Logic Masters Deutschland e.V.

Sudoku Variants Series (237) - Before 1 - After 9 Sudoku

(Published on 14. August 2018, 00:00 by Richard)

For this Sudoku Variants Project I have planned to publish a different Sudoku variant every second Tuesday. I will see how long it takes before I am running out of ideas.

Before 1 - After 9 Sudoku
Apply classic sudoku rules. Numbers outside the grid indicate the sum of all digits placed before the 1 (top/left clue) or after the 9 (bottom/right clue) in the respective row or column.

Inspiriation for this type comes from Sudoku GP 2014 Round 2, Serbia.

Solve online in Penpa+ (thanks glum_hippo!)

Solution code: Row 2, followed by column 3.

Last changed on on 4. November 2021, 05:44
Solved by jirk, Joe Average, r45, azalozni, Julianl, Senior, zorant, Matt, zuzanina, sloffie, flaemmchen, Statistica, TashaYar, swotty, ch1983, marcmees, tuace, sf2l, moss, Uhu, Luigi, AnnaTh, Laje6, rcg, ... bonked, polar, glum_hippo, Krokant, Danielle, misko, Nick Smirnov, bbutrosghali, Kulko, snowyegret, TomBradyLambeth, Angelo, Nylimb, AMD, Nickyo, mjozska1985, Just me, juventino188, SKORP17
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Comments

on 4. November 2021, 05:44 by Richard
Added link for online solving. Thx glum_hippo!

on 4. May 2021, 17:15 by glum_hippo
Fascinating variant! Here it is in penpa with automated answer check - Richard, please delete if you don't want an interactive version: https://git.io/J3awg

on 14. August 2018, 19:54 by Matt
thanks, didn't see this all the time :-(

on 14. August 2018, 19:10 by Statistica
@Matt: You have two 8 in the first column.

on 14. August 2018, 14:08 by zorant
No puzzle have not two solutions.
And I make the same mystake. deleted all and try again with a little change

Difficulty:3
Rating:90 %
Solved:105 times
Observed:10 times
ID:0002VQ
Puzzle variant Online solving tool
Sudoku

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Solution code:

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