Europa Universalis IV

The game has been formed to begin historically, with real events occurring in real time. The game itself is an interactive map of Earth divided into the provinces that compose nations. Each of these provinces contribute to their country either positively or negatively, as provinces can both provide resources to a nation and serve as a point of unrest and rebellion. The gameplay requires the player to lead a nation by finding a balance of military, diplomacy and economy. The player does so through their choices as sovereign of their nation, and through the spending of resources available to them: Prestige, Stability, Gold (Ducats), Manpower, Legitimacy for Monarchies, Republican Tradition for Republics, Devotion for Theocracies, Horde Unity for Hordes and Monarch Power (Administrative, Diplomatic, Military).

Players can choose to conquer the world by military might, become a colonial superpower, establish trade dominance, etc. as one of over 500 different nations. These nations range alphabetically from Aachen to Zuni.[4] The game is a sandbox environment, and while there is no strict rule on winning the game, a loss occurs when the player's nation is removed, or annexed, from the map. Diplomacy is a large aspect of the game, as creating alliances, (or vassal states and tributaries), improving opinions, and preventing defensive coalitions are vital to a player's survival. Espionage can also be employed against enemy states in order to claim their territory, or incite rebellion in their provinces, along with other dubious ends. Combat can be waged on both land and sea, during which the game attempts to simulate real world factors such as morale, discipline, varying unit types with associated strengths and weaknesses, competency of leaders, terrain and supply lines. Trade is also an important part of the game, where the world is divided into many trade nodes and trade flows through each of the nodes and can be collected by merchants.

Many major religions, such as Catholic, Protestant, Sunni, Buddhist, and Orthodox are present in the game and can provide distinct bonuses to their practitioners. Players can employ missionaries to convert their provinces or can engage in policies of universal religious freedom. For example, the Catholic faith makes use of the Papacy, which can allow a nation to have control over the Pope or to use their influence for other rewards.

Technological advancements are invested in over time, and require the expense of monarch points. They provide benefits to the nation as detailed below.

• Administrative technology unlocks advancements such as increased productivity, new forms of government, new buildings, and the national idea system.
• Diplomatic technology unlocks advancements such as naval units, improvements in trade, new buildings, and improved colonial expansion.
• Military technology unlocks advancements such as new types of land units, improved unit morale, combat tactics, and new buildings.

Gameplay is influenced by random events that arise every so often for the player. These events can be either helpful or harmful. Some of these random events are driven by an individual country's history, while some can apply to any country and serve generally to enhance the "flavor" of the game. Players can choose to play single player mode versus the AI, or multiplayer over a LAN or the Internet against a mix of human and AI opponents. Single player also has the option of "Ironman" mode, which locks several settings such as difficulty, and removes the control of saving the game from the player. This means that any mistakes are irreversible. It is, however, the only way to receive any of the game's many achievements.

Early design discussions for Europa Universalis 4 began shortly after the December 2010 release of Divine Wind, the final DLC for Europa Universalis 3 with development, based on the Clausewitz Engine, beginning in earnest in about September 2011.[5] It was first announced to the public in August 2012, to coincide with a showing at that year's Gamescom,[6] after having been teased under the codename of "Project Truman".[7]

Throughout the game's development, Paradox Development Studio released weekly "developer diaries" via their online forums, in which they detailed some feature of the game's development.[8] These included information about design philosophy, game mechanics that were being implemented, and features from Europa Universalis 3 that were being removed.

During its development, Europa Universalis IV had a greater priority given to stability and quality control than had previous games in the series. There had previously been a perception that Paradox's games were not worth buying until several updates or expansions had fixed stability issues. Studio CEO, Fred Wester described this perception as being like "a slap in the face", motivating them to improve.[9] Another of Paradox's major goals was to retain the depth and complexity of their earlier grand strategy games, while making them easier for a player to interact with.[10]

Prior to release, a preview version of the game was showcased through let's plays and via a multiplayer event for journalists.[11] A playable demo of the game was released on Steam on 9 August 2013 with the game itself being released on 13 August.[10]

Following its release, development of the game has continued under the same model that Paradox had previously used successfully for Crusader Kings 2, with paid DLCs being released alongside, and helping to fund, additional free patches which add more features to the base game.[12] As of June 2020, sixteen expansions have been released for the game alongside many minor DLCs offering additional graphical or musical options.[13]

A number of downloadable content (DLC) have been released for the game.

