This is an Off by One Yajisan-Kazusan.
The rules for Yajisan-Kazusan can be found here: Rules page
In addition to the usual rules for Yajisan-Kazusan, every unshaded number is incorrect. They should be one higher or one lower than the written number.
Simply Unbelievable
Simply Unbelievable
Simply Unbelievable
Regular puzzles, Sudokus, and more. Please see the About the Blog page for details.
Simply Unbelievable
Simply Unbelievable
Simply Unbelievable
Now posting new content at http://www.gmpuzzles.com/blog/
Simply Unbelievable
Jamie's Deceptive Puzzles 
Excellent puzzle, thank you.
I particularly liked gur hfr bs cnevgl, as well as gur zhygvcyr fcbgf jurer lbh arrq gb znxr qrqhpgvbaf onfrq ba gur rkvfgrapr bs n oynpx mvtmnt rira gubhtu lbh pnaabg lrg gryy juvpu bar (bhg bs gjb cbffvoyr zveebe vzntrf) oynpx mvtmnt gung vf.
Looking forward to another YK toughie on Friday!
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