In October 2010, Sega de-listed "Sonic" games with average or below-average scores on the review aggregator website Metacritic, to increase the value of the brand and avoid confusing customers. That month, "Sonic the Hedgehog 4: Episode I" was released to general praise, with Goldstein summarizing it as "short but sweet and well worth downloading". "Sonic Colors", released shortly afterward, was hailed as a return to form for the series, as was 2011's "Sonic Generations". However, Evans-Thirlwell, while considering "Sonic Generations" the best 3D "Sonic" game, also called it "an admission of defeat" for depicting the 2D and 3D incarnations of Sonic "together only to remind us of their profound differences". "Sonic Lost World" was released in 2013 to more mixed reviews, with some critics considering it a fresh take on the "Sonic" formula and others a poorly designed mess, while the two "Sonic Boom" games received widespread negative reviews. The "Sonic Boom" games became the worst-selling games in "Sonic" history, selling only 490,000 copies combined by February 2015. That year, Iizuka admitted that Sonic Team had prioritized shipping games over quality and did not have enough involvement in third-party "Sonic" games such as "Sonic Boom". Sega CEO Haruki Satomi acknowledged that Sega in general had "partially betrayed" the trust of the longtime fans and hoped to focus on quality over quantity.