4 x 4 x 4
(Published on 21. September 2024, 15:50 by marty_sears)
Rules:
In each grid, normal 4x4 sudoku rules apply.
The grids are numbered 1-4 in normal reading order.
2x2 boxes within each grid are numbered 1-4 in normal reading order.
Cells within each 2x2 box are numbered 1-4 in normal reading order.
Reading along a coloured line (starting at the end with the invisible bulb), the digits WXYZ indicate that in grid W, box X, position Y, a digit Z should be placed.
Every line indexes a different cell, which always happens to be located somewhere on a line.
Click here to play on Sudokupad
Please leave a comment if you enjoy :)
Solution code: The four corner cells nearest the puzzle's centre point, in normal reading order
Comments
on 29. December 2024, 03:01 by bumperchip
took me a lot of guessing and some time to understand the rules (im a beginner) but omg i loved this so much!
on 24. December 2024, 14:59 by CFood
spent 90 minutes trying to read, spent maybe 5 minutes doing the actual puzzle once i actually started doing it
i foolishly assumed each line was self indexing as well as grid indexing, that is NOT what "each line indexes a different cell" means. idk how i came to that conclusion
on 18. November 2024, 03:16 by ecmbeanie
I also missed that you have to find the invisible bulb...even after reading the comments! Very nice easy puzzle with a solve path that shows how intentional the setting is.
The rules made me realize how weird it is that as a mathematician, I think W should come after Z when using variables.
on 1. November 2024, 20:44 by Cosinus
Surprisingly easy ;)
on 30. October 2024, 15:04 by faltenin
Wow that was pretty amazing - I thought I had messed up and re-read the instructions... invisible bulbs!
on 27. October 2024, 13:28 by BabyfacedBard
Honestly sort of mind blowing to me. Love it
on 1. October 2024, 14:46 by davidemsa
Very cool puzzle. The way it works out is so satisfying.
on 29. September 2024, 22:44 by ChinStrap
Beautiful, surprisingly approachable. Great little indexing snack!
on 29. September 2024, 01:17 by jojo81gaming
Once I learned how to read this was wonderful to solve
on 26. September 2024, 21:08 by henryng
Really interesting puzzle—I'd say it didn't feel like doing sudoku at all, but some other kind of puzzle. Very satisfying
Marty: ahhh thankyou i'm glad you enjoyed it. And love 3blue1brown :)
By the way—I watched the 3blue1brown video about Hamming codes recently, and the patterns in this puzzle reminded me of it. A clearer head than mine might be able to make a stronger connection there!
on 23. September 2024, 04:27 by konklone
Wow! That was really striking, and while not hard, not totally trivial either and made you think at each step.
on 22. September 2024, 16:05 by Prince Myshkin
Amazing puzzle, thank you!
on 22. September 2024, 12:13 by Prof.Dori
This is impressive that it solves uniquely with just those rules. Another amazing puzzle.
on 22. September 2024, 03:10 by Geb
What a wonderful discovery!
on 21. September 2024, 23:22 by juggler
Very pretty that this works!
on 21. September 2024, 19:25 by Franjo
Funny little puzzle. And very easy. Interesting that this really exists. Thank you for sharing.
