Some grid has zones with unique rules (e.g., only odd numbers, no repeating numbers diagonally, or specific sums per row/column). Visual themes (forest, space, ancient ruins) enhance immersion and provide clues.
Some grid has zones with unique rules (e.g., only odd numbers, no repeating numbers diagonally, or specific sums per row/column).
Visual themes (forest, space, ancient ruins) enhance immersion and provide clues.