MindPlay was a technology designed to monitor blackjack players' actions while playing in a casino, first released in 2003 and discontinued in 2007.
Monitoring a person's play traditionally is done visually, by the dealer, floorperson, pitboss, and the eye in the sky (video surveillance).
Because MindPlay tends to thwart their efforts to beat a blackjack game, card counters generally avoid casinos which use the system and its competitors, and often circulate news of such installations on various Internet sites.
Some card counters have tried to make the general public aware of the use of these systems, in an effort to convince others not to patronize the games.
The product was plagued by a host of problems, from the cameras not staying calibrated, to the controller boards malfunctioning.