Call of Duty: Modern Warfare 2 continues its crushing sales supremacy over every other game in Chart Track’s UK Software Sales Chart this past week, crunching Fifa 10 at No. 2 and Assassin’s Creed II at No. 3 this week to snatch No. 1 once again.

Modern Warfare 2’s sales are down a miniscule 7%, which is small enough to retain its market leading performance for the fourth week in a row. We’ll have to wait and see if it matches its older sibling, Call of Duty: World at War, which managed a straight five weeks at No. 1 before being overtaken by Fifa 09.

The same pattern could be followed as Fifa 10 (sales up 24%) is looking quite dangerous, and despite what must be a desponding defeat this week, the football sim manages to climb to No. 2 from No. 4 last week, pushing Assassin’s Creed II down to No. 3 this week from No. 2, causing a domino effect that catches New Super Mario Bros. Wii and sends it to No. 4 from No. 3 last week.

Wii Sports Resort (sales up 30%) and Wii Fit Plus (sales up 21%) continue their chart dominance tussle, effectively swapping places with one another as Wii Sports Resort lands at No. 5 from No. 6, and Wii Fit Plus sits at No. 6 from No. 5.

Mario & Sonic at the Olympic Winter Games (sales up by 28%) is a non-mover at No. 7 as LEGO Indiana Jones 2: The Adventure Continues (sales up 74%) shoots up to No. 8 from No. 12 last week. Forza Motorsport 3 (sales up 27%) stubbornly resists moving from No. 9, and Mario Kart Wii (sales up 24%) makes its way back into the coveted Top Ten, shifting into No. 10 from No. 11 last week.

Other interesting movement on the UK Software Sales Chart this week includes Left 4 Dead 2 dropping to No. 14 from No. 8 last week, F1 2009 losing a few places and charting at No. 16 from No. 10, Batman: Arkham Asylum (sales up 122%) re-entering the chart at No. 20 thanks to a retailer promotion, and Peppa Pig: The Game (sales up 384%) is launched back into the chart with the release of the Wii version.

Borderlands meanwhile reclaims positions and shifts to No. 23 from way down at No. 38 last week, Just Dance (sales up 290%) re-enters the chart at No. 30, and The Saboteur debuts in the chart at a lowly No. 39 in its first week on sale.

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

• Call of Duty: Modern Warfare 2 (Activision)
• FIFA 10 (EA)
• Assassin’s Creed II (Ubisoft)
• New Super Mario Bros Wii. (Nintendo)
• Wii Sports Resort (Nintendo)
• Wii Fit Plus (Nintendo)
• Mario & Sonic at the Olympic Winter Games (Nintendo)
• LEGO Indiana Jones 2: The Adventure Continues (LusasArts)
• Forza Motorsport 3 (Microsoft)
• Mario Kart Wii (Nintendo)

Source: Chart Track