GamersGate are running a Europa Universalis IV weekend sale, with the game and all DLC available at a 75% discount.
Grand Strategy fanatics will have probably already delved into this exceptionally deep take on the genre, which received rave reviews and is generally considered to be the best in the venerable series. Indulge in true exploration, trade, in-depth diplomacy and, when all else fails, all-out warfare.
Newbies can also grab the Paradox Grand Strategy bundle for £20.00!