Definition for a video game sharing similar elements, aesthetics and/or concept with the cult action-adventure game Ico developed by Team Ico under Fumito Ueda direction and originally released for the PlayStation 2 in 2001. Ueda wanted to create a minimalist game around a "boy meets girl" concept and through Ico he introduced several design and technical elements, including a story told with minimal dialog, bloom lighting and key frame animation, that have influenced subsequent games. (via Wikipedia)

Shadow of the Colossus, Papo & Yo, The Legend of Zelda: Twilight Princess, Metal Gear Solid 3: Snake Eater, The Girl and the Robot, Prince of Persia: The Sands of Time and others are considered Ico-styled or influenced games.
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