Here is another classic video game from the '70's. Try to land your Lunar Lander on each of the landing pads in successive order. Use your left and right arrow keys to change your pitch, and the spacebar to fire your thruster.
This game give a good demonstration of a mathematical concept called Vectors.  A vector is defined as a quantity, such as a velocity or force, which has direction as well as magnitude. In other words, as your Lander flies, its flight can be described by two numbers, its direction (such as 0° straight up, 180° straight down or anything in between) and its speed (as in 10 feet per second, or 10 miles per hour).