Either upload a map you've made here, or click Show maps, and press one of the maps. Note that it doesn't always work on phone, and while making a map you can't upload it to the server.
Rules, in short: Hubert can either jump, walk left, or walk right at each timestep. He jumps by 2, and goes left/right by 1. If jumping while in the air, he will fall down 2/3 of the time, and go 1 tile further up 1/3 of the time. He can walk through white tiles, not walk through black tiles, and blue tiles can be walked through from the sides and from below, but he can't fall through them from the top