Summer has officially arrived in Colorado, and so has the Decode Douglas County outdoors exploration game.

This activity was created to get residents and their families out of the house and into the fresh air, according to a news release from the county.

The first step is to pick up a decoder booklet or print it from home. Locations and a printable version are available at douglas.co.us/decode. This site also includes rules, instructions and a starting point for the adventure.

The booklet will lead participants to eight Douglas County Open Spaces and parks where they will discover a wooden post with a passport stamp on top containing a numeric clue, according to the release. To play, booklet holders are asked to use a crayon or pencil to create a rubbing of the clue and find the next location.

Once all eight stamp rubbings are collected, the code is cracked. The numbers can be used to open the locks on the Decode Douglas County Outdoors treasure chest -- inside is a prize, according to the release. Those who make it to this step will also be entered into the grand prize drawing.

“Douglas County hopes this fun, interactive program helps citizens of all ages discover new parks, trails and open spaces right in their own backyards,” County Commissioner Lora Thomas said in the release.