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Audio slideshow: Robot warriors clash at RoboGames

Hardware hackers come out to build the world's best bots.

SAN FRANCISCO--Robots of all shapes and sizes, with skills ranging from cocktail-mixing to flame-throwing, touched down here last weekend to compete in the sixth annual RoboGames, a geek paradise recognized by the Guinness Book of World Records as the world's largest open robot competition.

Coming from 21 countries and almost every state, the hackers and engineers who have spent hundreds of hours--and sometimes thousands of dollars--on their projects, came together at Fort Mason to test their bot-building skills over the weekend of June 12-14.

Watch this audio slideshow to join us in the build pit alongside contestants as they grind metal, wire batteries, and weld defensive plates to 300-pound monsters outfitted with deadly spinning steel blades.