In 1999, ' was released, with slightly updated rules and focus on the European theater of World War II; this was followed in 2001 by ' with similar rules and focus shifted to the Pacific theater. ' (2004) focused on the Allied liberation of France. In 2004, the first major revision to the core game, "Axis &amp; Allies: Revised" was released, with elements taken from "A&amp;A: Europe" and "A&amp;A: Pacific", also celebrating the 20th anniversary of Axis &amp; Allies itself. ' (2006) focused on the Battle of the Bulge in Europe while "" (2007) focused on the Solomon Islands Campaign in the Pacific. In 2008, "Axis &amp; Allies: 50th Anniversary Edition" was released as one of the three games celebrating the 50th anniversary of its publisher, Avalon Hill (the other two games were "Acquire" and "Diplomacy"). This was followed by "Axis &amp; Allies: 1942" in 2009, the second major revision to the core game, with mechanics taken from the anniversary edition, also celebrating the 25th anniversary of "Axis &amp; Allies" itself.