The Jewel of the Nile DLC can be bought with the same discount
Serious Sam 3: BFE, a very serious first-person shooter and one of the launch titles on Steam for Linux, can now be purchased with a discount of 80%.This is not the first time that Serious Sam 3 gets a massive discount in Steam for Linux, but if you didn't get it by now, you should not miss this chance.
The game is not the only one on sale. The same discount also applies for the Jewel of the Nile DLC, Serious Sam 3 Standard – Four Pack, BFE Deluxe Edition, and even for the Serious Sam Complete Pack.
Because this is a Steam promotion, a game bought on one platform, Linux for example, will be available on the other operating systems as well.
If you are interested in Steam's offer, check out the official Serious Sam 3 Steam website.