I have a 9 month old that has been wanting to climb on everything. I added these to her play area. As she is a bit young to be on top of the "tunnel" I connected them like so: step + half round, angle + half round, tunnel by itself. This way she can climb up the ramp and stairs but not get so high to fall off the top of the tunnel. She does stand against and crawl through the tunnel. I would say these are a success.