Please make a map by specifying a size (no more than 32 would be a good start for your own sake), and click on the tiles. Blue tiles can be walked through from the sides, and jump through from below, but Hubert can't fall through them, and thus they work as a platform when he's on top. Black tiles are solids, and white blocks are air.

Also please not that upload to server probably doesn't work, because I don't have an SSL-certificate :(