Puzzle Description:

(This puzzle was recovered from the 2016 database crash. Puzzle creators, please edit this puzzle and put the real description here!)

#1: Web Paint-By-Number Robot (webpbn) on Mar 26, 2023

Found to have a unique solution by wombatilim.

Found to be solvable with moderate lookahead by wombatilim.

I had an internet hiccup right when I was trying to post my hint, but I'll do my best to recreate it.

Initial LL gets to 58%.

C17: If the first 3 goes into R23, it makes R20 invalid, so R23C17 is white. LL.

C21: If the 5 goes into R22, it makes C22 invalid, so R22C21 is white. LL.

C30: EL marks R2-3 black. LL.

C28: EL prevents the first 2 from being placed in R3-4. From there, R23C28 must be black.

R22: If C28 is white, C27 would also be white, and R18 would be made invalid. Therefore R22C28 must be black.

C30: Whether the 5 goes into R1 or R6, R6C29 is black.

LL to finish.

Line logic only. Resolved just to make sure. At the 58% mark I spotted one of the trickier to find LL moves. It was relatively straightforward LL after this move:

- the black in C26R11 can only be part of the first three clue numbers, and any of them results in a dot in C26R13

Wonderful challenge!

Found to be solvable by line logic alone by dbouldin.

Goto next topic

You must register and log in to be able to participate in this discussion.