The mini-game Black Beak's cave is a Froot Loops mini-game than began in September, 2009. This is one of a series of Froot Loops games on Poptropica (2008-2009).
The object of the game is to recover the Fruity Treasure (cereal-like gems) from the cave. The first part of the game is a series of climbing rock steps, with three large rocks that slide down to block Black Beak's pirates. If the pirates touch you, you get bashed a bit. At the top, you slide a rock to block the flow of water (or is it milk?) so that you can reach the treasure chest. Toucan Sam and his three nephews join you. With the treasure is the "color laser". In the second part of the game, you use the "laser" to stop the pirate crew from retaking the treasure. This is done by using the laser to make "loops" on the ground around the pirates, creating holes that they fall through. If you hold them off for 30 seconds, you have won.
The "laser" is actually a rainbow-colored trail following your mouse, and there is a superfluous "score" given for surrounding bunches of pirates. The score for 30 seconds (about a dozen pirates) will be between 50 and 100 points.
Your reward for completing the game is a monochromatic "colorizer" that can temporarily color other characters in Poptropica.
(see related question)