This Extension kit is just that; a kit to extend WITP into late 1945 and 1946 making it possible to explore the possibilities of the war continuing without atomic intervention. The kit includes a new counter sheet for planes, ships, and other units scheduled to appear after August 1945. It also includes an additional set of the aircraft counter sheets for a total of five counter sheets, plus two more tactical island maps. The rules and charts booklet covers the additional rules needed to continue the war.