Sid Meier's Pirates
Fire Chain-Ball and Round Ball
When you have a a ship with tons of cannons, during a battle, wait for all the guns cannons to be loaded and ready, then select chain-ball as the type of ammo to be used. Fire the chain-ball at your enemy and quickly click on Round Ball. The first wave of cannon balls that leaves your ship are chain-balls, the ones after that are Round-balls. Thus, forming a combo system.
