Shells   Shells have a constant speed regardless of map obstacles. Shells have an unlimited range of flight. A shell stops moving if it exceeds map boundaries or hits a tank or a wall. If a shell hits a tank or a wall, it explodes for a constant brief time. A shell has a constant explosion impact range that effects the shield level of tanks in the explosion radius accordingly. Each tank has a limited supply of shells and a variable shells fire rate. Bullets   Bullets have a constant speed regardless of map obstacles. A bullet has a limited flight range. A bullet stops moving if it exceeds its range, exceeds map boundaries, or hits a tank or a wall. Bullets do not explode and have no impact radius. When a bullet hits a tank, the tank's shield is reduced accordingly. Each tank has a limited supply of bullets and a constant bullets fire rate. Mines Mines do not move on the board. Mines are released by tanks (behind the tank’s body). A mine explodes when a tank crosses it. Mines have a limited (but long) lifetime. A mine disappears if it explodes or its lifetime expires. When a mine explodes it decreases the shield level of the passing tank with a constant value. Each tank has a limited supply of mines. Mines cannot be placed on tanks, walls or other mines. Aerial support (bomber)   A tank can summon aerial support only if it has that bonus. Each tank can posses up to a single aerial support bonus at any given time. When a tank issues aerial support, the player specifies the bomber’s position on the map border and its direction vector. Once the bomber is launched, it flies in a straight line with a constant velocity above the battlefield dropping bombs at constant intervals. The bomber ignores any obstacles or moving objects on the battlefield and disappears when it exceeds map boundaries. When a bomb hits the ground it explodes for a constant brief time. A bomb has a constant explosion impact range that effects the shield level of tanks in the explosion radius accordingly. Bombers can be summoned concurrently (by different players).