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#1: Al LaPointe (kancamagus) on Jul 26, 2023

Fun and excellent solve. Line logic, color logic, edge logic, smile logic - all these came into play. Long and difficult, but eminently solvable! Now I have the song stuck in my head...

C8: The color logic here is a bit tricky to spot, but the 10 needs to be placed below R31. (This is not advanced logic, just some color logic I missed initially so I thought I should mention it here.)

Initial line & color logic (including the above) gets to 78% with red and black remaining.

R14-15 C49-52: Smile logic finishes the black here.

R31: EL on the red marks C1-4 and C23-26 white. L&CL.
R30: EL on the red marks C3-4 and C23-24 white.

Line & color logic from here gets to 94% with only black remaining.

R41: If the remaining 2 is placed in C27-28, R40 is invalid. R41 C35-36 are black instead. LL.

R38: If the remaining 2 is placed in C27-28, R37 is invalid, so these squares are white.
R37: If the remaining 2 is placed in C27-28, R36 is invalid, so these squares are white.

LL to finish.

Found to be solvable with moderate lookahead by wombatilim.

Didn't track my solve, but completely agree with Al and Wombat!

Buen puzzle, soluble lógicamente ... casi todo.

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