Like Banksy, France's mystery 'Invader' marks cities with art. He could surprise the Paris Olympics

For the Paris Olympics, it could almost be a new sport: Score points by hunting down mosaics that a mystery artist who calls himself “Invader” has cemented to walls across France’s capital, the world and even had carried aloft to the International Space Station.

Vincent Giraud, one of the artist's Parisian fans, is already an avid player. He downloaded Invader's addictive “Flash Invaders” mobile-phone game that awards points to users who find and photograph the colorful and quirky pieces of pixelated art.