In case you haven't heard, gamers are really, really interested in playing video games in 3D. At least that's what we're constantly being told by PR reps, anyway. From Nintendo's newly debuted 3DS to Sony's line of 3D-ready HDTVs, a large portion of the industry believes 3D will play an important role in the future of video games. But for veteran gamers the promise of 3D gaming is nothing new; developers have been trying to create stereoscopic games for more than 20 years, to varying (though usually dismal) levels of success. Join us for a look back at the best and worst attempts at 3D gaming.

3-D WorldRunner (NES, 1987):
The first time I saw 3-D WorldRunner, its forward-scrolling action and surreal landscapes blew my adolescent mind - and that was before trying out the 3D glasses. The game used anaglyph imaging to create its 3D effects, which is really just a fancy term for those red and blue cardboard glasses that seemed way less dorky in the '80s. Developed by Square, WorldRunner had some major star power behind it: Hironobu Sakaguchi, Nasir Gebelli, and Nobuo Uematsu all reportedly had a hand in creating the game before moving on to Square's staple franchise, Final Fantasy.

Rad Racer (NES, 1987):
If you couldn't tell by the visual similarities, Rad Racer was Nintendo's answer to Sega's Out Run. It was the second NES game developed by Square to feature anaglyph-based 3D, which helped set the title apart from Sega's popular racer. The game was also featured in the 1989 Fred Savage classic, The Wizard, further legitimizing its use of the word "rad" in its title.

Space Harrier 3-D (Sega Master System, 1988):
Space Harrier 3-D's checkered floors and fleet-footed protagonist may look strikingly similar to what WorldRunner delivered, but don't blame Sega: the original Space Harrier was an arcade game released over a year before Nintendo's knockoff. The Sega Master System installment of the series is the only title to feature a 3D mode, thanks to the system's SegaScope 3-D peripheral.

Other SegaScope 3-D Games (Sega Master System, 1988):
Although it never gained widespread popularity, the SegaScope 3-D was an impressive peripheral. Unlike tinted anaglyph glasses, SegaScope 3-D employed actual LCD shutter glasses, similar to those used with modern 3D-ready HDTVs. Shutter glasses get rid of the discoloration caused by anaglyph glasses, resulting in a better image quality. Despite this advantage, SegaScope was a colossal failure, and only a handful of games were released for it, including Zaxxon 3-D, Missile Defense 3-D, and Out Run 3-D.

Virtual Boy (1995):
Speaking of colossal failures: Possibly Nintendo's most infamous flop, the Virtual Boy was a short-lived console that used LEDs and oscillating mirrors to create a projected 3D effect. While the sense of depth was impressive, the console was only capable of projecting a monochromatic image, its one color being red, much less. The system also had to stay in a fixed position, requiring players to hunch over a table in order to play it correctly. The Virtual Boy had the potential to cause severe eyestrain as well, to the point where the system would automatically pop up a message every 15 minutes encouraging the player to take a break. Nintendo also warned that children under the age of seven shouldn't play the Virtual Boy, because their eyesight hasn't fully developed yet, and the console could cause permanent damage - much like getting punched in the eyeball by a cybernetic boxer:

"Move your child's underdeveloped eyeballs closer to my fist, please."

These problems proved fatal for the Virtual Boy, and Nintendo abandoned the console the year after it was released. Only 14 Virtual Boy titles were released in the US, including 3D Tetris, Mario's Tennis, Teleroboxer, and Virtual Boy Wario Land. The failure of the Virtual Boy is also rumored to be the reason legendary designer Gunpei Yokoi left Nintendo in 1997. If there was any good to come out of the Virtual Boy, perhaps it's that Nintendo learned from the doomed console's mistakes and made the 3DS far less intrusive.