連合艦隊コレクション is a free iPhone game developed by HUG Inc. Set in the era of imperialism, the game allows players to become Imperial Navy officers and command their own fleet of warships to conquer the seas.

The game features six major factions, where players must choose one to join at the start. Each faction is composed of commanding officers, fleet commanders, and staff members. In faction battles, players collectively decide on the target for their offensive, and the faction commander leads the members to launch a coordinated attack.

To defend occupied islands, players must strategically allocate their fleet to repel enemy invasions. The game introduces a unique warship COST system, where players have to consider the limitations of their faction's COST while making rational choices and training their warships. The changing weather conditions also add a tactical element to the gameplay.

With seven different types of warships to choose from, including aircraft carriers, battleships, and submarines, players can build their own invincible fleet. The game also allows players to freely coordinate various formations, such as triangle formations and echelon formations, to control the intense naval battles.

Players can embark on expedition battles to earn rare bonuses and discover legendary showdowns and treasure chests. The game also features a World Power Competition, where players can compete for naval dominance by quickly occupying key islands and expanding their resources.

With an embedded warship review system, players can evaluate and browse through reviews to aid in their strategies. Additionally, daily logins reward players with abundant resources such as diamonds, gold coins, and oil.

Experience the thrill of commanding legendary warships, seizing enemy territories, and engaging in intense naval warfare in 連合艦隊コレクション.