Sujiken
A right-triangle Sudoku where rows, columns, diagonals and blocks share digits.
Controls
Fill the right-angled triangle with digits 1–9. No digit may repeat in a row, column or diagonal of any length, and the three 3×3 square blocks and three large triangular blocks must each stay unique. Tap a cell, choose a number, and use Clear or the answer button as needed.
Logic · Numbers · Deduction · Grid · Region
Brain training · PuzGo