Untie the knots - Art of ropes comes from kun feng. The object is to swap tiles in order to create loops among the colors.
Hexa Knot which I reviewed in 2018.
According to the Leaderboard, only 61 people are playing this game. I'm number 8 with 35 knots solved. Only 1 person has solved all 111 knots.
This game is well done.