Online gaming can take many forms including massively multiplayer online games accessed through websites or downloaded games. There are several main genres including action, fighting, adventure, role-playing, simulation, strategy, shooting, racing, sports, rhythm, and puzzle games. Games are promoted through word-of-mouth, online advertisements, television commercials, and billboards. Payment options vary by platform but include purchasing codes from stores, using credit cards, mobile payments, and PayPal. While gaming has pros like high-quality experiences, it also has cons such as high up-front costs and potential for eye strain on small screens.