Defend yourself against a Viking invasion in this puzzle/strategy game. Construct buildings and traps that will assist you in your fight against the Vikings before the battle begins. During the battle, click on groups of same-colored wizards to attack incoming enemies and fill up your magic, which is used to cast spells. Gain power by clicking on groups in quick succession; the larger the group, the more power you'll gain. You can click on an individual wizard, but doing so will cost you power. Don't forget to make repairs between waves!