745 ILCS 41/15

If the operator posts a notice in a conspicuous place near each bowling center entrance and exit in the form described in Section 10, the operator, except for willful and wanton misconduct, shall not be held civilly liable for injuries resulting from a slip, trip, stumble, or fall inside the bowling center solely caused by some substance or material on the bowler's bowling shoes that was acquired outside the bowling center immediately before entering or re-entering the bowling center.