Clue-numbers in grey cells are identical in both grids, numbers in white cells must be different in both grids.
Solution code: 1. The used pentominos in the left grid, in alphabetic order. 2. The sizes of the areas outside the loop, clockwise, starting top left in the right grid.
on 19. May 2022, 17:40 by Nick Smirnov
Penpa:
https://tinyurl.com/y3ln2qwj
on 8. July 2014, 21:05 by sternchen
Das Rätsel hat mir sehr gut gefallen...danke!
on 6. July 2014, 13:46 by pin7guin
Das ist mal ein richtig wunderschönes Pentominorätsel!
on 5. July 2014, 22:36 by HaSe
very nice, Richard
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