Psychologists Daniel Simons and Christopher Chabris are co-authors of "The Invisible Gorilla, " a forthcoming book explaining why humans so often fail to observe information that should be obvious.

WSJ: The Intelligent Investor: Most Risks Hide in Plain Sight

The two biggest challenges, according to Mr Chabris, are ensuring the games are fun to play and convincing recruiters, who typically make no attempt to measure cognitive skills, to pay attention to these new data.

ECONOMIST: The gamification of hiring

According to Chris Chabris of the Centre for Collective Intelligence at MIT, a member of the Knack team, games have huge advantages over traditional recruitment tools, such as personality tests, which can easily be outwitted by an astute candidate.

ECONOMIST: The gamification of hiring