Click on a column to drop the next bubble there. Group same numbered bubbles together in groups of at least their number to pop them. Drag a bubble onto another to combine them if their sum is not higher than the MAX number. Special bubbles vastly increases the score of the group when popped. Increase your score to reach higher levels, increasing the MAX number. After every 5 bubbles, a line of bubbles will spawn at the bottom, pushing everything up. If the screen gets filled or a bubble gets over the top of the screen, it's game over. In timed mode, you have 5 seconds to drop or combine bubbles.