WASHINGTON - More than 12,000 gaming employees and their companies mobilized during the first annual American Gaming Association (AGA) Casino Charity Challenge, volunteering 4,266 hours of time and contributing $250,896 to more than 40 local and national charities, including Adopt-a-Highway, American Heart Association, area battered women shelters, community fire departments, March of Dimes, local Meals on Wheels programs, Multiple Sclerosis Society, senior citizen centers and the YMCA.