Back in Mother Russia last summer, mobile phone operator MTS engaged users on a titillating mobile scavenger hunt on behalf of its 'Red Energy' branded phone plan.

The game kicked off in Moscow at the Paveletskaya subway stop, where a user could scan a QR code (a two-dimensional bar code) with his or her phone, then answer a riddle, which led to a QR code hidden elsewhere in the city.

The goal: To be the first to crack seven codes in exchange for a Red-Energy-related prize. Games and prizes changed weekly.

The result: Adventurous types filled the streets of Moscow promoting Red Energy for free all summer long!

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