The title screen consists of only two options: "Play" and "How to". "Play" starts the game, while "How to" shows a small legend of enemies, weapons and controls. Mouse click on either option to start. You have a health bar that is depleted when damaged by aliens, or hit by a grenade blast. Once the bar is depleted, the game is over. You may choose the "Play Again" option to restart the game or submit your score.
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