World of Warships is a free-to-play naval warfare-themed multiplayer online game, developed, produced and published by Wargaming. Players can battle others at random or play cooperative battle types against bots or an advanced player versus environment (PvE) battle mode. For the most skilled players, two seasonal competitive modes are also available. The free-to-play structure is of the "freemium" type. Significant progress can be made without purchasing anything, but access to higher levels of play and additional warships becomes progressively more difficult without financial investment. World of Warships was originally released for Microsoft Windows in 2015. The computer version was followed by the iOS and Android mobile game titled World of Warships Blitz in 2018. The PlayStation 4 and Xbox One console versions, titled World of Warships: Legends, followed in 2019 and were released on the PlayStation 5 and Xbox Series X/S in April 2021. Gameplay World of Warships is a tactical, slow-paced shooter with three basic types of armament: ship artillery, torpedoes, and aircraft. The gameplay is team-based, and allows players to work as a team. Within a team, divisions can be established to allow a group of up to three players to join and fight battles together. The player's team can fight against other players (PvP) or against the AI (PvE) in several battle types. Co-op battles feature a team of players facing off against a team of AI-controlled bots, usually 9v9. Credit and experience rewards earned in co-operative play are notably lower than those earned in Random Battles (PvE), which are the most popular battle type in World of Warships. In Random Battles, captains are dropped into a game with other players according to the matchmaking system, with a majority of these being 12v12 battles. Scenarios pit a team of players against increasingly difficult waves of AI-controlled opponents in operations with unique objectives. In scenarios, players are allowed to queue solo, but are encouraged to gather their friends into a division; assembling a full division of 7 players will greatly increase the chances of success. Ranked Battles are a seasonal battle type and have restrictions to certain tiers of ships (usually from tier VI-X). A season of Ranked Battles is divided into sprints with a duration of 1–3 weeks each and comprises three Leagues - Bronze, Silver and Gold. Ranked Battles involve players progressing up a ladder-style ranking system in each League from a low rank (such as