To unlock certain bonuses, you need to score the required number of points in each mini-game. For example, in the game: "Bubble Delirium from SpongeBob" you need to help Sponge blow soap bubbles to save the falling objects. And if you suddenly chose the game: "Fighting Plankton", then here you need to be very dexterous in order to manage to destroy the running army of Plankton.