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/w6t8mfb81f/

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/fq7ym95l
P2	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/6zpy86l5
P3	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/3z2vykkp
P4	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/qy1i6ytl
P5	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/vkhw4dw1
P6	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/tixogrlq
P7	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/6ggllme8
P8	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/q9ejept1
P9	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/3qhpud79
P10	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/jhubxj5y
P11	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/0ry39fia
P12	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/h122fbzz
P13	https://floating-sierra-61355.herokuapp.com/InitializeParticipant/1xscvsf1