I love this marble run set from Marble Genius! The pieces were a little hard to connect at first, but that's to be expected from any new set. There are a nice variety of red, green, yellow, blue and purple translucent pieces. This set comes with different base types, including two large bases that really help with stability, lots of small tubes, ladder pieces, and lots of pieces for marbles to move around and do cool things. The box has 200 pieces, which are 130 connecting pieces and 60 marbles. The marbles are definitely the best part. There are regular marbles, but also marbles that glow (a glow light is included) and LED marbles that light up on contact. There is also a mesh bag to store them all. SO many marbles! We've been having a lot of fun with this set. I'm even considering getting a second set to make bigger runs! Definitely recommend this one.