There allow two players in the game with the happiness shared by two fellows more and doubled. There are two ways to control characters which are used by two players, one is KEY A and D to move left and right for player 1 and SPACEBAR to fire, while the other is LEFT and RIGHT ARROW KEY and KEY ENTER correspondingly. Bio Ball Boom is an action game, available on flash-games.net, for your spare time relaxing. The aliens drop the biohazard ball down to the Earth in order to invade the creatures in the planet, your organization found the plot and send you to cease the crisis. Use your light weapon to the ball and split it to vanish. Good luck.