A Very Tough Puzzle
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Match the sides as you put together the pieces in the pink 4×4 square.
Contributed by: Eric Gu (March 2011)
Open content licensed under CC BY-NC-SA
This a modification of Kaliko and was originally patented as one of the MacMahon square sets back in 1926. See "More about edgematching".
Based on The Ultimate Puzzle by YMIR, Inc.
"A Very Tough Puzzle"
Wolfram Demonstrations Project
Published: March 7 2011