The listing, Steam Game Key: Castle has ended.
For sale is a redeemable game gift key for Steam. All keys are worth between $5 & $10 on the Steam Store.
(it is not an indie link) key is in this format:
RDML5-ML9JH-CH3K (example)
I don't know if this game will drop Steam Cards or not.
The game key is redeemed through the Steam Desktop Client, all the games are playable on the Windows platform.
Thanks for bidding and watching,
Please fan, and I will also exchange +Rep on Steam if the sale goes smoothly :)
Have fun and happy bidding!