TANK -- Battle City

Remember the Battle City on NES? I believe that is a lot of 80, 90, after childhood memories. Game, players operate a tank, the base of the icon is an eagle, it must eliminate to protect their base from destruction, to destroy all computer-controlled enemy tanks clearance. Game, each level there are 20 enemy tanks, if the player's base was shot, or the player all the tanks have all been destroyed, the game will cease. A total of 20 off the game, all of the battlefield area are 13 multiplied by 13, but each level terrain and obstacles have differences.