Your mission in this turn based strategy game is to kill all aliens. Your first job is to select your team order. Your second task is to place the team in the deployment area marked by a red box. The red arrow on the deployment screen will give you your mission objective. Gameplay alternates between the Aliens moving and the Marines moving. You can command your marines to move or shot. Red boxes will appear on any squares the may move to. Red targets will appears on aliens that are within range of the marines. Clicking on the marine itself will spend an action doing nothing. Use YOUR MOUSE to control the game. You can check in-game tutorial for more details. Good luck!