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.
Bonk's Adventure Bonk's Adventure is a 2D platform video game developed by Red Company and Atlus as the first game in the Bonk series that was released in 1989 in Japan and 1990 in North America for the TurboGrafx-16. In Japan it was released as PC Genjin (PC原人 ) in 1989, a play on the Japanese name for the system, 'PC Engine'. The game was re-released for the TurboGrafx-16 in the U.S. in 1992 on the "Gate of Thunder" 4-in-1 game CD-ROM. The game was later ported to the NES, Game Boy, Amiga, arcade systems under different titles (FC Genjin, GB Genjin and BC Genjin). It is also available through Nintendo's Virtual Console service, on the PlayStation Store and there is a version for mobile phones in Japan.