Green UFO Bloons steal loose blops that have not been collected, up to 100 blops per time before it disappears. Green UFO Bloons must first be hit around five times. It will grow a shield and drop all blops it was collecting, although it will keep blops already collected. It will disappear to the side and reappear shortly later. This process must occur once more, with the green UFO turning white when appearing for the third and final time. If it is not popped quickly enough, it will disappear at the top of the level. Likewise, popping it before it disappears with its lose blops will cause it to explode, scattering all the blops it tried to steal for the player to collect. Mousing over a Green UFO will let you collect its blops.