Alien Invasion 3D is a survival game that will truly test your shooting skills. Pick up all the ammos and weapons that are scattered around the map. Always make sure you'll have enough ammunition because it'll be ugly if you'll run out while fighting the aliens. There are some med kits that will help you along the way. There are two worlds that are connected with portals. Be careful on where you headed to because one of those worlds is filled with humongous boss aliens. You need to kill them so their minions will stop spawning and you can put an end to them once and for all!