To celebrate the milestone of free-to-play mobile game Deadman's Cross being downloaded more than one million times, Square Enix is giving away extra in-game currency through February 28 to all players who download and register the game.

Deadman's Cross, which launched earlier this month, is a first-person shooter with card-based RPG elements set in the year 2030. Zombies have arisen and are doing what zombies do: snacking on us tasty humans. Players must navigate the abandoned streets of New Livingston (puns!) with only a high-powered rifle and a deck of cards in search of the apocalypse's cause.

Killing zombies (or "deadmen," as they're called in the game) adds them to your deck of cards, though the game is also supported by micro-transactions if your earned cards just aren't getting the job done. Deadman's Cross is the spiritual successor to Guardian Cross, a similar free-to-play card game where players capture and battle wild beasts. [Image: Square Enix]