When I was a young girl, my sister and I played a game where the carpet was on fire and we had to leap over barriers in order to dodge the flames.I never shared this information with my kids, but somehow they came up with something similar. Instead of being filled will mere fire, their floors were covered in virtual lava: hot, fun and timeless, except in their era the game was known as “Fear Factor.”My grands visited recently and set up an obstacle course in the living room. They leapt from pillow to pillow, walked across a balance beam ...