Rules of Twin Corresponding Sudoku
Fill in the grids so that every row, every column and 3x3 box contains the digits 1 through 9. There must be a one-to-one correspondence between both twins, i. e., in all positions with a certain digit in the first grid must be in the corresponding position in the second grid also always the same digit (possibly another as in the first grid).
Tips for solving Twin Corresponding Sudoku:
Look for corresponding cells that are already filled in. This can give you some clues about the numbers that go in other cells.
Use the Sudoku rules to eliminate possibilities. For example, if you know that a row must contain the number 6, and you know that the corresponding cell in the other grid contains the number 2, then you can eliminate the numbers 6 and 2 from all of the other cells in that row.
Try solving one grid at a time. Once you have solved one grid, you can use the corresponding cells in the other grid to help you solve the other grid.