United Sudoku Triples Sunday by Knight Features
Sudoku Triples consists of three standard Sudoku panels, sharing one set of 3x3 boxes. Each row, column and 3x3 box must contain the numbers 1-9 with no repeats. Each 3x3 box in the shared section of the three panels is filled in identically. Therefore, finding a number in one box in the shared section advances the other three boxes.