Prime Magic Block Checker - Professional Hierarchical Edition

The coloring modes are separate. Whole-square concentric mode adds no block separators. Block mode adds no whole-square concentric rings. Block-concentric mode colors concentric rings only inside each selected block; thick colored lines separate neighboring concentric blocks, while internal ring borders remain thin. Blocks-and-sub-blocks mode uses two independent sizes; check "Sub-block: separate inner region" to color each sub-block as a 1-cell border ring plus one solid interior color instead of one flat color — for example, main blocks of order 20 divided into a 4×4 grid of 5×5 sub-blocks, each 5×5 shown as a border ring around one solid 3×3 center; or order 18 into 3×3 of 6×6, each 6×6 as a border ring around a solid 4×4 center. Hierarchical mode adds an optional third level, for example 20×20 → 10×10 → 5×5. The external-border mode first separates a centered internal square, then divides only that internal square into blocks; for example 10 → inner 8 → 4×4, or 14 → inner 12 → 3×3/4×4, or 19 → inner 15 → 3×3/5×5. The nested "blocks with their own border" mode applies that same border-then-blocks idea to EACH block individually — for example, main blocks of order 10, each with a 1-cell border around its own centered 2×2-of-4×4 region (set Main block order=10, Centered internal order=8, Blocks inside internal part=4). Examples: 40×40 divided into 10×10 blocks; 32×32 divided into 8×8 or 4×4 blocks. The Excel block and sub-block settings are now checked independently of the Internal block orders field.