This cache is a reverse wherigo located in Hopkinton. You must use the below cartridge or certain available online tools in order to obtain the coordinates for the cache. The information below is necessary in order to obtain the cache coordinates.
Reverse Wherigo cartridge link
The following six-digit numbers are needed for completion of this wherigo:
874311
435904
496407
PI warning at the final cache - it can be avoided but it is present!