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- Sudden Strike 4 – Finland: Winter Storm offers two small campaigns with six new missions based on the Soviet offensive against Finland during and after the Winter War – up to the Vyborg-Petrozavodsk Offensive in 1944.
- In the Soviet campaign, you must capture the village of Suomussalmi, protect the railway leading to Murmansk from the combined forces of Germany and Finland, and break through the Finnish defense lines during the Vyborg-Petrozavodsk Offensive. In the Finnish campaign, you must recapture and hold the village of Suomussalmi while stopping Soviet reinforcements, retake the Lähde sector, and hold the last line of defense in the Battle of Tali-Ihantala.
- Three new commanders – three new doctrines: Finnish artillery expert Vilho Peter Nenonen, Finnish tank general Ruben Lagus and the famous general Karl Lennart Esch – each offer their own tactical approach to each mission.
- Sudden Strike 4 – Finland: Winter Storm features 19 brand new vehicles, including new wrecking vehicles, Soviet KV-1 and BT-7M tanks, as well as Finnish Stug III G and Flak 36.