All of our rooms are private so, unfortunately, if a room has already been booked you cannot join that group.
One thing that sets Fox in a Box - Chicago apart from other escape rooms is that all of our rooms are fully private and therefore it would be inappropriate to have you join another group. Most likely we do have other rooms available and you are welcome to play them by yourself or with a group up to 6. Playing a room myself is doable, but very difficult and please note that you will have to pay for the minimum of 3 layers.
Here are some links that may be helpful: