Lunar Lander is a genre of video games loosely based on the 1969 landing of the Apollo Lunar Module on the Moon. In Lunar Lander games, players generally control a spacecraft as it falls toward the surface of the Moon or other astronomical body, using thrusters to slow the ship's descent and control its horizontal motion to reach a safe landing area. Crashing into obstacles, hitting the surface at too high a velocity, or running out of fuel all result in failure. In some games in the genre, the ship's orientation must be adjusted as well as its horizontal and vertical velocities.