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 15 participants.

https://exba.herokuapp.com/join/zynm7ax9w0/

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://exba.herokuapp.com/InitializeParticipant/qsbmej3h
P2 https://exba.herokuapp.com/InitializeParticipant/61sif9ke
P3 https://exba.herokuapp.com/InitializeParticipant/t2lqk1pc
P4 https://exba.herokuapp.com/InitializeParticipant/1pq3rlag
P5 https://exba.herokuapp.com/InitializeParticipant/p9jytlfy
P6 https://exba.herokuapp.com/InitializeParticipant/a7i47igv
P7 https://exba.herokuapp.com/InitializeParticipant/vgpf90gz
P8 https://exba.herokuapp.com/InitializeParticipant/akzb5wgh
P9 https://exba.herokuapp.com/InitializeParticipant/l8vlchi5
P10 https://exba.herokuapp.com/InitializeParticipant/u68tyt5b
P11 https://exba.herokuapp.com/InitializeParticipant/2hz1n4z6
P12 https://exba.herokuapp.com/InitializeParticipant/q1g8wmel
P13 https://exba.herokuapp.com/InitializeParticipant/u880cep2
P14 https://exba.herokuapp.com/InitializeParticipant/id5rodxl
P15 https://exba.herokuapp.com/InitializeParticipant/71rdsq3b