You control a blue bird, and try to collect other blue birds to increase the length of your chain. Every blue bird you collect gives you points, but it also increases the length of you chain making it harder to avoid other obstacles like airplanes and red birds. If a bird in your chain contacts an obstacle you lose energy. Once all your energy is depleted the other birds in your chain fly away and the game is over. Energy can also be used to temporarily join all your birds together. Energy can be regained through one of the three power-ups as well as by gathering a new blue bird in your chain.