Darksiders customers get free Red Faction

Mysterious voucher can now be cashed in

US gamers that picked up THQ's Darksiders got a code that can now be traded in for a free copy of Red Faction: Guerrilla.

"Still hanging onto that mystery code?" says the Darksiders website. "Good, because this is what you're getting:

"A digital Hellbook disc featuring Darksiders art, videos, and other awesome stuff!

"A free copy of Red Faction: Guerrilla, a third person shooter featuring fully destructible environments... on Mars."

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The bad news for us is that the offer is only available to US residents (which ends on March 7, shipping not included).

We'll be asked THQ why we're not getting the same awesome deal.