A vibrant coral reef is under threat and you tap to shoo away starfish, jellyfish, and pollution bubbles before they damage the coral. Rare clownfish dart past — tap them for bonus points without disturbing the coral nearby. The reef spawns more threats simultaneously each wave until the ocean is churning with hazards.

Jewels baked into desert sand must be swapped to create matches of three or more in sun-baked rows and columns. Sand storms occasionally bury a row of gems, locking them until you match adjacent pieces to dig them free. Rare oasis gems clear entire columns when matched and are the key to surviving later levels.

Bubbles float up from the ocean floor in a colourful stream and you fire matching bubbles from a cannon to pop clusters of three or more. Bank shots off the walls for tricky angles. Special bubbles — bombs, rainbow bursts, freeze — drop from popped clusters and turn the tide in desperate moments. Clear the screen before it overflows.