"Rank 10") towards a high rank, with Rank 1 being the pinnacle of the ladder. Clan Battles are a special battle type, only available at specific times and restricted to certain tiers of ships. A team is formed from within a single Clan by at least one officer. Brawls are a specific battle type that have a shorter duration of several days, but long availability during the day. Brawls are held in small formats such as 1v1 or 3v3, and support participating either solo or in a division. The Training Room allows players to generate fully custom scenarios on a map of their choice, choosing the duration of the game, the team configurations, and even the exact number of ships on each team. Unbalanced teams are allowed. The game also has four basic game modes, which may occur with any of the battle types. Standard battles, a classic game mode involving teams, each with their own base; Domination, which features several key areas on the map that grant points when captured; Arms Race, which focuses on improving the characteristics of the player's ships by capturing key areas; and Epicenter, which includes a large area of concentric circles at the center of the map (and in some maps other key areas) where the objective is to capture and hold the entire central area. The warships presented in the game cover periods from the early 20th century, at the dawn of dreadnought battleships, up to warships from the 1950s, including many ships that were planned but never put into production. The game has four different types of ships that each offer their own style of play: destroyers, cruisers, battleships, and aircraft carriers. Submarines have been added to the game as part of testing as of update 0.9.4. The game features navies of major naval powers including the United States Navy, the Imperial Japanese Navy, the Royal Navy, the French Marine Nationale, the Imperial German Navy (later Kriegsmarine), the Italian Regia Marina and the Imperial Russian Navy (later the Red Fleet). Dutch, Commonwealth, Pan-European (mainly Swedish), and other smaller European navies are also represented, along with a Pan-Asian tree featuring ships from various East and Southeast Asian navies, and a Pan-American nation featuring ships from the navies of the South American countries (such as Brazil and Argentina). For game purposes, each ship is placed in a tier to facilitate balanced matchmaking. There are