Create an explosive chain reaction in this physics puzzler that's simple to understand but difficult to master. Tap on a ball to make it explode, sending shrapnel into neighboring balls, and so on, and so on until the board is clear. You have to pick the right one though, so keep thinking about cause and effect to work out who's got to go first. We'll start you off on some simpler boards so you get the hang of it, then all hell breaks loose on boards with weird configurations! Balls might take one or more hits to explode, depending on their color - so watch out...