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at each stage and the difficulty of the strategy that grants each solution. An easier puzzle will have many places where a logical deduction can place a solution or eliminate a candidate number. When the whole puzzle is assessed in this way, plus some heuristics, a score can be determined. Over a
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A hand made prototype of Str8ts which used black cells and the new rule of straights in compartments was invented by
Canadian puzzle designer Jeff Widderich in 2007. He approached Andrew Stuart, a UK-based puzzle maker and programmer, to make the puzzle. Their collaboration settled how the clues
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in
February 2008. A daily puzzle has been published at their website since 24 November 2008, and more recently, a weekly "extreme" puzzle has appeared, which incorporates an active discussion forum for each puzzle. The puzzle has appeared in
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Like Sudoku, the solver must fill the remaining white cells with numbers 1 to 9 (or 1 to n in puzzles with N cells per side) such that each row and column contains unique digits. Whereas Sudoku has the additional constraint of 3x3
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In August 2010, a wooden board and piece version was designed by
Intellego holzspiele. Widderich appeared with the game in the fifth season of the Canadian television show
46:. The puzzle is published in a number of newspapers internationally, in two book collections, and in downloadable apps. It was featured on the Canadian television show
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on
November 24, 2010, where he made a deal for a $ 150,000 investment in return for 10% royalties, from three of the panelists.
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There are a number of variants to the basic game, including
Symmetric Str8ts, Asymmetric Str8ts, Mini-Str8ts, and Transformations.
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the puzzle can demonstrate a wide spectrum of relative difficulty. The grade is determined by a combination of
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app was released in July 2009, containing hundreds of puzzles in four difficulty levels.
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of scores can be produced. This can be quartiled to group puzzles into specific grades.
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would be determined and finalized the rules. The first puzzle was presented at the
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The solver is given a 9x9 grid, partially divided by black cells into
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243:. Boardgamenews. August 13, 2010. Retrieved November 24, 2010.
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109:. Each compartment, vertically or horizontally, must contain a
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296:"Numbers game needs to grow before Dragons will buy in"
267:"Victoria puzzlemaker starts a frenzy on Dragon's Den"
132:As Str8ts belongs to the same class of puzzles as
156:STR8TS - Das neue Zahlenrätsel mit Suchtpotential
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253:Dragons' Den - Pitches - Str8ts - CBC Television
255:. Season 5, Episode 8. Retrieved Mar 30, 2015.
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172:, Süddeutsche Zeitung Verlag, München 2010,
209:"Saanich puzzlemaker impresses the Dragons"
241:Str8ts - A Sudoku Challenger Gone to Board
198:. April 2010. Retrieved November 24, 2010.
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141:large number of puzzles (>10,000) a
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168:Jeff Widderich & Andrew Stuart:
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63:Nuremberg International Toy Fair
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42:. The name is derived from the
265:Andrew A. Duffy (2010-11-26).
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101:Solution to the sample puzzle
302:. 2010-11-29. Archived from
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211:. Saanich News. 2010-11-25
196:Str8ts 9x9 Sample Document
367:Recreational mathematics
229:Str8ts iPhone App Review
34:-based number-placement
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184:References
143:bell curve
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93:Gameplay
128:Grading
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134:Sudoku
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