Comments on Puzzle #25820: Do you want to build a ...?
By Hanhong Xue (macroxue)
peek at solution solve puzzle
quality: 
difficulty: solutions: multiple solvability: some guessing?
peek at solution solve puzzle
quality: difficulty: solutions: multiple solvability: some guessing?
Puzzle Description:
This puzzle has a unique solution but is too hard for any human or an average computer solver. Whoever suggesting multiple solutions is wrong!
#1: Web Paint-By-Number Robot (webpbn) on Aug 6, 2018
Found to have multiple solutions by tsiebert.#2: Tom Siebert (tsiebert) on Aug 6, 2018
How can there be multiple solutions to this? Waste of time.#3: tsionyx (tsionyx) on Nov 21, 2019 [HINT] [SPOILER]
I made a solver, which find out this puzzle to be the hardest among all on this site. It found the first solution in ~12 hours and about 21 hours later it says this solution is unique. Check out my solver at https://github.com/tsionyx/nonogrid#4: derby (Derby) on Jun 18, 2022 [HINT] [SPOILER]
I give this puzzle top marks for design and difficulty. I thoroughly enjoyed it. If you are looking for a hint, watch for symmetrical number patterns which will solve all the snow flakes. Enjoy!
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