Complete the LevelEdit
Simply block all the gaps over the water and let the fleas get to the finish.
Golden Fleas AchievementEdit
Block the gaps over the water and stop the fleas from getting to the finish with another block. Send the fleas backwards to bite away the block then block the fans so the fleas drop onto a surface over the water (Must add blocks). A flea will then fly up the balloon to the pad above, add a block infront of the portal so the flea does not go in, then it will push the lever destroying the golden blocks. If you wish to compelte the level after this, just make sure only 1 flea turns right and use the above method to save the other 19. That flea can then be saved by going through the teleporter.