It currently sits pretty atop the video game charts in the UK, outselling rivals Halo Wars and last weeks number one Street Fighter IV.
It marks an end to Sony's two year long drought from the chart top, the last being God Of War II all the way back in April 2007.
See the full charts after the jump.
1. Killzone 2 (Sony)
2. Halo Wars (Microsoft)
3. Street Fighter IV (Capcom)
4. Wii Fit (Nintendo)
5. Professor Layton and the Curious Village (Nintendo)
6. Sega Mega Drive Ultimate Collection (Sega)
7. FIFA 09 (EA)
8. Call of Duty: World at War (Activision Blizzard)
9. Ben 10: Alien Force (D3P)
10. Mario Kart Wii (Nintendo)