1. Cicada 3301
Cicada 3301 is the name given to an unknown group that burst forth on the internet early in 2012. They allegedly posted an image that held a secret message that urged those interested to find it. This message spurred would be solvers to collaborate all across the globe. As of yet no information on the groups has been found. Those who have claimed to get to the end of the tests have not been forthcoming with any information on the group.