enter image description here As with my previous puzzle I made the 12 "rooms" larger but kept the same rules. I'm also adding the link to the rules for those that don't know the puzzles Click me!

And have fun!

Hint:

the black circles are only cosmetic, please ignore them.

Edit:

There was a minor mistake that made the puzzle a bit inelegant (the solution was not changed). Now it is fixed, I also removed the incorrect solution that was found; this is the last edit, I will eventually add the answer if no one can find it.

  • @ferret Thanks :D – SilverCookies Apr 25 at 20:19
  • This one is really frustrating me. Twice I think I've got it and then found one card that doesn't meet the rule... – IanF1 Jun 14 at 10:04
  • 1
    @IanF1 Take it easy, this one's a jerk – SilverCookies Jun 14 at 16:40
  • The key has got to be the difference between the bottom left of each set – IanF1 Jun 14 at 16:42

Perhaps,

dsq The count of intersections between red and black lines is even at left and odd at right.
We have 0;2;2;0;2;12 at left and 1;3;1;1;3;1 at right.
I'm really not sure about it because of the 5th left picture...

  • 1
    Nice thinking, but not the answer. Also, due to the ambiguity of the "balls" it's hard to connect them in a definite way. +1 anyway – SilverCookies Apr 26 at 12:36

I think the answer could be that

The line segment on the left only intersect with 1 line segment (either itself or another). Some of the line segment on the right intersect with more than 1 segment.

  • Not the answer. Also, not allowed under the rules: the pattern on the right cannot appear in the left boxes, not even once – SilverCookies Jun 11 at 12:44

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