Tetrafolium
(Published on 4. June 2025, 21:56 by ul-Rhymm)
Standard sudoku: in each row, column, and 3x3 region, each digit 1-9 appears exactly once.
Killer: in cages, digits do not repeat and sum to the value in the top left corner.
Modular lines: each set of three consecutive digits along a line contains one digit from {1/4/7}, one from {2/5/8}, and one from {3/6/9}.
Solution code: Row 5
Solved by SKORP17, ymhsbmbesitwf, Tacocat, RickiFerrara, Bjd, lianarox, by81996672, BlackWolf, jalebc, cmigas, snowden, peterkp, tgstar, butch02, Statistica, MAWA, paranoid, Luaryo, scushuaishuai, jlaitio, ... galium_odoratum, abed hawila, Kabcar, marhas, puzzlepandit, nunc, FullDeck-Missing, lovely, RockyRoer, ghosting, Jesper, joelth, apothycus, Katchoo, Epsiloneuclid, Aerasharathestia, mcs131313
Comments
on 5. August 2025, 16:02 by FullDeck-Missing
This was stunningly good use of the interactions between modular lines and cages! Thank you for setting and sharing!
on 13. July 2025, 09:40 by puzzlepandit
Agreed with earlier comment that this has very smooth flow. Could be 2* difficult for solver if solver knows modular maths well.
on 5. June 2025, 01:53 by Tacocat
Very nice! Smooth solve as a coloring puzzle.
