What open source platform game was modeled after a Nintendo game released in 1985 that required players to rescue Princess Toadstool?
Super Mario Bros. Super Mario Bros. is a platform video game developed and published by Nintendo for the Nintendo Entertainment System home console. Released as a sequel to the 1983 game "Mario Bros.", "Super Mario Bros." was released in Japan and North America in 1985, and in Europe and Australia two years later. In "Super Mario Bros.", the player controls Mario and in a two-player game, a second player controls Mario's brother Luigi as he travels through the Mushroom Kingdom in order to rescue Princess Toadstool from the antagonist Bowser.
Pushmo Pushmo, known in Europe and Australia as Pullblox and in Japan as Hikuosu (引ク押ス , lit. "Pull Push") , is a downloadable puzzle game developed by Intelligent Systems and published by Nintendo for its Nintendo 3DS handheld system, available on the Nintendo eShop. In the game, players must shift around puzzle blocks in order to create steps and platforms, ultimately to reach children who have been trapped within the giant structures. A sequel, "Crashmo" (known as "Fallblox" in Europe and Australia), was released for the Nintendo 3DS in 2012. A third game, "Pushmo World" (known in Europe and Australia as "Pullblox World" and in Japan as "Hikuosu World"), was released for Wii U on June 19, 2014. A fourth game, "Stretchmo" (known in Europe and Australia as "Fullblox" and in Japan as "Hikudasu Hippaland"), was released for Nintendo 3DS in May 2015.