Take to the battlefield with a large selection of powerful units which level up and upgrade based on the number of kills you get in stba.io. Futuristic hover tanks, bombers, and fighter jets. Start as a basic unit like the Javelin (artillery) or the Manta (air fighter). Increase your kill count to unlock more advanced units like the Harpy and Gladiator. Get even more kills to unlock the super units like the enormous flying battleship and the Ion Cannon!