For me, my favorite Match 3 game on the App Store is Underwater Match-3 Game

It is completely free to play, but you can also buy some in-game items for real money.

Features:

– Breathtaking underwater world!
– Play up to 250 levels filled with challenging puzzles!
– Awesome Power-ups!
– Connect and match multiple objects to create explosions!
– Fight and destroy the pirates!
– Challenge your Facebook friends!

Play Underwater Match-3 Game Now <click here for link>