Each row, column and 2x2 box contains the digits 1 to 4 once each.
Digits in arrow circles are each the sum of the digits in the arrow from that circle.
Solution code: All digits in row 3 from left to right.
on 14. February 2024, 16:00 by permafrostyx
nice baby puzzle sir even if its a bit kaizo
on 20. January 2024, 01:30 by SimplePurpleFrog
Link to Anti Knight - Thermo
on 16. January 2024, 19:51 by ave
Hm, had to think, it's not just a write in.
on 19. December 2023, 14:29 by shye
this is asking a lot of a beginner to be honest, i dont think the fact that its a 4x4 magically makes it okay
SPF> I am honoured to receive a comment from you, Shye. If by beginner I had meant 'absolute beginner', I would agree with you. However I mean 'beginner in the world of alternative sudoku constraints', and I do assume classic sudoku knowledge. With this nuance I hope you may agree that it is an adequate title for this puzzle series.
on 29. November 2023, 03:21 by SimplePurpleFrog
Link to Little Killer
on 27. October 2023, 05:31 by Tingo
This is another fun puzzle. Thanks for setting and sharing!
on 22. October 2023, 02:55 by SimplePurpleFrog
Added link to RC indexing
on 21. October 2023, 02:39 by SimplePurpleFrog
Added link to thermo-renban
on 19. October 2023, 23:56 by SimplePurpleFrog
Added link to anti-knight kropki
on 17. October 2023, 18:23 by SimplePurpleFrog
Link to arrow-thermo
on 17. October 2023, 02:30 by SimplePurpleFrog
Added link to killer sudoku
on 16. October 2023, 02:16 by SimplePurpleFrog
Added link to Kropki sudoku