Space Invaders '91 is a 1991 Arcade game released on the Sega Genesis. Mark said that it looks wonderful. He said it's very easy for the first two rounds, but then becomes very challenging. He also said the gameplay is pretty much unchanged. He noted that you were being timed. He said it wasn't the most affordable game on the system. He liked the weapon powerups. He said many levels have simpl touches that really make up the gameplay. He recommended it.