Möbius Front '83, the difficult turn-based strategy game from puzzle masters Zachtronics has seen a big free expansion adding in quite a lot.
So far, it seems like possibly the only Zachtronics title that hasn't become some kind of instant classic. However, they're clearly trying to make big improvements to it. Personally, I enjoyed it though and it is good but the challenge was tough and that's what put a fair amount of people off. This update is a nice step towards making it more approachable since you can dive in for a battle against the AI whenever you want to learn more, or against others online.
That's not the only addition. Because your ability to play as the enemy "Americans" is only unlocked when you complete the single-player campaign, they also added a brand new Soviet Army faction with over 20 units, including the T-72 Ural (an old tank but cheap tank that can be used to overwhelm your opponent), the paratrooper team (which can deploy directly to any open hex on your side of the map), and the BM-21 Grad (which launches four artillery attacks at a target in a single turn).
"The year is 1983 and the United States of America must defend itself from an enemy it could have never imagined— an America from an alternate universe that will stop at nothing to seize control of the country’s heartland!"