The original book of “Ready Player One” had a secret ARG, not unlike the one the main characters in the book take on. But as far as anyone can tell, no-one found it or even thought to look for it. Ten months after publication, the author Ernest Cline finally made an announcement about it. The “trailhead” (starting clue/puzzle) was hidden in an almost identical way to the one in the story, and there was an empty leaderboard on his website just the same, too, but somehow no-one picked up on any of it. It must have been driving him and the publishers mad.