Magic Square

The timeless number puzzle. Fill the grid with each number from 1 to N² exactly once so that every row, every column and both diagonals add up to the same magic constant (15 for a 3×3, 34 for a 4×4). A handful of cells are given; pure logic fills the rest. Live sum readouts on every line — and a satisfying green flash when one lands exactly on the target — guide you in.

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