Quad Max
Solve online in Penpa+ (thx Nick Smirnov!)
Place the digits from 1 tot 9 in every row, column and 3x3-block. An arrow in a circle points to the highest digit in the four neighbouring cells.
Solution code: Column 1, followed by column 4.
on 14. July 2022, 10:30 by Richard
Added link and tag for online solving. Thx Nick!
on 6. September 2021, 12:12 by Nick Smirnov
Penpa:
https://git.io/Ju3ts
on 28. June 2016, 02:07 by ohm0123
Cool. So good. Thanks.
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