You woke up.
You find yourself in a room, with a flashlight in front of you.
You use it to solve puzzles, and you found out that something is watching you.
You started to chase this "person".
Lights is a all-new Alien Swarm modification that uses "Light" as the main point of the game, you will need to use it everywhere, solving puzzle, explore spaces, even to save your own *sorry* life. Also we moved all features from Half-Life 2 to Alien Swarm Engine, so this also a game update for Half-Life 2.