Rather than being able to move freely around the world, in BTA you can fight in Arenas, series of Bubblefields filled with enemies. That's alright, but what makes it awesome is that you can create your own tanks and arenas! You can design your own avatar tanks, enemy tanks, and arenas as well as search to see what other players have created. If you're worried about quality, don't fret: Hero Interactive will constantly be making new Arenas for you to try out!