TopFreeGame Mars Encounter 2011-10-26 Mars Encounter Space Invaders Games 1 Player Games Arcade Games Mouse Skill Games Shoot 'Em Up Games Defend the planet from the Martian invaders fighting them in this new version of Space Invaders game. Choose the difficulty level and begin the game. Move your ship using the mouse and shoot using the button. You can choose the image quality too. Alternative content Play Mars Encounter Full Screen Mars Encounter (Full Screen Play) Mars Encounter Game Controls Use mouse to move, left click to shoot.