Pentominoes in White
Place identical pentominoes into the grid. The pentominoes may be rotated and reflected, but they cannot touch each other, not even diagonally. Then blacken the unused cells. The numbers outside the grid indicate the lengths of blocks of blackened cells. If there are more numbers in one row/column, there must be at least one white cell (part of the pentomino) between two blocks of blackened cells. The numbers outside the grid are given in increasing order.
(Rules and example (2 Ws) from WPC 2016 IB)
- As for all the other polyomino puzzles, some rulesets allow reflection, while others don't. The original from WPC 2012/Part 5 forbade reflections.