Put some pairs of polyominos in the grid so that each polyomino has one clue inside it. The paired polyominos will touch each other by at least one side, and a pair of polyominos cannot touch another pair of polyominos by a side. A clue in a polyomino shows the shape of the other polyomino of the pair with no rotation or reflection.
(Rules and example from WPC 2017 IB)
History of the puzzle
Probably first appeared on No Numbers, held by Ko Okamoto (Japan) in May 2012. In Japanese, this puzzle is called 愛のカタチ (Ai No Katachi), which can be translated as "shape of love".
Appearances in the past WPCs
- WPC 2017/Round 13 by Prasanna Seshadri