数独チュートリアル
4×4盤面で基本テクニックを順番に練習します。
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Practice by techniqueJump straight to the technique you want to repeat with the same explanation and board.
Naked single — one cell, one answer
The highlighted row already shows three of the four digits, so the empty cell has exactly one candidate left. Place it.
row 1
Tap the highlighted cell (or press 1–4) to place the answer this step is teaching.