flOw. You can download it right now from the PSN for free, without having to deal with any cumbersome coupon codes. Our generosity only extends so far, however -- the free download will stop being offered at midnight EST tonight. Hurry up and grab it -- and don't say we never gave you nothin'!
(Fine, we're not the party responsible for the game's free-ness. We suppose you can say we never gave you nothin' to your heart's content.)
[Thanks to everyone who sent this in!]