Design Your Own Track is a new feature in the next Bloons Tower Defense game. It is part of Creation Mode, and allows you to set up a track in any way you want. You can place track pieces, water, and anything else that can be used in a track. You can also set the background and location of the track (for example, it could be in Space). You can submit this track to the Sharing Center when you're done. You can to read the bloonopedia to get ideas.