The base game is a free to play MMO. http://store.steampowered.com/app/335820/
With the key you get a miniature black pet sheep that has the Steam symbol shorn into its fur. This sheep will follow the player around on his or her adventures.
I have never played the game but for those of you that play this game this might be a nice gimmick or decoration to have.
Anyway, it is free so what's the harm.
Enjoy.
Here is how to get it:
Register on the website.
Verify your email.
Once it’s verified, head on over to the ‘Giveaway’ section and claim your free key!
Here is some info at the game itself (from the website):
"Dream of Mirror Online is a free-to-play anime-themed MMORPG presenting land of wonders, friendship and skill, shrouded in the mysteries of an ancient world yours to explore. Forge relationships and find new friends, take up a job, or soar through the majestic skies as you rediscover a social MMORPG beloved by many around the world!
It is a time of myth and legend, where great heroes rise up to fight side by side, united against the instruments of destruction . Journey to a world linked by fate to another, a mirrored reflection of the chaos that has erupted within mankind. Reach for your destiny and become the hero you were meant to be, in Dream of Mirror Online!
Features:
- Anime styled graphics
- Four playable races, including beastman and spirit
- Rich gathering and crafting system
- Many professions to choose from
- Learn as many professions as you'd like
- Swap skills between professions
- Pet system
- Marriage system
- Relationship system: Friends, teacher/student, rival.
- Flying Mounts
- Dedicated in-game chatroom system
- Treasure Hunt Events and more!
cheers