This week we look back at a classic co-op game, Castle Panic. Monsters have decided to attach your castle in a clearing surrounded by dangerous woods.  Waves of monsters charge the castle.  Fortunately, the clever design makes it hard for the monsters to get at your castle and your highly trained warriors (knights, archers and fighters defend the castle), each specializing in combat on a certain type of terrain.  This is a pretty simple and accessible tower defense game that has had a relatively recent art upgrade and continues to be fun, if a bit simple.* Castle Panic (BGG, Fireside games)