I bought the ANNIVERSARY EDITION UP & DOWN ROLLER COASTER for my daughter's 2nd birthday and I'm glad I did! I was worried she would be too little, but she has mastered it. She can climb on the car, push off to get herself going, and push it back up to go again all by herself. The track is slightly textured so she is able to walk up it without slipping, even in socks. Some people said the steps were too narrow, but we haven't had a problem with it. I also have a 4 year old that loves it too. The only problem I've had is the kids don't want to share! Also, I love that I can  buy the Track Expansion Set  when they  grow a little bigger. It has been a great purchase, and I would definitely recommend buying it.