This is a seemingly straightforward game that's really hard to master. The objective is to keep the marble going in the loop, but moving and connecting the circles to form a flipped S, and then move and connect them again before the marble falls off. It's a lot of fun to go from really struggling the first couple of attempts, to getting into the rhythm and trying to go faster and faster. Eventually, once you master it, it becomes a fun fidget toy.

The print comes on 2 plates, with no supports needed, and no extra parts necessary apart from a 10mm ball (same as the one used in Hextraction). I used this one: https://www.amazon.com/uxcell-Carbon-Bearing-Precision-100pcs/dp/B07SYY2SY4

(I can put an STL file for a 10mm marble if you'd like, but it's available in models like these: https://makerworld.com/en/models/56582#profileId-58236)

You should be able to scale the model up or down for other marble sizes.

(This is my first design, only a week after I got my printer, so feedback welcome!)