Magic Square

op: puzzles.magic_square.solve

N×N grid filled with distinct values 1..N² so that every row, column, and main diagonal sums to the magic constant N(N²+1)/2. Substrate-native distinct + line-sum projection.

size N

magic constant = 15

Note: N=4 takes longer (~10s+) and N=5 is at the edge of brute-force feasibility for this solver.