ST. LOUIS - Christmas finally arrived at Jim Henvick's house several weeks ago.
After four months of waiting, the gift he most wanted came: one of the wildly popular Nintendo Wii game consoles. The $250 systems are in such demand that retailers sell out quickly. Mr. Henvick got one at a video game store minutes after it came off the delivery truck.
Later that day, Mr. Henvick started to play - and did not stop for four hours.
"I noticed that my arms were getting sore; I was having trouble lifting them over my head," said Mr. Henvick, 35, of Ballwin, Mo. "So I finally had to stop for the night. If it wasn't for the soreness, I probably would've kept going. I was pretty sore the next day, too."
Stories abound of Wii gamers' playing so intently that they sprain muscles or tear tendons. Some gamers, in their exuberance, hurt bystanders or damage objects nearby. The Web sites WiiInjury.com and WiiHaveAProblem.com post photos and video of the worst examples.