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Super Mario Bros. is a platform video game developed by Nintendo in late 1985 and published for the Nintendo Entertainment System as a sequel to the 1983 game Mario Bros.. In Super Mario Bros., the titular character, Mario, saves Princess Toadstool of the Mushroom Kingdom from King Koopa (later renamed Bowser), king of the Koopas. Mario's younger brother, Luigi, is playable by the second player in the game's multiplayer mode, and assumes the same plot role as Mario. To save Princess Toadstool, Mario conquers the eight worlds of the Mushroom Kingdom by going to the castle in each to defeat a minion of King Koopa. To reach each castle, Mario battles through three "sub-worlds" by defeating or avoiding King Koopa's henchmen. If Mario successfully fights his way through the castle and defeats the minion, a Mushroom Retainer is freed. Inside the eighth castle, Mario has a final fight with King Koopa and free Princess Toadstool.

Kingdom Hearts is a series of action role-playing games developed and published by Square Enix (originally by Square). It is a collaboration between Square Enix and Disney Interactive Studios, and is under the direction of Tetsuya Nomura, a longtime Square Enix character designer. Kingdom Hearts is a crossover of various Disney settings based in a universe made specifically for the series. Characters from Square Enix's Final Fantasy series and The World Ends with You make appearances and interact with the player and the Disney characters. The series centers on the main character Sora's search for his friends and his encounters with Disney, Final Fantasy and The World Ends With You characters on their worlds.