The letters W, X, Y and Z are to appear twice in every row and column and once in every 2x2 box.
From the given starters, can you finish the puzzle?
X | | | | W | | W | | |
| W | Y | | | Y | | | |
| | | | | | | Z | |
| X | X | | | W | | | |
Z | | W | | W | | | Z | |
| | | Y | | | | | |
| | | | | | | Y | |
| X | W | | | Y | X | | |
(In reply to
Solved in queue by jduval)
Thanks to you all for responding.