Call of Duty: Black Ops Zombies is a fun, slick iPhone and iPad game in its own right, supporting both single player and multiplayer marathons sessions of first-person shooter survival against hordes of zombies. But the game's Dead Ops Arcade mode is almost more fun.

The weird thing is, you have to do a little work to unlock this top-down, twin-stick shooter mode ported from Call of Duty: Black Ops. Fortunately, it's fairly easy. Here's how you do it:

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To unlock the mode you just need to hunt around in the game's many menus until you find four golden coins.

One gold coin is located in the player profile, in the bottom left panel of the screen. Just tap it to collect the coin. Another gold coin is located on the co-op multiplayer screen in the bottom right panel. Again, tap the coin. The third coin is located in the top right panel of the Extras menu. The final coin is located in the top right panel of the More Apps menu option.

Once you've tapped all four coins you get a message saying that you've unlocked the Dead Ops Arcade mode. To play it, you just select the Dead Ops Arcade option from the map in single player mode.

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As I show in the video at the top of the page, this is a great little game, one I would have paid to purchase separately.