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Sudoku
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=== Other variants === Puzzles constructed from more than two grids are also common. Five 9Γ9 grids that overlap at the corner regions in the shape of a ''[[quincunx]]'' is known in Japan as ''Gattai'' 5 (five merged) Sudoku. In ''The Times'', ''[[The Age]]'', and ''[[The Sydney Morning Herald]]'', this form of puzzle is known as Samurai Sudoku. ''[[The Baltimore Sun]]'' and the ''[[Toronto Star]]'' publish a puzzle of this variant (titled High Five) in their Sunday edition. Often, no givens are placed in the overlapping regions. Sequential grids, as opposed to overlapping, are also published, with values in specific locations in grids needing to be transferred to others. [[File:Comparison Sudoku.png|thumb|250px|An example of Greater Than Sudoku]] A tabletop version of Sudoku can be played with a standard 81-card Set deck (see [[Set game]]). A three-dimensional Sudoku puzzle was published in ''[[The Daily Telegraph]]'' in May 2005. ''The Times'' also publishes a three-dimensional version under the name Tredoku. Also, a Sudoku version of the [[Rubik's Cube]] is named [[Sudoku Cube]]. Many other variants have been developed.<ref>{{cite book |last1=Snyder |first1=Thomas |last2=Huang |first2=Wei-Hwa |title=Mutant Sudoku |publisher=Puzzlewright Press |year=2009 |isbn=978-1-402765025}}</ref><ref>{{cite book |last=Conceptis |first=Puzzles |title=Amazing Sudoku Variants |publisher=Puzzlewright |year=2013 |isbn=978-1454906520 |oclc=700343731}}</ref><ref>{{cite book |last=Murali |first=A V |title=A Collection of Fascinating Games and Puzzles |publisher=CreateSpace Independent Publishing |year=2014 |isbn=978-1500216429 |oclc=1152132274}}</ref> Some are different shapes in the arrangement of overlapping 9Γ9 grids, such as butterfly, windmill, or flower.<ref name="ja1">{{cite web |url=http://www.janko.at/Raetsel/Zahlenraetsel.htm |title=Zahlenraetsel |website=janko.at}}</ref> Others vary the logic for solving the grid. One of these is "Greater Than Sudoku". In this, a 3Γ3 grid of the Sudoku is given with 12 symbols of Greater Than (>) or Less Than (<) on the common line of the two adjacent numbers.<ref name="Garns"/> Another variant on the logic of the solution is "Clueless Sudoku", in which nine 9Γ9 Sudoku grids are each placed in a 3Γ3 array. The center cell in each 3Γ3 grid of all nine puzzles is left blank and forms a tenth Sudoku puzzle without any cell completed; hence, "clueless".<ref name="ja1"/> Examples and other variants can be found in the [[Glossary of Sudoku]].
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