This is an example of a completed Vudoku grid.
The usual rules of Sudoku apply, but there are also 'V' symbols on the grid.
There are 3 cells covered by any 'V' clue, 2 of them (any 2) must add to give the value of the third cell.
You will sometimes find there are overlapping 'V' clues (as is the case in the top-center region), you can treat this as 2 separate 'V' clues
and apply them independently.