A toxic-green glow and eerie, billowing fog have taken up residence at Whirlie's World in Middlebury. In early April, the family-fun center known for its arcade rooms and bounce houses opened Alien Storm Laser Tag, allowing visitors to zap each other in an intergalactic invasion. "There's no other arena like it," says owner Peter "Nerf" Neff. The 2000-square-foot facility, installed by Florida-based laser-tag experts Budget Arenas, has a unique layout and color scheme; strobe lights and extraterrestrials painted on the walls add intrigue to the 16-player sport. Players can sign up for single games, family packages and laser-tag birthday parties.