This puzzles uses the digits 1-9 as normal; however, some of those digits are negative for the purpose of calculating cage totals and inequalities. (Any negative digits will be negative in every cage and on every inequality in which they appear.)
Play online:
F-puzzles
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Penpa+
Solution code: Row 5, then column 5 (18 digits, no spaces).
on 10. June 2023, 10:41 by annaswan
This was beautiful! The initial math took me quite a while to figure out (I'm not sure if you're supposed to deduce the sets of positive and negative numbers before you start, but I did) but everything after flowed really nicely and the puzzle as a whole fit together beautifully.
on 1. March 2022, 16:12 by Playmaker6174
A lovely and fun solve once I got the opening and the things afterwards :)
on 27. February 2022, 04:20 by twobear
Very fun puzzle. Thank you!