Vector Siege TD - new fun addicting tower defense game with multiple levels and many skills you can upgrade along your way. There are 9 towers, but 5 of them will need to be unlocked by using XP to get the tech level upgrade.To build the last tower, the Ultimate Tower you will need the gems upgrade. There is a limit on how many ultimate towers you can build, because building them without limit would just be too ultimate.To build a tower, simply drag from the tower menu at the bottom and place it on a valid place on the map.To upgrade,click it and it will give you the upgrade and sell options.To De-select towers,use space bar.