Quartet is a platformer game where Mary and Edger, a duo, must navigate through six rounds of enemy-ridden levels to find the casket of Queen Cynthia. The player's goal is to reach the end of each round as quickly as possible while managing their vitality, which counts down throughout the game. Defeating a boss at the end of each round rewards the player with a key that unlocks the next stage.
The gameplay in Quartet requires players to jump and jetpack across obstacles to progress through the levels. The countdown system adds an element of urgency, making it essential for players to complete each level efficiently. Awarding bonus points and medals for high scores encourages competition among players, adding a layer of replayability to the game.