It's that time of the month again when Pocket Gamer gives away a selection of codes for last month's absolute best games to our wonderful community, the App Army.

For those unaware, that's our diehard band of mobile gaming enthusiasts. In exchange for their critical thoughts, we give them codes for new games on a weekly basis and you can join in the fun by simply signing up on Facebook.

That's a requirement to get a chance at a code in the giveaway, but more on that later. Let's get to it.

Istanbul: Digital Edition

Dominate the bazaar in Istanbul: Digital Edition. Playing as a merchant you need to move yourself, and four assistants, through 16 locations, and collect as many rubies as possible. That sounds like a simple task, but don't be fooled. You'll need to use your head and plan well in advance if you want to come out swinging.

We thought it was a smart game, awarding it a Silver Award in its review and saying, "It won't be to everyone's tastes, but fans of the genre will love everything that Constantinople has to offer."

Okay, I'll give it a go

Not so fast! First you have to sign up to the App Army here, then fill in the super quick Google Form below.

If you can't see the form, click here.

And that's it. We'll be back tomorrow with a brand new game so keep checking back at 5PM BST.

What's the App Army?

The App Army is Pocket Gamer's very own community of mobile game experts. Each week, we provide them with a bunch of free codes so they can provide their thoughts in features like this. To join, simply follow this link to the page on Facebook.