As you play and make matches, there is a blue bar that grows under your profile. If you cannot find any matches, the bar is shrinking. Your goal is to fill the bar, because then you throw a snowball at your opponent and you freeze the game mode for a few seconds, taking the advantage!
If your opponent completes the blue bar, you will feel it…. First, a snowball will be thrown at your profile!
And then your game mode will have some frozen candies. The freezing will last for a few seconds during which you cannot play with the frozen candies.