Based on the film and book the game will deliver an experience that follows the same storyline and embellishes it with a series of exciting interactive levels based both on land and in the water. Alternating between control of Angus (the finder of the water horse egg) and Crusoe (the curious water horse that hatches from the egg) the player will be taken on an adventure of discovery and growth which sees the little water horse hatch, learn to swim and grow rapidly into a huge and unique beast that must escape to the open sea. All this action will be presented through two separate game play styles, one on land where the player must sneak around and avoid the suspicious adult foes and one in the water, guiding Crusoe (sometimes carrying Angus) from unsure swimmer to king of the waves.