400 Tridoku Sudoku Puzzles: Hard Triangular Sudoku Puzzles: Volume 12 (Tridoku Puzzles)

400 Tridoku Sudoku Puzzles: Hard to Very Hard Triangular Sudoku Puzzles: Volume 16 (Tridoku Puzzles)

Triangular Sudoku: 150 TriDoku puzzles: 2 (Triangular Spatial Deduction: The Complete TriDoku Architecture)

TriDoku: 150 Triangular Sudoku Puzzles: Volume 2 (Triangular Spatial Deduction: The Complete TriDoku Architecture)

Tridoku Hard 200 Puzzle With Solution Vol 4: Triangle Sudoku variant, 2 puzzles per page