Tridoku
A large triangular Sudoku with nine regions, outer edges, inner legs and touching rules.
Controls
Fill the large triangle with 1–9. Each of the nine bold triangular regions, the three outer edges and the three inner legs must contain every digit exactly once. Identical digits may not touch even at a corner. Tap a triangular cell, choose a number, then use Clear or the answer button when needed.
Logic · Numbers · Deduction · Grid · Region
Brain training · PuzGo