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SudokuXV puzzle
This is an example of a completed SudokuXV grid. A SudokuXV puzzle uses the same base rules of Sudoku, but in addition some cells will have a 'V' or a 'X' between them. In the case of a 'V', these two cells will add to 5, and in the case of a 'X', these two cells will add to 10.
If you look at this puzzle, you can see that these rules are satisfied.
SudokuXV puzzle
This is an example SudokuXV starting grid, and I have highlighted some cells that we can either fill in, or insert some pencil marks. In the topmost cell, it is linked to a '4' by a 'X' symbol. The 'X' tells us that these two cells must add to 10, so the highlighted cell must be a '6'.
Slightly lower we have another highlighted cell linked by a 'V' to a 1. These two cells must add to 5, so the highlighted cell must be a 4.
At the bottom of the puzzle we have two highlighted cells linked with a 'V'. We know these two cells must add to 5, and there's only two ways we can do that, either 1+4=5, or 2+3=5. Because of the 1s and 4s already in these two rows we know that we can't have the combination of 1 and 4 in these cells. We can then fill in the pencil marks of 2 and 3 for these two cells.
SudokuXV puzzle
This is another starting SudokuXV grid, can you fill in the highlighted cells? The set of 3 cells in the bottom right can be filled (i.e. not with pencil marks), hint: Consider the 'V' clue first, and then consider what possibilities that would leave for the 'X' clue.

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