Portal 2 stays top of the UKIE/GFK Chart-track All Formats top 40 in a week that sees little in the way of change.  The first person puzzler – which the Train2Game blog reported Valve as saying is their best ever single player game – stays No.1 for the second week in a row.

The continued success of Portal 2 means Mortal Kombat once again sits in second place, one place ahead of former chart topper –as reported by the Train2Game blog – Zumba Fitness which raises one spot to No.3. Codemasters Operation Flashpoint: Red River moves up to take No.4 in its second week on sale, overtaking Call of Duty: Black Ops which drops two places to No.5.

Outside the top five, Lego Star Wars III: The Clone Wars moves down one to No.6, ahead of FIFA 11 which once again holds onto No.7, while Wii Fit Plus moves up one to No. 8. THQ FPS Homefront – which the Train2Game blog previously took an in depth look at – rises one position to No. 9, while Just Dance 2 completes the top ten.

Sega’s Virtua Tennis 4 is this week’s only new entry in 23^rd position.

The UKIE Gfk Chart-Track All Formats Top 10 for the week ending 30^h April 2011 is therefore as follows:

1. Portal 2 (EA)
2. Mortal Kombat (Warner)
3. Zumba Fitness (505 Games)
4. Operation Flashpoint: Red River (Codemasters)
5. Call of Duty: Black Ops (Activision)
6. LEGO Star Wars III: The Clone Wars (LucasArts)
7. FIFA 11 (EA)
8. Wii Fit Plus (Nintendo)
9. Homefront (THQ)
10. Just Dance 2 (Ubisoft)

The week ahead is a quiet one for new releases, with Plants vs. Zombies arrival on the Nintendo DS a handful of predominantly new titles  for portable consolesto hit the shelves.

So Train2Game, what are your thoughts on Portal 2 holding No.1? Is it a testament to a great game, or just a lack of competition? Will Valve tale their third top spot of the year next week? Or can Mortal Kombat take the title?

Leave your comments here on the Train2Game blog, or on the Train2Game forum.