Online Game:

Currently Memoir'44 Online does not support Overlord.

Editor:

The Memoir'44 Editor has an option to create scenarios with the Overlord (double-wide) board.
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The Overlord option can be found under "Board Format" or the Battle Info Tab.

Summary of Rules:

Overlord Rules can be found in several locations:
  • Overlord Rules pdf
  • Overlord Pack pdf
  • FAQ pdf
  • Air Pack Overlord FAQ pdf
  • Pacific Theater pdf
Links to Days of Wonder's Memoir'44 Goodies page to follow.
Currently in progress on Boardgamegeek.com is an Overlord Summary page, where you can also post comments and questions.