Firaxis’ XCOM 2: War of the Chosen owners have recently received the Tactical Legacy Pack, a DLC drop that adds new gameplay modes and maps on top of the current game. It’s also free for expansion pack owners, but only until December 3rd.

Good thing there’s a 40 discount period for War of the Chosen until October 16th. If you’ve yet to experience the game at all, then the XCOM 2 Collection is also on sale for 61 percent off.

As for the Tactical Legacy Pack, it brings six new Legacy Ops, which detail events that took place between XCOM: Enemy Unknown and XCOM 2. The Resistance Archives also presents a series of missions that increase in difficulty as you go along. Skirmish Mode lets you create your own custom missions and tweak settings like squad loadouts, objectives, maps, and so on.

If that weren’t enough, 28 maps remastered from XCOM: Enemy Unknown and Enemy Within have also been added, along with new weapons, armour, customization items, attitudes, and more.

It’s been almost six years since Firaxis and 2K Games revived the X-COM franchise with XCOM: Enemy Unknown. With the series having received a sequel with XCOM 2 and its expansion War of the Chosen, Firaxis has announced even more content for PC owners of both. It’s called the Tactical Legacy Pack, and it will release on October 9th.

If you own War of the Chosen (or the XCOM 2 Collection), then the Tactical Legacy Pack is completely free. This is only for a limited time however – after December 3rd, you’ll need to pony up $7.99 to own it. It’s an interesting tactic, not unlike that seen with A Hat in Time’s recent Seal the Deal DLC. Even if this offer is meant to accelerate sales for XCOM 2: War of the Chosen, there’s lots of content to experience in the Tactical Legacy Pack.

Six new Legacy Ops, Skirmish Mode for creating and playing your own missions, over 100 War of the Chosen Challenges that can be played offline, and 28 new maps are available. Some of those maps are remastered from XCOM: Enemy Unknown and Enemy Within as well, providing a nice bit of nostalgia. Head here for more information on the expansion.