7 in the corner
(Published on 12. April 2026, 00:21 by Plok)
I always try to keep a minium set of rules as simple as possible. So just XV and a 3 in the corner.
I Hope you like it as much as I did.
Any feedback is highly appreciated.
You can play the puzzle in Sudokupad
Rules:
- Normal 7×7 Sudoku rules: each row, column, and region contains the digits 1–7.
- XV pairs: digits separated by a V sum to 5; digits separated by an X sum to 10. No negative constraint.
- There is at least a 3 in the corner.
Solution code: The last 4 digits in the last row
Comments
today, 05:25 by CitrusGremlin
I might have done something wrong because I didn't need the 3 in the corner rule at all.
on 12. April 2026, 22:14 by mikebolt
I used some star battle (aka two not touch) techniques to help solve this. Jigsaw sudoku variants are great.
on 12. April 2026, 21:22 by hundertzwoelf
Very nice 1* coloring :)
on 12. April 2026, 17:59 by wuc
Great lower 2* snack. Great coloring practice. Maybe at least a 3in the corner was clearer. Great setting thx.
on 12. April 2026, 16:14 by Plok
Updated link to sudokupad with clearer instructions.
on 12. April 2026, 15:00 by superkinkel
The rules on Sudokupad say there is a 3 in „one corner“. That‘s confusing the rule as stated here is clearer.
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Thanks for the heads up. Fixed it correctly now.
on 12. April 2026, 12:05 by firespire
7x7 puzzles are rare, fun doing things with a new twist.
on 12. April 2026, 10:11 by wuc
Great lower 2* snack. Great coloring practice. Maybe at least a 3in the corner was clearer. Great setting thx.
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Thank you. You can solve it without coloring, which makes the puzzle a bit more challenging, I updated the rules.
on 12. April 2026, 07:28 by nightdream
Really enjoyable puzzle! The coloring was satisfying and not too tricky, and we always love a 3 in the corner :)
on 12. April 2026, 02:45 by Freegerator
Thanks for the puzzle!
A while back I thought it’d be fun to have a required three in the corner for a puzzle too but mine was on the opposite end of the difficulty spectrum. This is a much clearer use :)
(https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=000ORT in case you’re curious)
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Thank you! I looked for an original way to disambiguate and the fireworks always make me smile ;-)
on 12. April 2026, 02:13 by wuc
Great lower 2* snack. Great coloring practice. Maybe at least a 3in the corner was clearer. Great setting thx.
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Thank you. I updated the rules.
on 12. April 2026, 01:36 by rojspencer
A nice challenge. Would have finished sooner if I didn't forget the 3 in the corner rule.
