Unsurprisingly, Call of Duty: Modern Warfare 2 has once again claimed the No. 1 spot on Chart Track’s UK Software Sales Chart this week, beating last week’s contenders Assassin’s Creed II and New Super Mario Bros. Wii to the punch.

Modern Warfare 2’s sales are down 32% from the previous week, which it seems is more than enough to keep Assassin’s Creed II at No. 2 and New Super Mario Bros. Wii at No. 3, both of which are non-movers from last week.

Fifa 10 manages to step up to No. 4 from No. 6 last week, as Wii Sports Resort swaps places, moving down to No. 6 this week from No. 4. Wii Fit Plus in between is another non-mover at No. 5.

Mario & Sonic at the Olympic Winter Games also takes a quick walk upwards, from No. 8 to No. 7 this week, Left 4 Dead 2 exchanges positions by moving down to No. 8 from No. 7, Forza Motorsport 3 is yet another non-mover at No. 9, and F1 2009 moves into the coveted Top Ten by sliding into No. 10 from No. 11 last week.

Other interesting movement on the UK Software Sales Chart this week includes Dr Kawashima’s Brain Training moving up to No. 18 this week from No. 26, Dragon Age: Origins slipping to No. 20 from No. 17, DJ Hero vaulting into No. 21 from No. 35 last week, Rabbids Go Home careening into No. 23 from No. 40, Tekken 6 fighting its way to No. 26 this week from No. 33, and Halo 3: ODST tumbling to the last spot (No. 40) from No. 34 last week.

The Top Ten All Format UK Software Sales Chart follows below:

• Call of Duty: Modern Warfare 2 (Activision)
• Assassin’s Creed II (Ubisoft)
• New Super Mario Bros Wii. (Nintendo)
• FIFA 10 (EA)
• Wii Fit Plus (Nintendo)
• Wii Sports Resort (Nintendo)
• Mario & Sonic at the Olympic Winter Games (Nintendo)
• Left 4 Dead 2 (Valve)
• Forza Motorsport 3 (Microsoft)
• F1 2009 (Codemasters)