World of Warships is a free-to-play naval warfare-themed massively multiplayer online game produced by international game developer and publisher Wargaming. The game features aspects similar to World of Tanks and World of Warplanes, having several types of warships fulfilling different roles within teamed player versus player battles. Besides random battles against others, player can play cooperative battle types against bots or an advanced PvE battle mode called Operations. For the most skilled players, two seasonal competitive modes are available – ranked and clan battles. The game was released for Microsoft Windows on September 17, 2015.