It all started with the IHG contest to give away free Intercontinental nights, which SPG quickly followed suite to give out nights on a Facebook contest.

And now that those contests are over, Hilton is coming up with a promo all this week to give away free night certificates in a treasure hunt contest it will conduct in 5 cities across the globe this week, so one for each working day. 100 certificates to be given away each day to celebrate the quarterly promo of Hilton where you get a free award night certificate. However, unlike the other contests which were centered around social media, Hilton’s treasure hunt will involve more physical activity.

To sign-up, you need to start following Hilton HHonors on Twitter at @HiltonHHonors, and await for them to tweet the clues for the treasure hunt. The first 100 people to finish an assigned task in the city of the day will receive these free certificates valid for a free night at any Hilton hotel around the globe.

The contest kicks off on October 17 (12 noon Eastern Time) in Washington DC, so watch out for the clues and head out if you are interested!