Very nice and satisfying, but I would suggest ramping up the difficulty a little faster. I got until lvl 15 by just flipping the obvious areas, taking no more than 2 seconds. It's otherwise very cool and minimalist.

Edit: limiting it to square flips was a great idea. There are just enough moves to make the answer non-obvious (after lvl 15), but not so many possible moves that you get overwhelmed.

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Edit 2: I just remembered I made a similar "game"[1], where you select columns to XOR with other columns and try to reach the target pattern. Use the scroll wheel and shift+wheel to change the pattern and size.

That was actually part of a real research project in optimizing circuits for computing binary finite fields, where the "game" was a sandbox to try different algorithms. The best algorithm was actually found by someone playing in this sandbox and coming up with an efficient strategy.

[1] https://boppreh.com/source/playreduce/

Love it. The “par” value is a huge hint. You might consider hiding it

I agree the ramp up is a bit slow, but I love the concept, and the interface. I am stuck at level 26

edit: found a way to solve it in 6, but not in 4

Level 24. I took a natural approach (pull each corner to the center) and got a rather unfortunate picture

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Edit: and the right answer was so obvious, too

Played until 27. All the levels were pretty easy, 15-30 seconds per level. Mainly because of the "par" feature

Stopped at 74 but managed to par all before that somehow. Didn't really do any problem solving/deep thinking about it, just clicking what felt right

Neumorphic knot, a puzzle about Knot patterns: https://brainteaser.top/knot/index.html