All DLCs are optional and may be applied to the base game in any combination. The largest DLCs come in the form of expansions, which significantly alter the mechanics and features of the game. There are also flavor packs (which add new events and minor mechanics, usually specific to one nation), music packs (which add more backing music) and cosmetic packs (which affect unit models, portraits, and the map). There are also three e-books which have no impact on the game itself, but coincided with the release of expansions.

Expansions are often accompanied by coinciding free patches to the game, which may adjust existing mechanics or add new ones in the theme of the expansion.

Name	Free Update	Release date	Full Expansion	Description
Conquest of Paradise	1.4	11 January 2014		Conquest of Paradise focuses on the New World. It adds an expansion to the mechanics of tribal nations, most prominently Native American ones. It also adds a random new world generator which randomizes the landscape of North and South America. The accompanying 1.4 patch also added colonial regions, protectorates and new starting nations as well as many other small additions and fixes.[14]
Wealth of Nations	1.6	29 May 2014		Wealth of Nations, named after the book by Adam Smith, includes new mechanics for trade and merchant republics. The most prominent additions also include trade companies, privateering, and construction of the Suez, Panama, and Kiel canals. The accompanying 1.6 patch included a new rival system, policies, and extra ship designs.[15]
Res Publica	1.7	16 July 2014		Res Publica, translated as 'public affair' in Latin, is the root of the word republic. It focuses on governance and trade. New mechanics pertaining to elections are introduced, along with election events for the Dutch republics and a national focus. The Republican Dictatorship form of government is also included. The accompanying 1.7 patch included extra idea groups and Merchant Republic factions.[16]
Art of War	1.8	30 October 2014		Art of War, named after the book by Sun Tzu, focuses on military mechanics. It expands on the Thirty Years' War and the Napoleonic era, improves diplomacy (especially surrounding conflict and peace treaties), expands vassal mechanics and adds new options for waging war. The accompanying 1.8 patch amongst other things overhauled rebel mechanics, the trade node setup, and AI and gameplay improvements. Over 900 provinces were added, primarily in regions which previously lacked detail, such as Asia and Africa.[17]
El Dorado	1.10	26 February 2015		El Dorado, named after the mythical El Dorado, improves largely on the nations of Central and South America. This includes Nahuatl, Inti and Mayan religions, a "doom counter" for the Central American tribes, improved mechanics and added events. Exploration and colonisation of these areas is also expanded upon - for example, the Treaty of Tordesillas is added and conquistadors can explore into terra incognita to search for the Seven Cities of Gold. A custom nation designer is included. The accompanying 1.11 patch included new events for South and Central America, improved terrain and general improvements to gameplay.[18]
Common Sense	1.12	9 June 2015		Common Sense, named after the famous pamphlet written by Thomas Paine, focuses on diplomacy, religion and internal development. New religious gameplay is added, focusing on Protestants, Buddhists, and Theocracies. Parliaments are added, with a special parliamentary government granted to England. The accompanying 1.12 patch included 5 new Asian religions, improvements to the peace system, and a reworking of the fort and looting systems. The number of building slots were also decreased, but the existing ones made more powerful.[19]
The Cossacks	1.14	1 December 2015		The Cossacks, named after the Cossacks of Eastern Europe and the Eurasian Steppe, adds the new "Estate" system, mechanics for the Tengri faith, and new horde government mechanics. Other additions include new diplomatic actions such as threaten war and study technology, as well as the victory card system. The accompanying 1.14 patch added many UI improvements and another reworking of the mercenary system.[20]
Mare Nostrum	1.16	5 April 2016		Mare Nostrum, translated as "Our Sea" in Latin, was the Roman name for the Mediterranean Sea. As its name suggests, this expansion introduces new content connected to naval warfare, trade and espionage. Now one can put ships on a naval blockade mission or on a hunting naval mission. One can also create trade leagues, offer Condottieri to other countries to fight and a new timeline feature where one can at any point through the campaign click it and watch how the world has evolved throughout the game. The accompanying 1.16 patch included a major reworking of espionage, several new map modes, new systems for states and territories, and corruption, as well as various new provinces in Ireland and Africa.[21]
