Portal 2
gameappid 620 · released Apr 18, 2011
The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
Price
$9.99
Lowest ever
$9.99
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Reviews
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Price history · DE
A step series: the price held until it changed. Shaded spans were discounted. Points marked as carried forward are inferred from the last observation before the window, not measured inside it.
No price has been recorded for this app in DE yet.