UCV (Unique Constraint Violation) is a websockets-based web game that is loosely based on Liar Game's Minority Rule Game (少数決ゲーム).
Essentially, you pick between A and B, and the group with the smallest number of people wins.
Player: http://51.79.255.6:8080/
Organizer Panel: http://51.79.255.6:8080/organizer-panel (use "minorityrule" as access password)