Those in the market for a new game that won't cost them a penny are in luck, provided they have an Amazon Prime membership. The next free PC game to be offered through Twitch Prime--which is one of the perks of an Amazon Prime membership--is now available, and it's a good one.

Civilization IV: The Complete Edition can currently be had for free on Twitch. It's available from now until February 21 and can be claimed from Civ IV's game page or by clicking the Prime Loot button from the Twitch website's top bar while logged into a Twitch Prime account. Bear in mind, you'll need to redeem this through the Twitch desktop app, rather than simply getting a code to redeem through Steam, but it's yours to keep even after this offer expires.

Although the Civ series is now two numbered entries ahead, Civ IV remains an excellent game that you can easily lose hundreds of hours in. The Complete Edition, which normally retails for $30, packages the base game with its Beyond the Sword, Colonization, and Warlords expansion packs, introducing even more content to a game that already offered a tremendous amount of gameplay.

Free games and DLC packs are periodically given out to members with Twitch Prime. Another is on the way shortly after this Civ IV offer concludes, as the original Devil May Cry will be free beginning on February 27. That precedes the PS4, Xbox One, and PC release of Devil May Cry HD Collection on March 13. PC owners can also nab another free game through EA's On the House promotion, which is currently giving away Dead Space.