You fight colored candies against a central area where there's many of them: you have to join 3 of the same color to make them vanish. The more you connect, the more points you earn. When you reach a certain amount you pass to the next level, and as you progress you'll have less time and everything will go better. You can use the heart to remove a group of candies, no matter whether they are equal or not: if you hit the center with the heart, you'll clean the entire row!
Use the mouse to move the candy before shooting it; click to shoot.