Sudoku Triplet is a puzzle consisting of three regular Sudoku grids, sharing one set of 3x3 boxes.

Each row, column and set of 3x3 boxes must contain the numbers 1-9.

The numbers in the set of highlighted 3x3 grids, which are shared by all three of the 9x9 grids, are filled in identically. Therefore finding a number in the shared set of 3x3 numbers from one of the Triplets advances the other Sudokus as well.