Protect your MCV and destroy the enemies. You are only able to build towers near your MCV. All your tanks will appear from left frontline. Click the unit icon on top to produce more units, keep in mind that producing units will take away from your funds. You can cancel any production process by clicking the units icon on the bottom to get your money back. Remember, the more units you create will make you incur more of a maintenance charge, too many units can even cause your funds to stop increasing. Switch to the tower category and choose a tower and place it near your MCV. During its building process, you can not create a new tower, but you may still cancel the tower icon on the bottom. Use a single click of mouse or draw a rectangle to select your units. Then click the ground to move. If you hold down the CTRL key, the units will stop to attack when they meet an enemy. You can also click the enemy to attack. You can press SHIFT to show all units life bars. The battle is intense and it will be fierce, you can click the menu button to pause the game and have a chance to quit the battle.