Read the Sudoku help page for the rules, and the techniques potentially required to solve BrainBashers Sudoku.

An XYZ-Wing is a very advanced technique which can eliminate certain candidates from squares and is a very similar technique to XY-Wing.

We are looking for three squares. This time the first square contains **XYZ** and we require a buddy of this square to contain **XZ**. We then require another buddy of the **XYZ** square to contain **YZ**.

Any squares that are buddies to **all three squares**, **XYZ**, **XZ** & **YZ** cannot contain **Z**. Why? Because no matter which way around the digits go, the **Z** will be in one of the three squares.

In this Sudoku

**X**=7,**Y**=8 &**Z**=9. R4C4 is**XYZ**. R4C2 is**XZ**. R6C4 is**YZ**. So no buddies of all three squares R4C4, R4C2 & R6C4 can contain <9>.In this Sudoku

**X**=6,**Y**=3 &**Z**=2. R8C8 is**XYZ**. R8C2 is**XZ**. R9C8 is**YZ**. So no buddies of all three squares R8C8, R8C2 & R9C8 can contain <2>.**Note:** BrainBashers has a Dark Mode setting.