• Europa Universalis: loosely based on the board game of the same name, covering the period 1492–1792
• Europa Universalis II: the sequel to Europa Universalis, expanded to cover the period 1419–1819.
• Europa Universalis III: sequel, covering the period 1453–1789.
• Hearts of Iron: a World War II strategy game dealing with the period of 1936–1948.
• Hearts of Iron II: an expanded sequel to Hearts of Iron.
• Hearts of Iron II: Doomsday: a stand-alone expansion to Hearts of Iron II depicting an alternate history setting of the Cold War and moving the game end to 1953.
• Victoria, An Empire Under the Sun: a game about the Victorian era spanning the period 1836–1920.
• Victoria: Revolutions: An expansion to Victoria that improves gameplay and extends the game's end to 1935. Includes built-in converter to Hearts of Iron II: Doomsday.
• Europa Universalis: Crown of the North: an English language version of the Swedish game Svea Rike 3 — the predecessor to Europa Universalis. The game map features only Scandinavia and the Baltic coast. It follows the struggle for dominance of the area between the various factions. This game was released in North America together with a rerelease of Europa Universalis II at version 1.07, with the addition of new scenarios.
• The Two Thrones: a game which is virtually the same as Crown of the North except it is based during the Hundred Years' War so it has a different map (France, the Low Countries, the British Isles, and the northern fringes of Spain) and a few new units.
• Crusader Kings: a game of Medieval strategy running from 1066–1453. Unlike other Paradox games, the player controls not a country, but a dynasty. Crusader Kings games can be exported into Europa Universalis II, allowing the player to continue his campaigns for 400 more years.
• Diplomacy, released 2005. a new version of the classic Diplomacy boardgame. Paradox's stated aim is to provide a more authentic computer-based Diplomacy experience, with a graphical diplomatic interface and a diplomatic AI that builds on Paradox's previous experience with strategic AIs.