Valve's teleportation puzzler found its way out of the test chamber and onto the top of the U.K. charts in its debut week, making Portal 2 the first title from the Bellevue, Washington-based studio to claim the all-formats top spot.

GfK-ChartTrack announced its weekly top 40 video games this morning, noting that Portal 2 has already outdone The Orange Box, which only made it as high as the No. 3 slot on the U.K. charts when it was released in 2007. Warner Bros. Interactive's Mortal Kombat reboot also landed an uppercut, claiming the No. 2 spot ahead of perennial chart-topper, Call of Duty: Black Ops.


The all-formats top 10:
1. Portal 2 (EA)
2. Mortal Kombat (Warner Bros)
3. Call of Duty: Black Ops (Activision Blizzard)
4. Zumba Fitness (505 Games)
5. Lego Star Wars III: The Clone Wars (Lucasarts)
6. Operation Flashpoint: Red River (Codemasters)
7. FIFA 11 (EA)
8. Crysis 2 (EA)
9. Wii Fit Plus (Nintendo)
10. Homefront (THQ)
Of note on Portal 2 sales: more than half of the copies moved in the U.K. last week (Steam's likely robust totals not included) were for the Xbox 360, with 35% going to the PlayStation 3, and the remainder on PC.


Sharkey says: As you saw in our review, we're big fans of Portal 2. I'm a bit late to the dance and still working my way through the single-player campaign, but I'm having an absolute blast. The writing is fantastic and the new testing elements create some interesting puzzles. My only qualm so far is that the puzzles aren't all that challenging. I'm sure the difficulty gets upped in the later test chambers, but I've flown through the levels I've played, and without giving anything away, I'm now getting to know Cave Johnson. Here's to hoping the modding community digs into this one to create some real mind-benders.