In 1999, game developer Mike Mika was working on adapting the Atari game "Klax" for the Game Boy Color. When he finished ahead of schedule, he decided to slip a little something extra into the game -- a marriage proposal.

In a recent interview with Wired, Mika explained that his then-girlfriend (and now-wife) really liked puzzle games like "Klax." Once the game was released, he spent three years urging her to play it so that she would uncover the proposal -- but she never did.

Years later, video game magazine Tips & Tricks was doing a special issue spotlighting game codes that had never been made public before. Mika submitted the "Klax" proposal code, which was later published in the magazine along with a shout-out to his girlfriend.

One night, he left the magazine open for her with the game all cued up.

"The rest was history after that," Mika said.

From: http://www.huffingtonpost.com/2013/07/31/video-game-proposal_n_3683730.html