The Folio Game Series provides dozens of games using the same 8-page Standard rules (Musket & Saber for 19th century battles, Fire & Movement for 20th century battles, Fire & Movement World War I for WWI battles, Battles of the Medieval World for medieval battles, & Pike & Shot for early gunpowder battles) with a short Exclusive rules sheet for each individual game to capture the unique aspects of each battle. These standard rules are an update of the SPI classic folio/quad game rules and provide for greater historical accuracy. For example, now cavalry and artillery have their unique characteristics in the Musket & Saber series – artillery conducts bombardment to disrupt infantry and cavalry can charge, and infantry can form squares, skirmish or charge.
The folio game series takes only minutes to learn and once one game is played, players can immediately play many more scenarios with the same standard rules. Most folio games have a 17” x 22” map and 80-100 counters so set-up takes only a few minutes and most games take 60-90 minutes to play. The folio games are presented in a folio rather than a box for easy storage.
(from series web site: http://shop.decisiongames.com/SearchResults.asp?Cat=30 )