The haunt is on level ground, built out of 2 x 4 construction and the rule is Touch nothing and no one will touch you. We only let 4 in at a time. All props are secured down as well and no sharp edges anywhere. Been doing haunts on the front lawn (two different locations) for 30 years now. The only incidents we ever had was someone peed them selves, lots of lost candy, costume parts, flashlights that got left behind. (knocking on wood)