Game Info – The second task of the tournament where you have to swim through Merpeople.
Game controls – Use the arrow keys to swim with Harry Potter away from the dangerous Merpeople. Collect all the Gillyweed as it will replenish your air and allow you to swim for longer.
Arrow Keys Left/Right – Rotate your swim.
Arrow Up – Swim hard.
Alt titles
Harry Potter And The Goblet Of Fire Underwater Wizardry
Source
http://www.gamesbox.com/games/2034/Harry-Potter-I—Underwater-Wizardry

