Portal 2 Pre-orders Begin, Are Aperture Science's Recommended Valentine's Day Gift

If you disagree with buying chocolates, flowers or diamonds to give as Valentine's Day gifts, you'll be delighted to hear that Apeture Science has produced serious scientific research supporting your beliefs. Apparently, the perfect gift is pre-ordering a copy of Portal 2 ahead of its April 20 release. Coincidentally, pre-orders for Valve's first-person puzzler began today, with various bonuses offered by different retailers.

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Steam offers a free copy of the original Portal, GameStop has exclusive skins for co-op robot pals Atlas and P-body, while Amazon offers $5 in Amazon credit. The PC/Mac edition is currently $44.99 at all three retailers, while the Xbox 360 and PlayStation 3 editions are $54.99. The PS3 edition also includes a PC copy.