The first Jasmer Challenge come out in Northern California on December 19, 2008. Since then, it has spawned a plethora of others.
The Minnesota Twist: You must find at least one cache per year in the state of Minnesota. 2000-present. Yes, some years will be more difficult, but it is completely doable. If at the time of you logging this cache there are no active MN caches from a particular year, you do not need one to claim a find.
Please provide proof of your accomplishment any way that you see fit. Your profile should have the month placed grid, so that will suffice if I can view it. For the Minnesota twist, please list in your log the year and cache that you have found.