The Total Annihilation: Commander Pack comes with two expansions for the game called The Core Contingency and Battle Tactics, both of which add missions to the campaign and additional units to the game. Total Annihilation lets players build armies in a futuristic world full of flying ships and giant mechs in either multiplayer or single player modes. The Total Annihilation giveaway is part of GOG.com’s annual summer sale which included discounts of thousands of other games as well. GOG.com is giving away one of the best real-time strategy games ever, along with a couple of its expansions, in the Total Annihilation: Commander Pack.