Colorimetry (Four Color Pentomino Sums)
(Published on 19. August 2025, 09:00 by Agent)
Rules
- Latin Square: Place the digits 0 to 9 once each in every row and every column.
- Four Color Pentominous: Divide the grid into pentominoes. Each pentomino must be one of four colors: green, blue, red, or yellow. No two pentominoes of the same shape (including rotations and reflections) or the same color (or both) can share an edge.
- Four Color Sums: Clues outside the grid represent the sum of the digits placed in cells with the indicated color in the corresponding row or column.
- Pentomino Regions: Digits may not repeat in a pentomino.
Example Puzzle (5x5, 0-4)
Main Puzzle (10x10, 0-9)
Solution code: Digits in the blue cells in row 6 (from left to right), then digits in the green cells in row 10 (from left to right).
Comments
today, 19:03 by GoodMorningCallum
Absolutely wonderful. A really enjoyable puzzle, with some hard but beautiful logic throughout. Thank you!
yesterday, 15:16 by SimiC
1 hour and 59 minutes for this beast, and enjoied every second of it. The puzzle itself was amazing, and I want to compliment you for the tutorial puzzle as well. It only took 10 minutes and made me understand the mechanic perfectly, without taking away the difficulty of the big one
on 20. August 2025, 04:20 by Snookerfan
Fabulous puzzle, far outside of my comfort zone. I enjoyed it a lot, thank you!
on 19. August 2025, 21:19 by Jesper
Enjoyed it a lot, cool puzzle
on 19. August 2025, 15:23 by MaizeGator
Very unique logical ideas showcased in this puzzle. Classic Agent moments in the midsolve where I thought I'd broken things, only for a crazy option to be forced.
on 19. August 2025, 14:08 by dumediat
This is an excellent puzzle, with a very smooth solve path once one asks the right questions. Thank you!
on 19. August 2025, 13:24 by MattYDdraig
A magnificent puzzle. An incredible balance of difficulty and guiding. As someone without familiarity with the genre this did a great job of steering deductions even while clinging to its secrets.
