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An enhanced but simultanuously reduced version of Rashkey.
Turn Four is based on an idea by Sjaak Griffioen. Sjaak wanted nine squares in a 3x3 grid, where any combination of 2x2 could be rotated by multiples of 90 degrees. Wim Zwaan built him a wooden prototype where one could lift out four square with your fingers. Whereas the puzzle worked, it was very easy to cheat by flipping the puzzle over and place the pieces. This version, designed by Oskar van Deventer, is more of a classic twisty puzzle with no cheating possibility.
The cutting pattern is identical to the Rashkey. Unlike those puzzles there are four circles intersecting with each other and only the square pieces are relevant for the solution. Unlike Rashkey the squares have a visible orientation.
Width: 109 mm
Height: 27 mm
Weight: 120 grams
In 2021 Oskar presented another version with Lego dolls instead of numbers. See images 7-8.
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