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This series is shared a the puzzle palace, under the name Square Dot.
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Mark Richardson (Hand-e-food)'s Twinkle Twinkle Little Square is a cute game based on the same rules.
Acknowledgements and Changes
2021-10-05 Thanks to Martin Ender (Menderbug) for suggesting not drawing partial squares.
2024-08-15 A bug detected by PinkHoodie no longer occurs since the proper input mode was restored - thank you.
2025-03-27 A bug detected by 5381 was corrected (cause: off-vertex visited circles were not excluded)