You can either use the session-wide link, persistent links, or single-use links.

Session-wide link

If it is impractical to distribute distinct URLs to each participant, you can give the following start URL to all 9 participants.

https://floating-sierra-61355.herokuapp.com/join/gdmckygs0f/

Note: unlike the other link modes, this does not prevent the same person from playing twice.

Persistent links

If you want to give your participants permanent links that don't change, you should create your session in a room.

Single-use links

Below are single-use links, which you can distribute to your participants. Each link has a unique code for the participant.

P1	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/epedvtsy
P2	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/3bbeimgy
P3	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/yfs1x2qe
P4	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/6nl8lo6s
P5	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/bp1z29oh
P6	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/pm8qokqi
P7	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/7a9b4rcz
P8	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/d7kj74pw
P9	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/k88j1nlw