Gymkhana online as a media to promote your product

[Raul]

Hi to everyone,

Recently I started working as a responsible of a marketing online department in a tech company. I am involved defining an international strategy for launching a new tech solution and we decided to use a online gymkhana, kind of scavenger hunt or treasure hunt, as a media for promoting and for engaging the users. Did anyone do something like that before? Do anyone know the cost of that, especifications, etc....?

Example:
http://www.dayinthecloud.com/challenge/
http://www.penguinbooksindia.com/delhi/the-delhi-treasurehunt.html

Please, I am totally lost. Is there anyone who could give me an orientation?

Thanks a million.

Raul.