Concordia (Sum dots, X-Sums, Kropki, German Whisper)
(Published on 7. February 2025, 21:49 by Bellsita)
After endless classes about isotope geology I came up with this. I'm sorry hahahaha
Rules:
- You were hired to date rocks from a certain terrain in Brazil. After getting the data from the geochemical analysis of U-Pb isotopes, you finally created a concordia diagram, with 207Pb/235U ratios on its X axis and 206Pb/238U ratios on its Y axis, in which the ages are plotted on the concordia line. In your diagram you found the ages of 3 rocks: the green rock, with 15 million years; the yellow rock, with 20 million years; and the pink rock, with 23 million years. However, the age of the blue rock still needs to be found.
- Normal sudoku rules apply. Each row, column, and region indicated by thick borders in the grid must contain the digits 1 to 9 once each.
- Colored dots: A number in a colored circle represents the sum of the four surrounding cells. Digits can repeat in a sum.
- Kropki: Cells separated by a black dot have a 1:2 ratio. Cells separated by a white dot must be consecutive. Not all dots are given.
- German whisper: Adjacent digits on a green line differ by 5 or more.
- X-sums: Numbers outside the grid indicate the sum of the first X digits, where X is the digit in the closest cell to the clue.
- All the ? represent the same number.
- The ages on a concordia line keep increasing and the diagram is not to scale.
Solution code: All the digits in c9 from top do bottom (9 digits in total).
Comments
on 14. February 2025, 18:03 by puzzlepandit
This was interesting. I was able to figure out proper solve path in seconds try. Good setting and approachable.
on 12. February 2025, 02:06 by greyhathero
Took me way to long to realize that the ? Clue also applied to the circle. After that hickup, smooth sailing. Took me the time of a 4 but if I read the rules right definitely 3. Loved it
on 9. February 2025, 09:49 by Piatato
Lovely themed puzzle, thanks!
on 8. February 2025, 23:56 by Playmaker6174
The adventure of Bells the Explorer seemed to return once again
on 8. February 2025, 12:59 by Myxo
Great!
on 8. February 2025, 12:30 by Snookerfan
Very nice puzzle and theme! Some weird interactions, that made it quite interesting and fun to solve. Thank you
on 8. February 2025, 07:15 by therealsillypenguin
This was one of those puzzles where every initial digit is very satisfying. Well set, and thanks for sharing!
on 8. February 2025, 02:42 by Niverio
Simply lovely
on 8. February 2025, 01:38 by Mr_tn
This puzzle rocks! :)
on 8. February 2025, 01:31 by damasosos92
I loved it. This puzzle taught me maths.
on 8. February 2025, 00:17 by mathpesto
A great theme (even if I didn't fully understand it lol) and a wide variety of logic packed in here. Very cool interactions between the different constriants.
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To be honest I still don't understand it either hahahahhaha
on 7. February 2025, 22:09 by dumediat
Thank you for the geology lesson!
on 7. February 2025, 22:07 by wisty
this was awesome i love it when puzzles
