Free Play
Sunstone Sovereign
★★★★★
- Normal sudoku rules apply: fill every row, column, and 3×3 box with 1–9.
- Orthogonally adjacent cells cannot contain consecutive digits.
- Every three consecutive cells on a line contain one low (1–3), one middle (4–6), and one high (7–9) digit.
- Every three consecutive cells on a line contain three different remainders mod 3.