Decisive Campaigns: Case Blue simulates the German drive to Stalingrad and into the Caucasus of the summer of 1942, as well as its May preludes (2nd Kharkov offensive, Operation Trappenjagd) and also the Soviet winter counter-offensive (Operation Uranus) that ended with the encirclement of 6th Army in Stalingrad.
Old school game where the focus is on solid gameplay not explosions and screams
I played Shadow Empire, then DC: Barbarossa (great fun!), and then this. This is the oldest of the three, and it shows.. but the engine is still great for a wargame, and this includes the various 1942-1943 scenarios so there is variety. Definitely a thumbs up if you're interested in revisiting the eventual disaster that was Fall Blau.