Just Cause 2 has entered Chart Track’s UK Software Chart this week at No. 1, ahead of double debutant Pokemon SoulSilver at No. 2 and Pokemon HeartGold at No. 4, resulting in one of the biggest shake-ups the chart has seen this year.

This No. 1 position for Just Cause 2 makes up for the original title’s inability to clinch the top spot when it debuted at No. 2 almost four years ago. Square Enix seems to be on a bit of a roll this year, now with its second No. 1 published game in the UK after Final Fantasy XIII achieved the same feat a few weeks ago.

In the confusion, Battlefield: Bad Company 2 steps down one place on the chart from No. 2 to No. 3 this week, as Just Dance makes a similar move from to No. 5 from No. 4.

Call of Duty: Modern Warfare 2 has the cheek to move up the chart to No. 6 from No. 10 (perhaps in anticipation of the new Stimulus Package DLC?), God of War III loses its crown in a big way, falling from No. 1 to No.7, and Final Fantasy XIII stumbles in sympathy, moving to No. 8 from No. 3 last week.

Wrapping up the coveted Top Ten, Wii Sports Resort shifts to No. 9 from No. 8, and Wii Fit Plus is uncomfortable at No. 10, moving from No. 6 last.

The other big release of last week, Red Steel 2 for the Wii, debuted at No. 34.

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

• 1.) Just Cause 2 (Eidos)
• 2.) Pokemon SoulSilver (Nintendo)
• 3.) Battlefield: Bad Company 2 (EA)
• 4.) Pokemon HeartGold (Nintendo)
• 5.) Just Dance (Ubisoft)
• 6.) Call of Duty: Modern Warfare 2 (Activision Blizzard)
• 7.) God of War III (SCE)
• 8.) Final Fantasy XIII (Square Enix)
• 9.) Wii Sports Resort (Nintendo)
• 10.) Wii Fit Plus (Nintendo)
• 11.) New Super Mario Bros. Wii (Nintendo)
• 12.) Fifa 10 (EA)
• 13.) Sonic & SEGA All-Stars Racing (SEGA)
• 14.) Metro 2033 (THQ)
• 15.) Heavy Rain (SCE)
• 16.) Aliens VS Predator (SEGA)
• 17.) Prison Break: The Conspiracy (Deep Silver)
• 18.) Ben 10: Alien Force – Vilgax Attacks (D3P)
• 19.) Mario Kart Wii (Nintendo)
• 20.) Assassin’s Creed II (Ubisoft)

Source: Chart Track