Number tetrominoes where every row and column sums to 15
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問題 1 / 50 ・ 4×4 ・ クリア 0 / 50（0%）
ピースを選んで回転→盤をクリック（ドラッグでも配置）。全行・全列を15に。
The board is generated so every row and column already sums to 15, then cut into tetrominoes — so a solution always exists. Numbers may repeat and no 1–9-per-box rule applies. Boards grow larger over the set, and 50 puzzles refresh each month.
