Hundred Days 20 contains 2 complete Napoleonic wargames: Tolentino 20 and Waterloo 20 (third edition).

Tolentino 20 focuses on the battle that took place on May 2nd and 3rd, 1815, in central Italy during the "Hundred Days" campaign. One player commands the Neapolitan army under King Joachim Murat, while the other leads the Austrian forces commanded by Field Marshal Baron Friedrich von Bianchi.

Waterloo 20 (third edition) is a game based on the Waterloo campaign from June 15th to 18th, 1815. One player leads Napoleon's troops, and the other commands Wellington's Anglo-Allied and Blücher's Prussian forces.

The game is in English.