Sasa is a single-player action, shooter, casual, and puzzle game in which players control a character that must collect capsules marked with an 'E', often suspended by balloons, using bullets as the primary means of propulsion. In this game, the setting is a sci-fi universe where the player navigates through various levels to gather capsules while avoiding enemies and obstacles, with the game ending when the bullet count depletes. It stands out with its unique mechanic of using bullets for movement, the risk of losing bullets upon collisions, and its simple yet challenging gameplay that combines elements of shooting and puzzle-solving across multiple platforms including MSX and NES.