Originally Posted by Darth Marsden
Sure? I thought Serious Sam: Double D used Steamworks.
The page is down now, but there was a bit of text under Double D that very directly said "Steamworks".
My guess is there aren't Steam keys for the other games, though. I know for a fact that Get Games, the store that is running this bundle, distributes Frozen Synapse without Steam keys normally through their own storefront, so I wouldn't be surprised if that's how it worked here.