Ring the Bell! (Sonne la cloche !)
Pass-the-bike sprint party game for several riders on one trainer
IndieSource available

About
Free, open-source browser game (Chrome/Edge, Web Bluetooth) where riders take turns sprinting 30 seconds on one trainer; a calibration round gives each rider an individual gradient to balance kids and adults. No cookies, trackers or ads.
Sources
sonnelacloche.enavarro.eu/fr/
reddit.com/r/IndoorCycling/comments/1xdvs0n/a_small_party_game_for_several_riders_on_one_home/
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