Munzee ... so this is a more recent invention, probably been going about 4 years. Essentially it's another GPS based treasure hunt but it's meant to be quicker and more accessible. Munzees come in several different types, but the main ones are basically QR codes. They are fairly small stickers, and get stuck just about anywhere ... lamp posts, back of signs etc. You have to find them using an app on your phone, scan them in and you then collect points for each one.
The basic "green" munzees are worth 5 points each, there are various other types worth different amounts of points, and some like the Mystery ones get you a random amount of points between 5 and 50.
There are also Virtual Munzees, as long as you are within 300 feet you press "collect" on the app and it gives you the points straight away.
One of the more interesting types are trail munzees, you find the first one on the map and once you've located it and scanned it in, the second one pops up. There are 5 in a trail, and each one is worth more points.
You can print off and "deploy" your own munzees, the basic ones are free (although you can buy them as printing waterproof stickers isn't easy). One of the advantages of deploying your own munzees is that you get points when people find them, so for a normal one where you get 5 points for finding it, the owner gets 3 points each time it's found. For a mystery munzee, there are 50 points up for grabs ... the finder will get between 5 and 50 points, the owner gets the rest.
http://www.munzee.com/?homeThe advantage of Munzee is that you pretty much always have your phone with you, and almost everywhere you go there will be some near you. You can scan them in quickly and the points rack up pretty quickly.
Munzee also seem to be a lot more proactive with doing events and extras, they recently did a huge push for a charity, charging $1 for each "candy heart virtual munzee" they sold and offering a lot of points, but they all vanished after a month. There were quite a few candy heart fields made, where there were literally hundreds of candy hearts, in some instances they had set up a spreadsheet with strict locations listed, in order to make pictures or spell out words you could see when looking at the map. 100% of the money went to the charity, and they raised well over $150,000 in the month.
If you want to give it a try, download the app and fire it up at the next meet ... I've put a couple of Virtual Mystery Munzees out for you.
Russell.