Abstract: A system for detecting and controlling collusion in a game with a plurality of participating players The system (1) includes a gaming server (2) and a number of portals (3a, 3b) in the form of websites on the World Wide Web in the Internet. Each of the portal websites is an online casino website hosted on a corresponding casino web server (not shown). Each of the casino websites (3a, 3b) is accessible by one or more would-be poker players. Each player accesses the website using a computer with a display (5) and an associated pointing device (6). The system (1) includes an administration facility (13) which communicates with the gaming server (2) along a communication channel (12). There is also a collusion detection server (14) in communication with the game server (2) via communication channel (12).