Lagoona

From the publisher's website:

An exciting reaction and dexterity game
The shells are turned over using the little hammer. If pearls appear, the players must quickly look quickly to see which side the whale is "swimming" on. If the colours match, they may grab the whale. Whoever manages to grab it may place a pearl in their boat. The winner is the player who fills their boat first.

This game focuses on dexterity, concentration and responsiveness.