Cache is at posted coords. Everyone likes a Challenge and this series will try to bring this to you. It is a series of Century challenges based on the Difficulty/Terrain of caches but not both. You will need to have logged at least 100 to qualify - some of them are easier than others to obtain. To log a find you need to have logged at least 100 1 Star Terrain caches. The difficulty or type of cache does not matter. The cache is a short hike for some - up and down a few hills. After all it is a challenge cache so a little exercise is good. Provide a bookmark list or show proof any way you see fit. If your profile shows the matrix that is fine - we can then easily see if you have 100. You will need a sharpie for all of these caches.