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The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
It's a digital key that allows you to download Portal 2 directly to PC from the official Platforms.
Games2See compares the cheapest prices of Portal 2 on the digital downloads market to find the best sales and discount codes on trusted stores.
STEAM is a special marketplace for video games distributed as digital activation codes (cd key) and can be considered as one of Steam alternatives for buying games.
To find out more about STEAM and how to buy Portal 2 visit:
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