Super Mario Co-Op Coin Challenge 1.1 is a ROM hack of the original Super Mario Bros. for the NES. It focuses on cooperative gameplay, challenging players to collect as many coins as possible while working together. The core gameplay remains similar to the original, but with modified level designs emphasizing teamwork and shared resources.  The '1.1' likely indicates a version update with bug fixes or minor tweaks. Information on the creator or organizing team is not readily available from the given game title.

Super Mario Co-Op Coin Challenge 1.1

Super Mario Bros. Tweaked