4 Color Theorem

(Published on 30. June 2025, 03:15 by eap314)

4x4 sudoku rules apply to each grid.
Each color contains a digit that is the same throughout the grid. Colors are not necessarily distinct.

Play on Sudokupad

Not as beautiful as before, but a good introduction to meta-logic.

Solution code: Gray row 4 (4 digits)

Solved by zonny, atmospherium, mathpesto, taco.bella, rjhwm3, HazelTheColor, APigthatflys, Mattisahuman, buttons, Fizz, fuxia, jalebc, residentholy3, saxdaddyj, RickiFerrara, Decapod, NEWS, Avron, ... Zedarflight , Jodelbanane, pepe74287, asynchronous, Macarena, RobertBe, DylanRay, TheGreyBrewer, Nyxx, me and the paws, CaseyM, Kirra, Austin8521, Enkuryo, ratolibre, 5381, bereolosp, peznut, Senjo

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Comments

Last changed on 1. July 2025, 19:45

on 1. July 2025, 19:10 by dzamie
Sudokupad conflict checker is a little buggy on this one. Luckily that's not much of a big deal in 4x4s, since everything's right there and very easily visible. Fun little puzzle!
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eap314: It was built from a 9x9 grid, so it probably thinks it's a 9x9.

on 1. July 2025, 00:59 by SanFranSam
Speaking of the four colour problem... have you ever been to Kentucky? ;)

Last changed on 30. June 2025, 16:17

on 30. June 2025, 15:56 by Pairot
Colours are not necessarily distinct, but they don't necessarily overlap either!
Got a good chuckle out of me, great puzzle.
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eap314: If you know what the 4 color theorem is, it's even more funny. I'll leave this visible as a hint

on 30. June 2025, 10:45 by Fisherman
Very enjoyable.