The octopus is your little match-three helper! Its progress bar constantly charges as you match, and the more auto-matches your match generates, the faster the meter fills up. Once the octopus meter is filled, you can use the octopus power-up.  
 
Tap on the octopus and tap on any colored item not currently trapped by an obstacle such as the net. The octopus will then destroy all colored items of the same type on the match-three board. Octopus charges don’t stack or transfer between levels so be sure to use the octopus power-up as soon as possible! Using the octopus doesn’t use up a move! 
 
If you’ve tapped on the Octopus but don’t want to use it, tap again outside of the match-three area.