Rights of Man	1.18 "Prussia"	11 October 2016		Rights of Man comes from the 1791 book by Thomas Paine of the same name. It includes a new Great Powers system where the eight most highly developed nations are listed as "Great Powers" and have access to new diplomatic abilities. Also includes new governments for Prussia and the Ottoman Empire, new mechanics for revolutionary republics, ruler personalities and leader traits. The accompanying 1.18 patch introduces "Institutions" and an accompanying reworking of technology.[22]
Mandate of Heaven	1.20 "Ming"	6 April 2017		Mandate of Heaven, named after the Ancient Chinese political concept, focuses on improving the East Asian region with the "Empire of China" mechanic, new meritocracy mechanics, the ability of Manchu tribes to raise banners, and a new Japanese Shogunate system. Also included are the "Ages" mechanic that focus gameplay on distinct historical periods The accompanying 1.20 patch includes the "Ages" but with none of the in game mechanics, the new absolutism system, and province devastation.[23]
Third Rome	1.22 "Russia"	14 June 2017		Third Rome refers to idea that Muscovy (and later Russia) are the successors to the Byzantine Empire, thus making them the Third Roman Empire. This immersion pack adds new mechanics for the Tsardom government, the Orthodox religion, and a new Siberian frontier idea. The accompanying 1.22 patch added flavor and new government types for Russian countries.[24]
Cradle of Civilization	1.23 "Persia"	6 November 2017		Cradle of Civilization takes its name from the idea that the Nile River Valley is home to one of the ancient Cradles of Civilization. The expansion includes Trading Policies, Army Professionalism and drilling, Muslim Schools, and the Mamluk government. The accompanying 1.23 patch adds 80 provinces in the Near East region and five new trade goods.[25]
Rule Britannia	1.25 "England"	20 March 2018		Rule Britannia is named after Thomas Arne's book Rule, Britannia!. This immersion pack adds the Anglican religion, missions for British countries, and naval doctrines. The accompanying 1.25 patch includes map changes to the British Isles and France, and a brand new mission system.[26]
Dharma	1.26 "Mughals"	6 September 2018		Dharma is named after the concept present in many Indian religions such as Hinduism, Buddhism, and Sikhism. It introduces government reform mechanics, a reworked policy system, and many new missions and flavor for Indian countries. The accompanying 1.26 patch adds estates to the base game, an overhauled South Asian map, and a new policies system.[27]
Golden Century	1.28 "Spain"	11 December 2018		Golden Century takes its name from the Golden Century of Spain. This immersion pack focuses on mission trees and flavor for countries in Iberia and Maghreb regions, as well as added colonization mechanics and Pirate governments. The accompanying 1.28 patch adds national ideas and events for many Iberian and North African countries.[28]
Emperor	1.30 "Austria"	9 June 2020		Emperor featured many large-scale reworks to the Holy Roman Empire (new reforms and imperial incidents), Revolutions (centers of revolutions), and Catholicism (the Council of Trent and new papal abilities). The accompanying 1.30 patch includes extensive map changes across Europe, the new industrialization institution, reworked estates and mercenaries systems, and extensive flavor events and mission trees for many different countries.[29]

In May 2014, Paradox released a book, Europa Universalis IV: What If? the Anthology of Alternate History, a collection of short stories inspired by the game and its time period, including one by Harry Turtledove The book was released as an ebook, as DLC for the game, and as a physical edition (ISBN 978-9187687440).

In May 2018, at their PDXCon convention, Paradox announced that board games were being developed based upon four of their franchises, stating that they were on a "mission to expand the IP."[43] The Europa Universalis game is being designed by Eivind Vetlesen of Aegir Games, with Jonathan Bolding of PC Gamer describing a preview version as "something between a high player count Twilight Imperium and A Game of Thrones with a dash of Napoleon in Europe".[44]

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