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The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.
Original – The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures. It depicts two arrangements of shapes, each of which apparently forms a 13×5 right-angled triangle, but one of which has a 1×1 hole in it.
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Swap figures so missing square is below: 07:11, 20 January 2023: 512 × 683 (444 bytes) Cmglee
The challenge is to paint each cell black or white, subject to the following rules: Each numbered cell is an island cell, the number in it is the number of cells in that island. Each island must contain exactly one numbered cell. There must be only one sea, which is not allowed to contain "pools", i.e. 2×2 areas of black cells.
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If you've just passed an image challenge, but are immediately prompted by another, there may be an issue with your browser. Before you attempt another image challenge, clear the cache on your web browser. If you're still prompted to retake the image challenge multiple times a day, you might have a more serious issue.