rhyb - it is addictive!! lol and be prepared to want to spend A LOT of money on some very cool MCN and other goodies!
The extreme sites are VERY Hard for the most part, the others are more time consuming than anything else and there are quite a few sites that participate.
It is great fun though and a fab way to find new and exciting products


ETA: Got my first one! lol off with an easy one, Silly Gilly