Left Click on a red circle and draw a path to a blue number. All of the dots on the way will merge into and reduce the blue number. Your goal is to use all the red circles to get the blue number down to exactly zero!

You can drag your line through multiple red circles ending on the blue square. The first circle will push the others into the blue square until the blue square reaches zero. However, if there are more dots than the number in the blue circle, they will stop moving. You can't go through empty spaces when creating a line.