A few days ago Warner Bros launched a PC demo version of their new game Watchmen: The End is Nigh. The demo version follows the first scenario, which should be enough for you to make up your mind on whether to buy the game or not.
The game is available for Xbox 360, PS3 and PC and can be bought and downloaded via Xbox-Live, Playstation Store and Steam at $19.99 USD.
The demo „weighs“ 520MB and you can download it here.