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Hidden Wonders of the Depths

Scurry through the underwater squares with `Crab` to help the mermaid build her fantastic home. Hidden Wonders of the Depths is a liquid mix of Match 3, Mahjong, and Hidden Object gameplay. No oxygen tank required as you move around collecting ancient artifacts. Discover hidden wonders in the depths of this vast, lively sea.

http://www.bigfishgames.com/download...ths/index.html

I don't know if you can get the mac version free, but you might try freedepthsemailmac at: http://www.bigfishgames.com/download...ths/index.html