Loopki

Draw a single loop consisting of vertical and horizontal segments between dots that does not touch or cross itself. For each cell, this loop visits a certain number of corners and edges. If there is a black dot in a cell, one of these numbers is equal to the other number multiplied by two. If there is a white dot in a cell, the two numbers are consecutive. If there is no dot in a cell, neither of these conditions applies.

loopki-example

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