SUDOKU EVIL THIEP 150 With "The 4-Cell Rule"

-"QUY TẮC 4 Ô": có giải thích trong SUDOKU-EVIL-THIEP-100.
-I know some of you are wondering, "How did he put the correct number in that cell?" I explained in SUDOKU-EVIL-THIEP-100.
-Uploaded SUDOKU-EVIL-THIEP-100. With "The 4-Cell Rule" (English Subtitle).

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