After spectacularly stomping into the top 10 last week, the latest Riddick instalment, Assault on Dark Athena, has already nosedived all the way down to number 19. Bizarrely, though, the opposite appears to have happened with Red Alert 3, which has admirably scrambled back up to number 7 from number 15. Meanwhile, it's still business as usual at the top, with Football Manager 2009 and Empire: Total War taking the top two positions respectively. You can see the retail top 20 for the week ending 2 May below:

01 Football Manager 2009 (No change)
02 Empire: Total War (No change)
03 Warhammer 40,000: Dawn of War II (Last week: 4)
04 World of Warcraft: Wrath of Lich King (Last week: 3)
05 The Sims 2: Double Deluxe (Last week: 6)
06 Company of Heroes: Tales of Valor (Last week: 5)
07 Command and Conquer: Red Alert 3 (Last week: 15)
08 Fallout 3 (Last week: 7)
09 World of Warcraft: Battle Chest (Last week: 10)
10 Spore (Last week: 9)

Diving further into the chart reveals a re-entry from Dead Space at number 17, while Star Wars: The Best of PC has turned up at number 18. Interestingly, ELSPA lists this Star Wars collection as a new entry that's only been in the chart for one week, but as far as we can see it's the same collection that was released at the end of 2006. Meanwhile, F.E.A.R. 2 is continuing to climb back up the ranks to number 12, and Call of Duty 4: Modern Warfare has now exited the chart altogether. You can see the full retail top 20 for the week ending 2 May below:

11 Grand Theft Auto IV (Last week: 13)
12 F.E.A.R. 2 Project Origin (Last week: 16)
13 EVE Online (Last week: 20)
14 Far Cry 2 (No change)
15 The Sims 2: Apartment Life (Last week: 12)
16 Call of Duty: World at War (Last week: 19)
17 Dead Space (Re-entry)
18 Star Wars: The Best of PC (New entry)
19 The Chronicles of Riddick: Assault on Dark Athena (Last week: 8)
20 Left 4 Dead (Last week: 18)

Again, the Steam chart is much more interesting this week, with three new entries. Velvet Assassin has entered the chart at number 7, while Plants vs. Zombies has taken the number 3 spot. The big news, however, is that the pre-order of Killing Floor (pictured) has already entered the chart at number 2. Starting out as a mod for Unreal Tournament 2004, Killing Floor has now been packaged into a game in its own right, and it's proving to be very popular on Steam. You can currently pre-order the game from Steam for £11.24, which will save you a few quid from the standard £14.99 asking price. You can see the full Steam top 10 below:

01 Left 4 Dead (Last week: 2)
02 Killing Floor (New-entry - pre-order)
03 Plants vs. Zombies (New entry)
04 Counter-Strike: Source (Last week: 3)
05 Empire: Total War (Last week: 7)
06 The Orange Box (Last week: 1)
07 Velvet Assassin (New entry)
08 Warhammer 40K: Dawn of War II (No change)
09 Team Fortress 2 (Re-entry)
10 Call of Duty 4: Modern Warfare (No change)

Have you bought any of these games? Let us know which ones you're currently playing in the forums.

Leisure software charts compiled by Chart Track, © 2009 ELSPA Ltd