that this can cause the frame rate to lag. The easy gameplay for the PC version was criticised by GameSpot, adding that the auto jump function removes any form of a challenge from the block puzzle and platform sequences. GameSpot described the score by Jeremy Soule as "enjoyable", but its repetitiveness and shortness made for less variety throughout the game. GameSpot praised Game Boy Advance version for its well-animated graphics and environment, paying close attention to small details such as Harry's cape flapping while he moves and his spellcasting gestures. Game Vortex criticised the GBA version for its lagging graphics that occurs when casting the "Flipendo" spell, the repetitive environments for each spell challenge level. It also criticised not being able to jump over bottomless pits in the spell challenge levels, where falling down results in the level being played from the beginning. GameZone praised the overall gameplay, controls and graphics, for the GBA, commenting that it is "a solid, enjoyable product", but pointed out draw-backs such as the simplistic puzzles. Game Vortex and GameZone both praised the Game Boy Color version's well detailed environments, gameplay and colour usage, but was faulted for its lack of detail on enemy characters who appeared indiscernible to the main characters. IGN commented that those who had not read the books "may be left in the dark", as there is very little narrative in the game, and tends to be aimed at Harry Potter fans. Sales Philosopher's Stone received positive sale figures, despite mixed reviews. From November 2001, to February 2002 it was listed as one of the top three highest-selling PC video games, and was the top selling PC title in December 2001. In February 2002, the NPD Group listed it as the third top-selling PC game of 2001 after being available for only two months in North America. North American sales of its computer version reached 867,481 units by the end of 2001, which drew revenues of $24.6 million. The PlayStation version sold eight million copies, making it one of the best-selling PlayStation games and one of the best-selling video games of all time at the time of the release. The PlayStation version of The Philosopher's Stone received a "Platinum" sales award from the Entertainment and Leisure Software Publishers Association (ELSPA), indicating sales of at least 300,000 copies in the United Kingdom. ELSPA gave the game's computer version a "Gold" certification, for