Decisive Decks is a strategic card game that immerses players in World War II naval warfare through deckbuilding and turn-based combat. Players can choose to command fleets from the United States, Japan, Britain, or Germany, each with unique strengths and mechanics. The game allows players to issue commands through cards, such as launching air strikes or executing torpedo ambushes, while managing resources and planning their moves carefully based on enemy intentions.

As players progress through the campaign, they can build and upgrade their decks, gaining new orders and enhancing their strategies. The game features real historical locations and events, adding depth to the gameplay experience. With a focus on adapting tactics to various battle scenarios, Decisive Decks combines historical elements with engaging strategic gameplay, rewarding players with Merit to unlock new ships and aircraft as they advance through their naval campaigns.