Question: What open source platform game was modeled after a Nintendo game released in 1985 that required players to rescue Princess Toadstool?
Sentence (from "Super Mario Bros."): 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.
Relevant evidence: Yes