You need to have a GPS or a smartphone to play the Wherigo
This is a reverse geocache, you can see the distance, but not the direction.
You also need 3 codes. At the startpoint near the traffic lights, you will find a small sign "KS??????". Use the digits to get the codes for this cartridge.
??????-17193 = code A
??????-75956 = code B
??????-306356 = code C
Follow the Wherigoinstructions and enter the codes. Your mission is to get within 25 meters from the geocache. When you are, the cartridge will tell you the exact final coordinates of it. Note that you only have 50 tries, try to use as few as possible. If you should fail, you can just start again.
If/when you find the geocache, sign the log as usual. You will also be given a personal password so that you can create other geocaches like this one after solving one if its kind. Good luck and happy hunting!
Download the Wherigo here