However, you cannot tell what a super-flag is until it's picked up. Good super-flags may be dropped and will remain for up to 4 possessions. The server may provide a yellow antidote flag. Driving over it will release the bad flag. Scoring the required number of wins, surviving the required amount of time or being destroyed will automatically drop the flag.
Bad flags disappear after the first possession.
Let's the tank go through buildings. You cannot back up in or into a building, nor can you shoot while inside. Shots guide themselves when locked on. This allows the player some control over the missile's steering. Just point and shoot.