GfK Chart-Track offers the top 20 bestselling full price PC entertainment titles in the U.K. for the week ending April 30, 2011. Things are fairly stable on the chart this week, with Portal 2 retaining the top spot for a second week and only one new entry, Darkspore entering the chart at #13 (though Fallout: New Vegas reenters at #20). The biggest positive mover is RIFT, which jumps six spots to number seven, and the largest drop is Call of Duty: Black Ops, which drops seven spots to #14, followed by Crysis 2, which drops five spots to #13. MCV has details on the all formats chart, where Portal 2 also holds the number one position for a second week. Oddly, Homefront stands at number nine on the all formats chart, but is completely absent from the PC chart.