Space Invaders is an arcade game developed by Toshihiro Nishikado in 1978. In these games hostile aliens come at you in a formation and you must shoot them without being hit. Save the earth from an alien invasion! You have your own ship in which you can fly about and dodge their fire. In some games you can also upgrade your cannons for more firepower. Some of these games will stick to the classic layout, others are very different. Which ones do you like best?