Defense Alien War is an online game at 43g.Com. You can play Defense Alien War in your browser for free.The game's mission is to defend the galaxy planets from the space invading aliens. You are this galaxy's last hope, so do your best and defend the paths that lead to your base and to other planets. There are waves of spaceships rushing towards your base so build many types of towers to defend the well known path. Good luck and have fun!