9 Kings
(Eingestellt am 19. Februar 2026, 20:30 Uhr von Killer Joe)
Hello.
Normal sudoku rules apply.
Each box has a King represented by the digit that matches its box number. The digits needed to complete an entropic set and a modular set are rooks.
Entropic sets are low (123), mid (456), high (789).
Modular sets are mod1 (147), mod2 (258), mod0 (369).
(In box 1 the digit 1 is the King and 2, 3, 4 and 7 are rooks because 2 and 3 complete the entropic set and 4 and 7 complete the modular set.)
There is only one King in each row, column and box position (aka disjoint set).
No King must be in check by a rook within the same box.
Have fun.
Lösungscode: Row 9, first 6 digits
Kommentare
am 22. Februar 2026, 18:53 Uhr von upinthesky
Really enjoyed this rule set!
am 21. Februar 2026, 16:58 Uhr von Gizmo
I thoroughly enjoyed that puzzle. A new combination of rules for me. Took a little for everything to click, but once you figured it out, the rest was a quick solve.
am 21. Februar 2026, 15:12 Uhr von Ol-Jay
Wow. Very cool, very fun!
am 21. Februar 2026, 00:00 Uhr von Jasperrr
Very fun, took me embarrassingly to figure out the disjoint set also counted for box position. After that, it went pretty smooth.
am 20. Februar 2026, 17:31 Uhr von superkinkel
Very nice idea. An excellent puzzle (albeit I somehow subconsciously read knight instead of rook and quickly ran into trouble ... but finally realized my misreading).
am 19. Februar 2026, 22:40 Uhr von HeyItsErin
Really great puzzle, I had a lot of fun unpacking the rule set and watching everything come together was brilliant.
am 19. Februar 2026, 22:32 Uhr von firespire
Had to look up what "check by a rook" meant as not a chess player. It's a move in chess in a horizontal and vertical motion any number of steps, so you need to ensure it doesn't see the "King" in cross "+" move in the same box.
You say have fun and this is textbook my idea of having fun. Rules new to me and an easy level to solve. You somehow even know I struggle with memory of a 9 digit solution code, I usually have to try and remember two sequences of 4 digits and work out the last missing number when I have got over here.
