Adults (18-64): 16x16 grid, 15 words, all 8 directions with backwards/diagonals, hard Sudoku.
📐 Official Amazon KDP Print Specs
100% KDP COMPLIANT
Inside Gutter: 0.375 in
Outside Margin: 0.375 in (Safe)
Calculated Spine: 0.243 in
Full Cover Size: 17.493" × 11.25"
✓ Spine Text Eligible (108 ≥ 79 pages requirement)
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