The hunt is on. Or it will be right after the main Google I/O keynote is over. If you're a registered attendee of the conference and you have some free time between sessions, the yearly location-based I/O treasure hunt will provide you with enough trivia and challenges to keep you entertained.

This year, you will be looking for Alex, the Android dog, who left a trail of NFC tags all over Moscone Center, starting with a booth on Floor 3.

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