Sum Mark

Rang Do

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About this game

Sum Mark is a pure and classic sudoku number logic puzzle game. Fill the blank grid cells with correct numbers following standard sudoku rules, ensuring every row, column and sub-grid contains unique digits. Multiple difficulty levels are available for beginners and advanced puzzle lovers. Featuring a clean minimalist interface, convenient number operation and thoughtful hint functions, it provides calm intellectual training. Effectively exercise logical reasoning and digital sensitivity for daily brain relaxation.