Join dots into a single loop that never crosses or splits. Each number says how many of its four sides the loop uses - pure logic, and you never count past three.
How to play
Join dots with straight lines to make one continuous loop. Each number tells how many of the four sides around it the loop uses: a 3 uses three sides, a 0 uses none. Blank cells can use any number of sides. The finished loop is a single ring that never crosses itself and never branches off.
Copies
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Sheet code:
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Preview
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