BZFlag is a game that can easily be played in multiplayer against friends in a LAN network or against random people on the Internet. The popularity of the game is still high and you can find a room in which to play with your tank. The game goes as a first person shooter but you will have to calculate every shot that you make.
The game allows you to customize your tank with visual elements before you engage in a battle and afterwards you can purchase weapons that are offered from a varied selection. Then you will have to capture the flag.