Puzzle Description Suppressed:Click below to view spoilers

#1: cathy mcweeney (catty) on Jan 12, 2023

i solved this after i made it and it didnt seem to need guessing ut let me know if it does

Fun solve! Some of the EL was tough to find, but easy once you spot it.

CL/LL got me to 63%
EL on 4 in C1: C1R5,C1R12-18 are white
LL
EL on bottom 2 in C2: in all cases C3R16-17 is black
LL
EL on left 2 in R13 (look at R11): R13C5 is white
LL to finish

thank you but i dont understand what all that means

I used quite a lot of zigzag logic, which can probably be described in more official terms. ^_^

@catty Here is a guide to the acronyms and shortcuts used in the hint post above:
CL - Color Logic
LL - Line Logic
EL - End Logic
C# - A C followed by a number means Column number. Columns are counted from left to right.
R# - An R followed by a number mean Row number. Rows are counted from top to bottom.
C#R# - This identifies a specific square based on the column number and row number. For instance C1R5 is the square in Column 1 and Row 5.
C#R#-# - This identifies a series of squares. For instance, C3R16-17 would be the two squares that are both in Column 3 from Row 16 to Row 17.

For more information on how to use the different types of logic, please check out tips shown under every puzzle. Tip 4 has information about color logic, and tip 7 refers to the advanced logic techniques such as end logic.

I hope this information is useful.

C1: A combination of edge/2-way logic (C5 eliminated with EL, then 2-way involving the 2s in C2) puts blacks in R8-9. LL.

C18: At least one of R7-8 will need to be white. This places a black in R8C20. LL.

C2: EL places white in R14C2 and blacks in R6C2, R12C2, and R16-17 C3. LL.

C3: If the black in R12 goes into R11, it creates a contradiction in R13. Therefore R13C3 is black instead.

LL to finish.

Found to be solvable with moderate lookahead by wombatilim.

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