City Invasion is an interesting action game for free. The city?s defenses have been crippled by a massive earthquake. The enemy has taken this opportunity to launch an attack. It?s up to you to rally your men and push back this vile assault. Build units to attack the enemy headquarters and defend your own. Press Up/Down to switch between the five attack lanes, then click on the unit icons to build a unit in that lane. Click on the special ability icons when they are fully charged to use an ability. Have fun and good luck..!