Heart Pillar

The Heart Pillars are tall pillars scattered around Flipside and Flopside that are used to house the Pure Hearts in Super Paper Mario. Once the four heroes place a Pure Heart into a Heart Pillar, a new doorway to another dimension becomes available.

There are eight heart pillars in the game, and they are mostly found in the outskirts of Flipside and Flopside (though the game's first Heart Pillar is found on floor three of Flipside so is the fifth one, but it's in Flopside). Some heart pillars are invisible, with only the heart shaped engraving showing, until the heroes have the corresponding pure heart.