Mich. Comp. Laws § 691.1584

Sec. 4. (1) If an operator posts a notice as required by section 3, the operator is not civilly liable for injuries to a bowler resulting from a slip, trip, stumble, or fall inside the bowling center substantially caused by a substance or material on the bowler's bowling shoes that was acquired outside the bowling center before the bowler entered or reentered the bowling center. (2) The protection from liability under this section does not apply if the injury results from acts or omissions amounting to willful or wanton misconduct or if the operator fails to maintain the premises in a reasonably safe condition and the condition substantially causes the injury to the bowler.