several packages of downloadable content that added features to single-player gameplay. These include a more difficult single-player mode and a continuous battle mode with all of the game's bosses back-to-back. One downloadable addition, "Team Attack Amigo" mode, sends players through a multitude of levels, changing to a different character every two or three levels and culminating in a boss fight. The PlayStation3 version was delayed to allow more time to incorporate the downloadable content, and thus launched alongside it. The game was digitally rereleased via the Xbox Live Marketplace on April 15, 2010. The following October, various Sonic games with average or below average scores on the review aggregator website Metacritic, including Sonic the Hedgehog, were delisted from retailers. Sega reasoned this was to avoid confusing customers and increase the value of the brand, following positive prerelease responses to Sonic the Hedgehog 4: Episode I and Sonic Colors (both 2010). Sonic the Hedgehog was relisted on the Xbox 360 Marketplace in May 2022. Reception Sonic the Hedgehog was well-received during prerelease showings. Reception to prior games Sonic Heroes and Shadow the Hedgehog had been mixed; after a number of well-received showings and demos, some felt Sonic the Hedgehog could be a return to the series' roots. GameSpot said the game "showed a considerable amount of promise" after playing a demo at E3 2006, and GameSpy praised its graphics and environments. In 2008 GamesRadar said that it had looked "amazing" before its release. At the time of release, the game received widespread negative reviews. Metacritic classified both versions' reception as "generally unfavorable". Sega reported that the game sold strongly, with 870,000 units sold in the United States and Europe within four months. The Xbox 360 version was branded under the Platinum Hits budget line. Critics were divided on the game's presentation. IGN called its graphics and audio "decent" and felt its interface and menu system worked well but lacked polish, but GameSpot said the graphics, while colorful, were bland and only a small improvement over sixth-generation games, a sentiment echoed by 1UP.com. Game Informer and Eurogamer noted several graphical glitches. Eurogamer also criticized the decision to continue the Sonic Adventure style of gameplay, believing that Sonic Team had learned nothing from the criticisms of past games. Reviewers singled out the game's camera system, loading times, controls, level designs, and glitches. GameSpot said the level design was worsened by the frustrating camera