Update:

​ and the first SWPUC are now featured in an article on Engineering.com.

https://www.engineersrule.com/impossible-modeling-challenges-solved-cad-power-users/

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Hello SOLIDWORKS power-users!

Let's have a bit of fun this afternoon. I challenge you to find a solution to the old pin-free-to-move-in-a-slot mating problem.

Please watch this video for a full description of the problem:

SOLIDWORKS Mating Challenge:  Pin in a Groove - YouTube

Will provide the solution at the end of the day, unless... you do that first.