As of last week, Rockstar’s Red Dead Redemption has managed to hold onto the No. 1 position on Chart Track’s UK Software Sales Chart for four weeks in a week (the first title to do so in 2010), despite a massive 34% drop in sales, simultaneously holding off an attack on the position by Nintendo’s Super Mario Galaxy 2 during that game’s first week on sale.

Chart Track tells us that there was a difference of only a thousand units in sales between Red Dead Redemption and Super Mario Galaxy 2 – close indeed. In the end, Super Mario Galaxy had to be happy with its No. 2 position.

2010 FIFA World Cup South Africa (sales down 11%) slips down to No. 3 from No. 2 this past week, but with the start of the real life world cup, this position is sure to improve, or at the very least remain stable.

Nintendo’s puzzle game, Rooms: The Main Building (sales up 76%), shoots up the chart after debuting last week, now sitting at No. 4 from No. 12 last week, while chart dominator Just Dance (sales down 27%) shifts down to No. 5 from No. 4, and Wii Fit Plus (sales down 33%) slips down one place to No. 6.

Call of Duty: Modern Warfare 2 (sales down 27%) is a non-mover at No. 7 (for the third week in a row), The Sims 3: Ambitions (sales down 40%) moves to No. 8 from No. 6, UFC 2010 Undisputed (sales down 60%) falls from No. 3 to No. 9, and Wii Sports Resort (sales down 37%) takes a walk to No. 10, down from No. 8 last week.

Meanwhile, debut title Green Day: Rock Band hits the chart at No. 14.

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

• 1.) Red Dead Redemption (Rockstar)
• 2.) Super Mario Galaxy 2 (Nintendo)
• 3.) 2010 Fifa World Cup South Africa (EA)
• 4.) Rooms: The Main Building (Nintendo)
• 5.) Just Dance (Ubisoft)
• 6.) Wii Fit Plus (Nintendo)
• 7.) Call of Duty: Modern Warfare 2 (Activision Blizzard)
• 8.) The Sims 3: Ambitions (EA)
• 9.) UFC Undisputed 2010 (THQ)
• 10.) Wii Sports Resort (Nintendo)
• 11.) Blur (Activision Blizzard)
• 12.) Prince of Persia: The Forgotten Sands (Ubisoft)
• 13.) Lost Planet 2 (Capcom)
• 14.) Green Day: Rock Band (EA)
• 15.) ModNation Racers (SCE)
• 16.) Uncharted 2: Among Thieves (SCE)
• 17.) Just Cause 2 (Eidos)
• 18.) Super Street Fighter IV (Capcom)
• 19.) Split/Second (Disney Interactive Studios)
• 20.) Battlefield: Bad Company 2 (EA)

Source: Chart Track