The Skewb (//) is a combination puzzle and a mechanical puzzle in the style of the Rubik's Cube. It was invented by Tony Durham and marketed by Uwe Mèffert. Although it is cubical in shape, it differs from Rubik's construction in that its axes of rotation pass through the corners of the cube rather than the centres of the faces. There are ten such axes, one for each space diagonal of the cube. As a result, it is a deep-cut puzzle in which each twist affects all six faces.
Mèffert's original name for this puzzle was the Pyraminx Cube, to emphasize that it was part of a series including his first tetrahedral puzzle, the Pyraminx. The catchier name Skewb was coined by Douglas Hofstadter in his Metamagical Themas column, and Mèffert liked it enough not only to market the Pyraminx Cube under this name but also to name some of his other puzzles after it, such as the Skewb Diamond.
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Despite a simple appearance, its pieces are actually divided into subgroups and have restrictions that are apparent upon examining the puzzle's mechanism. The eight corners are split into two groups—the four corners attached to the central four-armed spider and the four "floating" corners that can be removed from the mechanism easily. These corners cannot be interchanged i.e. in a single group of four corners, their relative positions are unchanged. They can be distinguished by applying pressure on the corner—if it squishes down a bit, it's a floating corner. The centers only have two possible orientations—this becomes apparent either by scrambling a Skewb-alike puzzle where the center orientation is visible (such as the Skewb Diamond or Skewb Ultimate), or by disassembling the puzzle.
The world record average of 5 (excluding fastest and slowest) is 2.03 seconds, set by Łukasz Burliga of Poland on 17 December 2017 at CFL Santa Claus Cube Race 2017 in Bełchatów, Poland, with the times of 2.48 1.91 1.71 1.39, and 4.98 seconds.
|Andrew Huang||0.93s||WCA World Championship 2019|
|Leo Min-Bedford||0.97s||Selangor Cube Open 2019|
|Carter Kucala||1.02s||Minnesota Cube Days 2020|
|Daniel Vædele Egdal||1.04s||Tårnby Cube Træf 2019|
|Jonatan Kłosko||1.10s||ŚLS Wodzisław Śląski 2015|
|Łukasz Burliga||2.03s||CFL Santa Claus Cube Race 2017|
|Michał Rzewuski||2.13s||III Masovian Open 2019|
|Michał Krasowski||2.23s||LLS VI 2018|
|Rasmus Stub Detlefsen||2.28s||WCA Euro 2018|
|Yanchen Zhu (朱彦臣)||2.32s||Chengdu New Year Afternoon 2021|
- "Tony Durham Mechanical Puzzles". The Metagrobologist. Retrieved September 22, 2020.
- "Jaap's Puzzle Page, Skewb Page". Jaap's Puzzle Page.
- Master Skewb
- Elite Skewb
- "Add Skewb. Resolves issue #102. · thewca/wca-regulations@66d6da9". GitHub. Retrieved 2021-01-26.
- World Cube Association Official Results - Skewb
- World Cube Association Official Skewb Ranking Single
- World Cube Association Official Skewb Ranking Average