Step into the world of the Outsiders in Dishonored: Dunwall City Trials, the first expansion to the critically acclaimed first-person action game from Arkane Studios. Your combat skills, stealth and mobility will be a real test as you complete 10 different maps with many challenges. Creatively combine your supernatural abilities, weapons and gadgets to destroy as many targets as you can, fight off waves of mobs, guards, weepers and thugs, or eliminate targets in a non-stop kill streak from above. Dunwall City Trials also features a new set of achievements and trophies, as well as a global online leaderboard.
Functions:

Ten unique challenges. Experience Dishonored's flexible combat system, stealth gameplay and unique settings in a whole new way as you complete time trials and scoring in the Dunwall City Trials. Put your assassination skills to the test by combining your supernatural powers and gadgets to take down enemies and collect clues to identify and destroy your target. Try your hand at non-lethal challenges by shooting down whale oil tanks falling from the sky, or infiltrate a mansion to collect loot invisible to your enemies.
Global online leaderboard. Your high scores and placement in each challenge will be recorded and displayed on the global online leaderboard. Every point and every second counts against the best of the best.
New achievements and unlockable gallery. In addition to an all-new set of achievements and trophies, an image gallery filled with original concept art and other surprises can be unlocked as each challenge progresses and each of its various goals is achieved.

Key activation:

1. You need to download and install Steam http://steampowered.com/download/SteamInstall.msi (if not already installed)
2. Register a new account on Steam or log into an existing one.
3. Go to the "My games" section and select "Activate via Steam" and enter the key received immediately after payment.
4. After activation, the game will appear in the list of games and you can download it from Steam.