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 13 participants.

https://floating-sierra-61355.herokuapp.com/join/yzdg9no5e3/

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/q8da46fu
P2	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/29bdrqli
P3	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/j9k0wiw7
P4	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/jxoz1ct7
P5	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/1cb1z1nw
P6	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/u5z7yyov
P7	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/zuimwou5
P8	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/1a2z1n28
P9	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/6eczg455
P10	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/ki4l7vnk
P11	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/a3fvad5t
P12	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/z0towe42
P13	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/a31zn35x