This is a very classic game. I believe you played similar games when you were young. Underwater World is embarking on a new adventure. It is similar to the previous playing method. What you need to do is shoot the ball out. The balls of the same color can be eliminated. Note that you should not let the ball slip into the hole, so you will lose.

Tap to shoot. Match 3 or more same-coloured gems to eliminate them. Destroy all gems in the chain before it hits the end. Tap the cannon to swap between the current and the next gem. Use power-ups to clear the board faster.