Seller baseball.maniac.8 is letting go a bunch of unreleased/hacked games. Basically Princess Peach Toadstool is a remade version of Super Mario Bros. 2 except you can only select from 4 different Peaches to play with. The SMWR game is also a hack of Super Mario World, but a whole new adventure.
Princess Peach Toadstool – NES
Super Mario Bros. Special – NES
Super Mario Bros 2: The lost levels – NES
Super Contra 7 for NES
Secret of Mana 2 – SNES. 1-3 players! seiken Densetsu 3
Super Mario World: Return to Dinosaur Island – SNES