Here you have to move around with the mouse to find the safe pace before the enemies are coming from you. They will try to destroy you so you have to run in the safe place to win the game. The enemies are coming right behind you and if you are caught you will lose and you have to start the whole game from the beginning. Don`t hurry to judge the game`s difficulty even though you may thing the first level is simple, because in higher levels you have more challenges that are waiting for you and it will be harder to accomplish your goal. There will be more and more enemies coming after you so you have to work harder to defend the tower from them. If they find the tower the game is over and you will not have the chance to try again. Steve trusts your skills so do your best to help him defend the tower. At the beginning you can see the story about Steve and his tower who is now attacked by the enemies. If you want you can skip the story if you do not want to watch it until the end.