<a href="http://duxter.com/world-of-tanks/">world of tanks tech tree</a> is the first and only team-based massively multiplayer online action game dedicated to armored warfare. Throw yourself into the epic tank battles of World War II with other steel cowboys all over the world. Your arsenal includes more than 300 armored vehicles from America, Germany, Britain, France, Japan and the Soviet Union, carefully detailed with historical accuracy. The game includes 2 parts: fast & furious 15 vs 15 PvP armored battles & a persistent world map where hundreds of clans wage never ending global war. Each tank has dozens of upgrades & modules. Crew members improve their specialization & get new skills, players gets awards & unlock special abilities. The game also features dozens of other "social" activities such as trade, tournaments, special events, & historic campaigns.

world of tanks is the most amazing action game that can offer you an hours of entertainment.
Just for the fun of it, it is recommended to shoot your team mates in the rear. This allows you to test your gun to see if its effective at causing damage. Every once in a while, go berserk and start rampaging and shooting at all your team mates.