playable version. It was released on June 12, 2001. On June 16, 2001, Sierra canceled the Dreamcast port of Half-Life, citing "changing market conditions". A late build of the Dreamcast version eventually leaked online, featuring complete versions of Half-Life and Blue Shift. Blue Shift and the High Definition pack were initially absent from the launch of Valve's content delivery system Steam in September 2003, despite the presence of both Half-Life and Opposing Force on the system. The game was released on Steam on August 29, 2005 along with the High Definition Pack. Blue Shift was also published as part of Sierra's Half-Life: Generation compilation in 2002, | EuroG = 6/10 | GSpot = 7/10 | GSpy = 70% | IGN = 7/10 | NGen = | PCZone = 78% }} Blue Shift received a mixed reaction from critics, holding overall scores of 67.40% and 71/100 on the review aggregator sites GameRankings and Metacritic, respectively. The game has sold around 800,000 copies at retail, excluding digital sales on Steam. In a review for IGN, critic Tal Blevins noted that Blue Shifts gameplay "is pretty much what we've come to expect out of Half-Life" by blending action and puzzle solving, stating that the latter "were all logical and well done, although some of the jumping puzzles were frustrating". Though IGN praised the game for maintaining the "epic" feel of the original, Blevins was critical of the relatively short length of the game. GameSpot reviewer Greg Kasavin agreed with many of IGN's criticisms, stating that "it's not that the game is easy so much that it's extremely short" and that Blue Shift "doesn't amount to much on its own terms". In addition, Kasavin described the graphical enhancements brought about by the High Definition pack as "helpful", but noted that "they still don't make Half-Life look like a new game—nor are many of the changes themselves very noticeable". Other reviews echoed complaints about the similarity of Blue Shift to previous games. GameSpy reviewer Jamie Madigan stated that "what really pulls the game down is the 'more of the same' factor". Although writing that the game "feels like just a few more levels for the original game", he noted that this is what Blue Shift was designed to be, given its origins as an add-on for a Dreamcast version of Half-Life. Madigan described the single-player campaign as "decent" and commented that the new graphics made