5
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Another puzzle in the spirit of this puzzle. No RGB tricks or distractions. Enjoy!

enter image description here

Final answer: (7, 6, 11)

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3
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The border is:

A morse code, blues mean bars and yellows mean dots.
The message will be "ONE SQUARE OF 6X6 TWO VERTICAL LINES".

Based on it:

We need to tile the $9$ tetrominoes into squares with two vertical lines.
The configuration will be this.

enter image description here

Now:

If we treat black cells as 1's and white cells as 0's, we can read the message in binary.
The message is this.

enter image description here

Maybe there's a slight error here, but you can read the final answer as:

MORSING BINARZ[Y] TETROMINOES

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  • $\begingroup$ So fast! You are of course completely correct. And yes, I made a mistake with the "Y", rendering it as "Z". Sorry about that. Very well done! $\endgroup$ – Jens Nov 8 at 4:23

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