A guy named Jack, along with his robot landed on an unknown planet. Exploring it, your character was attacked by monsters that live in this world. You in the game Monster Defense will have to help the hero protect himself and his robot from monsters. In front of you on the screen you will see your character armed with a spear. Monsters will move towards him. You click on the character with the mouse to call the dotted line. With it, you can calculate the strength and trajectory of the throw. Do it when you are ready. If you calculated everything correctly, then the spear flying along a given trajectory will hit the monster. Thus, you will destroy the enemy and get points for it.