A strange little side quest
The rules may be simple on screen, but the backstory around Math Rockets Subtraction is anything but tiny. Humans did not see the Moon's far side until a Soviet spacecraft flew past it in 1959. The broader history adds one more wrinkle. The Oregon Trail began in 1971 when three student teachers created a computer simulation to help Minnesota schoolchildren learn American history. It is a good reminder that simple game mechanics can carry a surprising amount of history.
