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[Update, July 29: Thanks to everyone who entered. Here’s the answer and the winner.]

This week’s Name that Tech Tune contest is one of the most challenging we’ve ever run, and we’ve lined up a great prize for the person who ultimately wins: an HTC Sensation Android device, courtesy T-Mobile.

If you’ve never played before, here’s how it works: Listen to the sound below, and if you think you can identify it, send your answer to [email protected] by Thursday July 28 at midnight Pacific time.

From the pool of correct answers, we’ll randomly select one person to win the device. Ready for the challenge? Here’s the sound.

[Update: Some readers are saying that the audio player above isn’t working (although it is for me). Here’s a direct link to the MP3 for anyone having problems.]

We did give one hint during this week’s GeekWire radio show and podcast: It’s a handheld game device. Listen to the full segment below for our commentary and to hear the sound again.

Once again, send your entry to [email protected] if you think you know the answer.

A big thanks to T-Mobile USA for supplying the prize. Follow T-Mobile on Facebook and Twitter, and also look for T-Mobile (along with GeekWire and many others) at the gdgt live event in Seattle Aug. 5.

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