Publisher Slitherine is giving away three gems from its catalog of grand strategy and wargames, including the surprisingly strong Battlestar Galactica Deadlock, in a deal that saves you more than $100. This trio of free games leads the studio’s 25th anniversary Steam sale, which is packed with discounts and bundles that include the likes of Starship Troopers: Terran Command, Terminator: Dark Fate – Defiance, and the recently released Broken Arrow.