Build up your population to raise taxes. Choose 30 different types of construction unit including several types of weapon, ranging from mud-ball towers and cannons through to advanced futuristic weapons such as lasers and missiles. Place defences including mines, explosive balloons and tesla coils. Call upon powerful Acts of God, such as Lightning, Tsunamis and Firestorms. Fend off ever more advanced enemies, starting from simple wooden boats, right up to alien invaders.