#A13: Circles and Squares

 Petition to rename this genre to "River and Squares." It's versatile in that it flows well in small spaces and can expand into large ones. It also has the funny opportunity for a square grid of only white circles (not being allowed as a solution), which I used in previous puzzles but not these. 

https://puzz.link/p?circlesquare/5/5/a03600i00

https://puzz.link/p?circlesquare/6/6/919102006300

https://puzz.link/p?circlesquare/7/7/01310a01001092000

https://puzz.link/p?circlesquare/12/13/00903d0331013d0039003d1c000000ac039309ac009330ac0100

Variant: Get 5 simultaneous error messages.

https://puzz.link/p?circlesquare/v:/4/2/i03

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