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.
Wonder Momo Wonder Momo (ワンダーモモ , Wandā Momo ) is a 1987 beat 'em up arcade game that was developed and published by Namco exclusively in Japan. It was the company's last 8-bit arcade game (and the last that ran upon their System 86 hardware), and was ported to the PC-Engine in 1989, with both versions of the game later ported to the Wii Virtual Console. The game was also included in "Namco Museum Encore" for the Sony PlayStation and mobile on June 2005. "Wonder Momo" inspired a webcomic series in 2012, an anime series in February 2014, and a sequel game by WayForward Technologies in May 2014.