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In page Shadow of the Colossus:

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Unlike Ico, Shadow of the Colossus received far more exposure, due in part to Sony putting its weight behind a massive advertising campaign.[5] It was advertised in game magazines, on television and on the internet, including a viral marketing campaign launched in October 2005. The site posted links to several websites claiming that the remains of five giants resembling certain colossi had been discovered in various parts of the world. The website has since been taken down. Some speculate that Ico's sales figures could have been improved if similar advertising efforts were made before its release.[6]