Puzzle Description Suppressed:Click below to view spoilers

#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.

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