Game Storyline: Bowser and Bowser Jr. have kidnapped Princess Peach again, and only Mario can save her. Characters: Mario, Luigi, a ton of Mushroom Kingdom enemies, both new and old, Peach, Bowser and Bowser Jr. How to progress through the game: Run, jump and battle enemies through multiple levels in each world. Every time players finish one world, they can move onto the next, but each level features impediments in the forms of fortresses, Hammer Bros. and bosses. After defeating the boss of each world, players can move on to the next, culminating in the final fight in the last world.