Welcome Defender, your mission is to survive as many waves as you can of alien attacks, get score by destroying aliens and prevent them from getting away. 0 [Normal Mode - 10 health survive as long as you can] 1 [Free Play - Infinity health and access to all guns] 2 [Hardcore Mode - 1 health sudden death] Assault alien (Green) speed - Normal Health - Low Score - 25 Elder alien (Red) speed - Normal Health - Normal Score - 200 Speed alien (Light blue) Speed - High Health - Low Score - 50 Tank alien (Gray) Speed - Low Health - High Score - 50 Scout alien (Yellow) Speed - Normal Health - Low Score - 50 Special - Fly's over walls Mother Ship alien (Purple) Speed - Normal Health - High Score - 500 Strike Force alien (Blue) Speed - Low Health - Massive Score - 2000 Special - +1 health O-Mega aliens (Custom) Speed - Stiff Health - O-Mega Score - 10 000 Special - Rare spawns, +Score