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Towers

Each row and column must contain 1–5 once. Edge numbers say how many towers are visible from that side — a taller tower hides any shorter one behind it.

Auto pencil-marks Auto-answer singles

Click a cell, then 1–5 to fill, Shift+1–5 to toggle a pencil-mark. 0/Backspace erases the answer (or candidates when the cell is empty).