Help, the fortress is under attack by marauding evil Penguins! In this Penguin Massacre game, you have to help protect the fortress from the invaders by aiming and shooting them before they reach the wall and start tearing away at your fortress. But be sure to look up too, because they don't just invade from the ground, they come in on balloons across the sky, and some of these attackers are very difficult to kill. You have many weapons to choose from in your arsenal, and upgrades are available. Be wary and watchful and protect your fortress from these menaces!