Unlike for other puzzle caches, experienced puzzlers are invited to add their own suggestions and hints in logs. They will be added to the description to create a more comprehensive and collaborative teaching tool.
Field
Some puzzles are located at their listed coordinates, but something needs to be done to open the cache. There are two main types :
Field puzzles may require you to open a puzzle box, access the cache via a lock requiring a key or code, or use a special tool (including water). Sometimes a tool will be hidden on the cache or nearby it. At other times you will need to solve an additional puzzle using information gathered at the site. Most field puzzles will tell you what is required in the listing so that you can come prepared. There is a special attribute that indicates a field puzzle, so watch for it at the bottom of the listing.
Remember that merely finding the cache is not enough. If you do not sign the log, you cannot claim a find.
Challenge caches normally do not require a puzzle to be solved. In this case the cache is accessible in the normal way, but in order to log it must meet certain requirements. These will be outlined on the listing and may include caches found in several states, of a particular type, found on particular days, with certain attributes – the options are many and varied. You may sign the log if you find the cache but do not meet the requirements. However, you cannot log a find online until you do. Cache owners are able to delete your log if you do not meet the requirements.:
In this case you must find the cache and unlock it to access the log. There are two locks which use the same key. To make it more challenging, the key and the cache are up a tree… two different parts of the same tree. If you are tall, slightly built, particularly dexterous (and possibly foolhardy), you may be able to climb the tree, but this is not recommended, as the cache is along an old and fragile branch. Much more sensible (and kind to the tree) is a stepladder or free-standing ladder. Collapsible and/or ladders that have to be leaned against the tree are discouraged due to the previously-mentioned old and fragile limb.
Please return both the key and the cache to where you found them.
Note that despite numerous attempts by cachers to give this cache a much higher terrain rating, there is no need to cross the creek. Park in a side street and walk along Lyons road to the path that follows the O-Bahn track. It is possible that a flood will make GZ inaccessible and in that case the search should be abandoned. Otherwise, there is no need to get your feet wet.