I'm not sure if the title is Engrish or if there's someone named Ret that is somehow involved with this game. Either way, the first world of this game is great for beginners to hone their glitchhack skills. However, the difficulty ramps up ridiculously in the second world and beyond, requiring walljumps, wall entering and other such things.
Download(Patch to "Super Mario Bros. (JU) [!].nes")