Ico

Ico is a boy with horns. At the age of twelve, when his horns grew large enough, the elders send him away to be sacrificed in order to prevent evil spirits from attacking the village. Entombed in a crumbling ancient castle, Ico only manages to begin his escape when a freak earthquake shakes loose the vessel he has been locked in. Ico shortly meets a princess named Yorda, who has been imprisoned by the evil queen. The two children must explore the ominous castle, trying to find a way to escape, persecuted by the queen's shadow minions.

Yorda will accompany Ico throughout most of the game. Many of the puzzles revolve around creating a way for Yorda to access special glowing blue doors, which only she is capable of unlocking with her powers. Being less athletic than Ico, Yorda will often need a more comfortable path built for her. Ico can hold Yorda's hand to lead her with him, and also call her to come nearer.

The game has no HUD (heads-up display). Other distinguishing features are the soft lightning visual style, low-key use of in-game music, and conversations through a fictional language, leaving much to the player's imagination.