From grid size to cell count
The cell count is the side length squared. A 3×3 has 9 targets, a 5×5 has 25, and a 10×10 has 100. A larger total time on a larger grid does not by itself show slower per-target performance.
- 3×3 = 9; 4×4 = 16; 5×5 = 25; 6×6 = 36
- 7×7 = 49; 8×8 = 64; 9×9 = 81; 10×10 = 100
- Keep totals grouped by grid size before reviewing a trend
