すべての行と列に3つのチェックマークを追加します。
You need to place three check marks in every row and column. Check marks are never adjacent to each other, neither horizontally nor vertically.
Contains 365 levels, one for each day of the year.
Last updated on 2020年01月09日
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Daily Check It
2.2 by Zygomatic
2020年01月09日