"...Perplex city is one of a number of alternate realty games that blur the boundaries between the real and the virtual worlds . It uses real world events and clues planted on the Internet, television and newspaper to guide players on a real-life treasure hunt ..."
Players from 92 countries have been trying to solve the clues on the web and around the world in search of the "Receda Cube", an "artefact" hidden in a secrete location.
Recently a man from UK, after almost a year play, following clues of a real life event, tracked the "Receda Cube" down to Wakerly Great Wood in Northamptonshire, winning £ 100.000 as prize.
A new Perplex City game will start later this year, so...eyes open and good luck !
Read the whole story from BBC news here