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A Grumblump from Super Mario 3D World.
First appearance Super Mario 3D World (2013)
Latest appearance Super Mario 3D World + Bowser's Fury (2021)
Tox Box
A Grumblump in Grumblump Inferno

Grumblumps are large, multicolored crystal blocks from Super Mario 3D World and its port, appearing only in Grumblump Inferno in the Super Mario 3D World campaign. They are shaped like rectangular prisms with various proportions, including cubes. Several Grumblumps appear waiting in lava throughout the level. Once the player steps on a Grumblump, its smiling faces on each side turn into frowning faces, and it starts gradually moving along a set path through the lava, turning over on one of its sides at a time. The player must move with it to stay on top of the side currently facing upward, and avoid falling into the lava until it reaches the end of its path.

As a Grumblump turns, the player can either jump to land on the topmost face, or walk up its side like a Triangular Block. Towards the end of the level, two Skipsqueaks appear on either side of the final Grumblump as obstacles, running to stay on its center as it moves. If the player Ground Pounds a Grumblump, its faces will turn angry, and it will move faster for a short period of time.

Although visually similar to Rhomps and Tox Boxes, Grumblumps have different behavior, as they are constantly rotating objects used as platforms. They are unable to crush the player, as the lava beneath them will instantly cause a life to be lost on contact.

Names in other languages[edit]

Language Name Meaning
Japanese ゴトゴトン
From「ゴトゴト」(gotogoto, onomatopoeia for clopping or rumbling noise) and the character ん (n)
Chinese (Simplified) 滚滚方块
Gǔngǔn Fāngkuài
Rolling Cube
German Wumpel From Würfel (cube)
Italian Rimbomblocco From rimbombare (to rumble) and blocco (block)
Korean 덜컥덜컥
Deolkeok Deolkeok
From an onomatopoeia for bumping between hard and big objects.
Portuguese (NOE) Volta-face From voltar (to turn) and face (face)