As you level up, you'll unlock several floating bonuses that can give your score a big boost!
The floating purple ball is a points ball - click on it to get a big score bonus based on your current multiplier!
The floating gold ball is a time ball - click on it to get a few extra seconds added to the clock!
The floating X is a multiplier ball - click on it to increase your score multiplier! This is the same effect as matching the blue or yellow flashing tiles.
The floating snowflake is a freeze ball - click on it to put the timer on ice and slow it down for a few seconds.