Bonuses
The secret bonuses to More Invaders are as follows: for a 500 point bonus, save the farthest left vertical column of invaders until last and shoot the second lowest invader last. If you are able to shoot the very lowest invader last, that will net a 1000 point bonus.
Hidden game
In order to play the secret hidden game, on the menu screen, hold down button 2 on the controller and press 4 to cycle through the games until 21 Matches pops up.
