Here is the rule from OHSAA:
6.1.1) A school may open its athletic facilities for unstructured free play provided the
activity is supervised by a school employee who may remove participants for disciplinary
reasons.
6.1.2) The school may designate the sport or sports that will be played during the free play
period, but may not limit participation to a select group of students from within the
school. Participation may be limited to students enrolled in the school.
6.1.3) There may be no designation of who will play on which team or who will play
whom. Only the students participating may be involved in selecting or substituting
players.
6.1.4) The regulation timing of games is not permitted.
6.1.5) Written scorekeeping is not permitted.
6.1.6) No individual invitations, written or oral, are permitted.
6.1.7) A coach, paid or unpaid, violates the provision of these regulations when the coach
requires, suggests or in any way implies that a student?s chance to be selected for an
interscholastic squad is contingent upon participation at an open gymnasium or
facilities program.
6.1.8) Mandatory attendance at open gymnasiums or facilities is not permitted.
6.1.9) Transporting athletes to an open gym is a violation for any member of the coaching
staff, paid or unpaid.