search of hidden caches in different parts of the world. Search of hidden caches is totally new to me. I just read an article about this experience and it seems an attractive way to have a fun day outdoors. Geocaching is a high-tech treasure-hunting game. You have to find a hidden box, the treasure, using a mobile device, because you only have their geographical coordinates as information. First you have to search a geocaching website where you will find the geographical coordinates. There are varied caches, some are physical demanding, involving hiking or scuba, and other are easer, because, for exaple, are in a shop. When you have make up your mind which hidden cache you will search, you only need a GPS. You can use your smartphone and start to game. The GPS technology will help you to reach the place, but you need to use your wit to find the hidden cache. The cache is a box with things, normally no too expensive because the rewarding is the search itself and no material object. However, if you want one of the item that are in this box, you have to leave other of the equal or greater value. And finally you can tell your adventure in the website. To my mind, this search is a fascinate game, where you can explore different places, and train your mind.