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[[File:Fountain Health.jpg|200px|thumb|left|Mario hanging around in some type of fountain that can refill his HP when touched.]]

The door takes them back to Dimension D, where they find themselves trapped in a room, but they escape with Mario's flop ability. They find Dimentio, where Jaydes gives them a new task of escorting Luvbi to [[The Overthere]], where her father [[Grambi]] lives. They make their way past [[Underwhere Road]], where they find Bowser, get past three Door Guardians (Dorguys the [[Dorguy the First|First]], [[Dorguy the Second|Second]], and [[Dorguy the Third|Third]]), and fight the three-headed [[Underchomp]]. They then ascend the [[Overthere Stair]], finding Peach en-route, once more in need of revival, although this time it is because she took bite of a forbidden [[Golden Apple]], and must eat another apple to recover. When they reach The Overthere, they find it already overrun with evil [[Skellobit]]s, while their leader, [[Bonechill]], had already frozen Grambi as part if his bid to take over The Overthere. He reveals that Luvbi is the final Pure Heart, having been given Nimbi form by Grambi, and intends to use her for his evil purposes, but the four heroes defeat him and his skeleton army falls to the [[Nimbi]]s. After a fierce argument with her parents and a final, tearful goodbye, Luvbi transforms back to her Pure Heart form and is taken back to Flipside by Mario and the gang.