Make Google Earth your friend
The best advice that I can give on how to find a Puzzle or Mystery geocache is to make Google Earth (GE) your friend.
Download it here.
Once you have worked out possible solutions, or partial solutions to puzzles, plug the co-ordinates into GE. The location will give you a good indication of whether you are correct or not. For example if the co-ordinates are in someone's backyard, or in the middle of the water or somewhere else unlikely, then you're probably not correct. Eliminating possibilities in this way will save a lot of driving. I have solved many mystery caches in this way even when I couldn't work out the total solution. You can often work out enough of the puzzle to get you there.
Often you only have to work out a few of the last digits to be able to solve it.
This doesn't always work, but it sure helps in a lot of cases.
Mystery Geocache Tutorial Video
Here is one of the best tutorial videos on solving Puzzle or Mystery geocaches that I have seen. It's by Zytheran based in Adelaide, Australia who is famous (infamous?) for his puzzle caches. He gives you a lot of tips of narrowing down your focus.
Do you have any tips that you can share on how to find these types of geocaches.
Even though geocaching has been around for over 10 years, it's surprising to find that many people have never heard of it, or if they have, how to geocache.
So what is it?
Some people describe geocaching as a high-tech treasure hunting game.
Geocachers hide a container called a geocache (or cache for short) somewhere and record the co-ordinates of its location using a GPS receiver. These co-ordinates plus a description of the location and possibly a hint about how to find it are entered into a huge online database at www.geocaching.com.
Other geocachers can then search for caches near a particular location – wherever they may be in the world. Every country in the world has at least one cache. Even Antarctica has caches.
If you want to participate you need to register at www.geocaching.com. A Basic Membership is free and allows you to view the co-ordinates of the geocaches. A Premium Membership is very economical at US$30 per year and provides a wide range of useful features compared to Basic Membership.
You will need to buy or borrow a GPS receiver in order to find geocaches. However there are individuals who manage to find geocaches by referring to a map!
Many geocachers have become concerned about the increasingly poor quality of geocaches that are being placed.
This Progeocaching site is aims to show people how to geocache properly and help to put the quality back into the game.