There is a purely logical solving path, which however makes heavy use of arithmetical tricks.
The puzzle is also available online with Penpa-edit.
Solution code: Row 3 and 7
on 21. September 2021, 10:29 by William Cheese
Easy, and nice!
on 3. July 2020, 08:39 by Mosti_Mo
Richtig heftig und gleichzeitig schön :) Dankeschön :)
on 1. July 2020, 18:14 by mandourin
Fantastic puzzle. The break-in was "something else".
on 1. July 2020, 14:58 by cdwg2000
Very good entrance!
on 1. July 2020, 08:31 by ahaupt
Many thanks for all the nice feedback. I'm very happy you all enjoyed it!
on 1. July 2020, 02:00 by emmettcito
This has to be one of the most fantastic puzzles I have ever solved. It remained consistently difficult throughout the solve, and I was especially impressed with the initial trick. Well done!
on 30. June 2020, 21:48 by zhergan
Very nice and challenging. Thanks..
on 30. June 2020, 20:33 by MartinR
Lots of arithmetic, but lots of fun :)
on 30. June 2020, 18:59 by ahaupt
Wenn jemand einen Hinweis für den Start möchte, dann schreib doch einen versteckten Kommentar und ich werde darin antworten.
If somebody wants to have a hint for the beginning, then please write a hidden comment in which I will answer.