Battle for Moscow

Before I get started on Korsun Pocket, I'd like to point out a neat little wargame called Battle for Moscow that can be downloaded (in paper form--not as a computer game) and played for free:

http://grognard.com/bfm/

Battle for Moscow is a beginner-level game that introduces many of the core aspects of hex-based strategy wargames such as Korsun Pocket.