Combination of game and knowledge test on underwater sound.
The user is asked to help a dolphin get to her friends by answering questions. Each correct answer moves the dolphin one step forward. The game ends when the dolphin finally joins the group.
Quiz questions are randomly picked from a database of multiple-choice questions related to sound and underwater acoustics. Some of the questions involve typical underwater sounds that the user is asked to listen to and identify.
In each step the user can select between an "easy" or a more "difficult" question. The score points depend on the difficulty of the question and the speed of the response, while the score is lowered in case of wrong answers.