"Lonely Moon" is a free online knowledge level game, about the Earth's natural satellite.
A small picture test game for desktop computers,
laptops and tablets, which may be played in the web browser. Mark and remove the wrong moons with the mouse.
The Astronomy Knowledge Board include 9 wrong moons, a correct one, and size comparison to play with.
The game is part of the Interactive Astronomy Observatory educational tools. Small fun quizz.