The best-selling MMO gaming mouse of all time is the Razer Naga and it was recently updated for 2012. This MMO gaming mouse optimized button placement, three interchangeable side grips to suit your personal grip style, and is powered by Razer Synapse 2.0. Razer says this mouse with the 12-button thumb grid was engineered for comfort, control and help you have a leg up over your competition in the games. Legit Reviews