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Batman: Arkham Asylum Game of the Year (GOTY) is on sale at GamersGate for $7.49 ($29.95) as their daily deal. Unfortunately, there’s only about 6.5 hours left to get in on the deal.
Over at GamersGate UK the game is on sale for £3.74 (£14.95).
I’m pretty sure this game uses GFWL.