Horror Gym Factory

a gym factory in 1999 named Gym For Everyone was a place for everyone, this was a gym factory for 13-20 ages of people, there was a 12 year old that sneaked in without security guards seeing, but the 12 year old went into some toxic black gases in the staff room and was never found again, the parents sued the gym factory, and the placed closed down after, now in 2019, you came to see this place, but it was dark and empty, but the doors closed behind you somehow, you regret everything, now you need to escape out the staff way, where the child was not seen again