I didn't think I'd recommend any of the games in the Anomaly series but this one stood out among the rest. I only played the single-player campaign so that's what this review is based on. With that said, the story of the game definitely has a much broader feel compared to the previous ones as it takes place across three continents as humanity struggles against the machines for survival and a better tomorrow. It also has two endings which are determined by your decision in the final mission.
The gameplay, units and towers are pretty much the same as the previous games with one difference: each unit can transform which repurposes it for a completely different function, so the amount of different units is essentially expanded to 10, each of the five purchasable units can be switched to its counterpart by simply double-clicking it at will on the battlefield. Still, the game is fairly simple and has four difficulty modes that can be chosen before the beginning of each mission.
Again, I recommend this one over the others and perhaps the only reason to play the others is for what little storyline they have leading up to this one but it can still stand by itself because the opening cinematic can get the player up to speed on how Earth was thrown into a perpetual Winter. So I suppose it's safe to ignore the others and only play this one!