The Sumbin
(Published on 22. July 2025, 19:43 by sanabas)
This one is really sumbin.
You can attempt this puzzle at this sudokupad link
If you prefer a version with the bit values added to the puzzle as an aid to doing the arithmetic, use this sudokupad link
Good Luck!
Questions, comments, feedback are always welcome, either here or on the CTC community discord.
The rules:
Normal sudoku rules apply. Place the digits 1-9 exactly once in every row, column, and 3x3 box.
Kropki: Digits separated by a white dot are consecutive. Digits separated by a black dot have a 1:2 ratio, meaning one is exactly double the other. Not all dots are necessarily given.
Killer Cages: Some cells are surrounded by dotted lines, called "cages." Digits cannot repeat in a cage. The digits in a cage sum to the value in the top left.
Slow Thermometers: There are filled circles in the grid with connected thick lines called thermometers. The circle represents the bulb of the thermometer. Digits must not decrease along the thermometer starting from the bulb end.
In addition, the slow thermos represent binary numbers, where an odd digit represents a 1, an even digit represents a 0. Read as a binary number from bulb to tip, MSB at the bulb, LSB at the tip, that number is equal to the decimal sum of the digits on the thermo.
e.g. 1235 would be a valid thermo, because converted to binary it is 1011, (8+2+1), which is equal to the decimal sum of 1+2+3+5 (11).
My three most recent puzzles:
Snakes and Sandwiches
Count the Skyscrapers
Dotty Skyscrapers
If you enjoy this one, please try them too.
If you prefer a version with the bit values added to the puzzle as an aid to doing the arithmetic, use this sudokupad link
Good Luck!
Questions, comments, feedback are always welcome, either here or on the CTC community discord.
The rules:
Normal sudoku rules apply. Place the digits 1-9 exactly once in every row, column, and 3x3 box.
Kropki: Digits separated by a white dot are consecutive. Digits separated by a black dot have a 1:2 ratio, meaning one is exactly double the other. Not all dots are necessarily given.
Killer Cages: Some cells are surrounded by dotted lines, called "cages." Digits cannot repeat in a cage. The digits in a cage sum to the value in the top left.
Slow Thermometers: There are filled circles in the grid with connected thick lines called thermometers. The circle represents the bulb of the thermometer. Digits must not decrease along the thermometer starting from the bulb end.
In addition, the slow thermos represent binary numbers, where an odd digit represents a 1, an even digit represents a 0. Read as a binary number from bulb to tip, MSB at the bulb, LSB at the tip, that number is equal to the decimal sum of the digits on the thermo.
e.g. 1235 would be a valid thermo, because converted to binary it is 1011, (8+2+1), which is equal to the decimal sum of 1+2+3+5 (11).
My three most recent puzzles:
Snakes and Sandwiches
Count the Skyscrapers
Dotty Skyscrapers
If you enjoy this one, please try them too.
Solution code: Column 7, top to bottom
Last changed on on 22. July 2025, 19:45
Solved by SKORP17, henter, efnenu, careBear, L00ping007, bansalsaab, Joyofrandomness, Elliott810, wensty, by81996672, blueberrypug, TripleABattery, keaizhu, Briks, Isael, DylanRay, Maximus, AAAAAAAAAAAAAAAAAAA, gnidan, Romeo, Malakree, bodemeister, Qodec, Dentones, zonka
Comments
on 24. July 2025, 18:01 by bodemeister
Cool idea and interactions with the "binary thermos." Excellent that the thermos are all different lengths!
on 24. July 2025, 16:37 by Romeo
很有趣的设计，第一次尝试这样的数独，感激。
Last changed on 23. July 2025, 11:27
on 23. July 2025, 04:27 by Elliott810
Absolutely brilliant puzzle (and idea)! Thank you:)
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Thanks, glad you enjoyed it
Last changed on 22. July 2025, 22:55
on 22. July 2025, 20:57 by henter
Good fun! Threw me right back to the first puzzle I ever set.
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ooh, that looks interesting. Will have to try it.
