What open source platform game was modeled after a Nintendo game released in 1985 that required players to rescue Princess Toadstool?
Secret Maryo Chronicles:  "Secret Maryo Chronicles" has been described as a "Super Mario Bros." clone by "PCtipp". 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.
i don't know