(from the World in Flames: 2008 Annual:)

FiF is an optional rule which introduces variety and greater detail into the construction and repair of units, as well as adding new units and options, yet adding little more complexity to the game (in some cases it's even simpler).
FiF can also be played with America in Flames and Patton in Flames.

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Supplement for the World in Flames family, included in the World in Flames: 2008 Annual.
Contains 200 counters and production charts for all the playing countries.