Super Paper Mario

Super Paper Mario is a platform game with action role-playing elements, differentiating itself from previous games in the series. Like its predecessors, the graphics consist of 3D environments and 2D characters which look as if they are made of paper. The player controls Mario and various other characters, overcoming linear platforms as in other Mario games. The player's goal is to collect the eight Pure Hearts and defeat the main antagonist Count Bleck.

The player can talk to non-player characters (NPC), defeat enemies, or interact with the environment. Unlike previous Paper Mario games which used a turn-based battle system outside the overworld, in Super Paper Mario all combat is in real-time. Experience points are gained after defeating enemies and allow the player to level up to increase their stats. Mario can temporarily "flip" between dimensions, where the camera rotates 90 degrees to reveal a 3D perspective of the stage, revealing elements hidden in the regular 2D perspective, and can be used to maneuver around obstacles impassable in 2D.

Super Paper Mario opens with Count Bleck abducting Bowser and Princess Peach and forcing the two to marry. Their union, as foretold by the Dark Prognosticus, summons the Chaos Heart. Bleck takes control of the Chaos Heart and uses it to open the Void, a slowly expanding inter-dimensional rift, in order to destroy the flawed universe and create a perfect one in its place. Mario is teleported to Flipside by Tippi and is tasked by Merlon to collect the eight Pure Hearts, which are necessary to undo the destruction. Mario, after learning the ability to flip between dimensions, starts his journey with Tippi at his side, traveling to the different worlds to collect them.

During the adventure, Mario reunites with Peach and Bowser, who join him in the quest. Bleck sends his minions, Dimentio, Mimi, and O'Chunks, as well as a brainwashed Luigi known as "Mr. L", to attack Mario's group and slow their progress. Luigi eventually recovers his memories and is the last to join Mario's group. Mario succeeds in collecting all eight Pure Hearts, but not before the Void grows large enough to obliterate one of the worlds.

Intelligent Systems developed the series' previous games and Super Paper Mario. Director Ryota Kawade changed the traditional concept of previous games with the intention of surprising fans with a new concept. While creating game concepts, he implemented switching through dimensions; he differed the combat from previous game entries to fit with the idea of dimension swapping. When presented to producer Kensuke Tanabe, they both agreed the game would work better in the style of an action-adventure video game, though he asked the staff to keep a role-playing game plot.

Kawade found it difficult to "create a harmonic relationship between the worlds of 2D and 3D", and noted that the process consisted of trial and error. He said how creating one level "required the efforts of creating two levels", as they aimed for adding secrets in 3D that were not visible in 2D.

According to the review aggregator website Metacritic, Super Paper Mario received "generally favorable reviews" with a score of 85 out of 100, based on 57 critics; it has the sixth-highest score among Wii games released in 2007.

The dimension-flipping mechanic received generally positive reviews. Gamasutra described the game as a "landmark Wii release" and a "hit with critics". The dimension-flipping mechanic, puzzles, creativity, and writing received praise from critics, and most criticism was directed at its inability to please those looking for a pure RPG or platforming game. Its story also received praise, although some criticism was directed at the large amount of text.