According to hardwarezone.com after hitting the top spot on its release, Halo2 has dropped 3 places to number 4. The hugely popular Grand Theft Auto: San Andreas has stepped in to take that top spot, followed by Need for Speed: Underground2 and Half-Life2. They also say even though Half-Life2 is third, it has still become the third fastest selling PC game ever in the UK, behind Championship Manager 4 and The Sims 2.

Source: Hardwarezone.com, Gametracker Offical UK Chart