This game is simple : The previous user mentions abot a Lego set's set number and it's name, and you describe the set. (EDIT: You need to mention another set after you finish describe the previous set)
An Example:
Member 1: 10236 Ewok Village
Member 2: You can get some Ewok minifigures from the set.
And the game continues be as imaginative and creative as you like.
I'll start here:
31026 Bike Shop & Cafe