Two Marios must surely be one, even if one of them is flatter than a pancake...
When two worlds collide, both Bowser and the two-dimensional Paper Bowser start running amok across two seperate worlds. It could be one dimension more than Mario and Luigi can handle, but when help arrives in the form of Paper Mario the odds are evened up a bit.
With Paper Mario in the mix, there are more ways than ever for 3D Mario and Luigi to explore the world, solve puzzles and take down foes. Paper Mario can slip between cracks to get to hard-to-reach areas, and even turn himself into a paper plane when the going gets tough!
When things get heated and turn-based combat commences, players can use Copy Block to make extras of Paper Mario so that he's more formidable than ever. Combining the powers of all Mario, Paper Mario and Luigi, players can execute Trio Moves to get past obstacles and set loose Trio Attacks to smack down enemies.
The ante gets upped even more, however, with massive real-time Papercraft battles, with players creasing and crumpling Bowsers army.
And for amiibo fans, there's the option to create special cards that can be unleashed in battle to spectacular effect!