Keisan Game: Sansuu 3 Nen ("Calculation Game: Math Year Three") is an educational game for the Nintendo Famicom and intended for older Japanese schoolchildren. It includes four mini-games with basic arithmetic problems. In each mini-game, the player simply has to locate the number which completes the sum on the screen in order to proceed. The mini-game themes for this game include: a submarine dodging depth charges, a man ascending through a skyscraper, a boy dodging UFOs with his jetpack and a car moving through a maze.
The game was followed by two games, each offering progressively more difficult math problems. Sansuu 3 Nen was released the same day as Sansuu 1 Nen and Sansuu 2 Nen on the 25th of April, with Sansuu 4 Nen and Sansuu 5+6 Nen released later the same year on October. None of the games were released outside of Japan.