In order to unlock the Special Item Functions in the New Age version, you must first accumulate a certain amount of points in the Classic Version.
Barrier - Employs a shield to protect your cannon (s) from attack. 20,000 Points
Laser - Lets you fire a penetration laser from your cannon(s). 15,000 Points
Rapid - Gives your cannon(s) rapid-fire capabilities. 5,000 Points
Speed Up - Increases the speed at which your cannon(s) fire. 2,000 Points
Stop - Temporarily freezes the invaders. 30,000 Points
Support - Support cannons appear and shoot together with your main cannon. 10,000 Points