As one of the more popular games on mobile of recent years, Puzzle Bobble was inevitably going to spawn a lot of spin-offs and clones. Amongst these, you'll find Bublex Mania from In-Logic, which sets the action in an underwater world, with an Octopus acting as your launcher.
Bublex Mania follows the same general format of firing multi-coloured bubbles up to the stack at the top of the screen, with the aim of creating groups of three or more of the same colour, causing them to pop and be removed from the stack. If the stack gets too far down to the bottom of the screen, it'll cave in and your game will be over. Using the d-pad, you can aim the cursor to where you wish to fire the next button, and then press the action button to launch it.