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Number: Puzzle #1789
Genre: Fences
Author: mathgrant
Appeared at: March 17, 2010

I mentioned this when the puzzle appeared on my blog, but I thought I'd mention it here: this puzzle is antisymmetric. All of the 0's and 2's are symmetrically opposite one another, and all of the 1's and 3's are symmetrically opposite one another. This was inspired by Bram's puzzle at http://www.puzzlepicnic.com/puzzle?1711 , which has a similar kind of antisymmetry, with 0's opposite 3's and 1's opposite 2's.