the original NES game and want a fresh, punishing challenge. You love competing on global leaderboards for high scores.