What is a 4X strategy game? Explore, expand, exploit, exterminate

Hallmarks to look for

• Explore a hidden map to discover land, resources and rivals
• Expand by founding cities, colonies or territories
• Exploit resources through economy, research and production
• Exterminate or otherwise defeat rivals, though diplomacy and other victories exist
• Usually turn-based, with sessions lasting many hours
• Technology trees that unlock new options over time

Where the name comes from

The term “4X” comes from a 1993 preview of Master of Orion in the magazine Computer Gaming World, written by Alan Emrich. He rated the game “XXXX”, explaining the four Xs as “explore, expand, exploit and exterminate”.

The genre’s roots go back further. Sid Meier’s Civilization (1991) is one of the most influential examples, and its series continues today alongside space-based games such as Stellaris and Endless Space.

The four Xs in practice

Each X describes a phase of play, though in a real game they overlap constantly:

• Explore — at the start, most of the map is hidden. You send scouts to find land, resources, ruins and neighbours.
• Expand — you found new cities or colonies to claim territory and grow your output.
• Exploit — you develop your land, build infrastructure, research technology and manage your economy.
• Exterminate — conflict with rivals, through warfare or by outcompeting them.

Despite the last X, many 4X games offer peaceful routes to victory, such as science, culture, diplomacy or economic dominance.

Diplomacy plays a large role in many 4X games. You can trade resources, sign alliances, agree borders or declare war, and computer leaders remember how you have treated them. Some players enjoy playing a peaceful game that ends without a single war, while others prefer military conquest; most 4X games are designed to support both.

How turns work and why “one more turn” is famous

Most 4X games are turn-based. On your turn, you move units, choose what each city produces, pick research and handle diplomacy. When you end your turn, the computer players take theirs, and the world advances.

Each turn is short, but something is always about to finish: a building, a technology, a new city. That creates the famous “one more turn” effect, in which a planned half-hour session becomes several hours. A single full game can take many hours spread over several sessions, and 4X games save easily so you can pick up where you left off.

Some space 4X games, such as Stellaris, use real-time-with-pause instead: time flows continuously, but you can pause at any moment to give orders.

Multiplayer 4X games exist too, usually with simultaneous turns or turn timers to keep things moving. They tend to be long, so friends often play over several evenings.

Technology trees, victory types and difficulty

A technology tree (or research tree) is a chart of discoveries that unlock new buildings, units and abilities. It works much like a skill tree in a role-playing game, but for a whole civilisation. Planning your path through it is a major part of strategy.

4X games usually offer several victory types, letting you pursue different goals. Difficulty settings control how efficient computer rivals are; on higher settings, they often receive extra resources. New players are usually advised to start on a low difficulty and a small map, which keeps games shorter and easier to follow.

Scenario and map settings also make a big difference. Smaller maps with fewer rivals lead to shorter, more focused games, while huge maps with many civilisations create long, sprawling campaigns. Many 4X games also let you pick which victory types are enabled, so you can switch off the ones you do not enjoy.

4X compared with RTS and grand strategy

4X games are often confused with neighbouring genres:

• A real-time strategy game is usually a single match lasting under an hour, focused on base building and battles.
• A 4X game covers a whole civilisation over a long campaign, usually in turns, with economy and research as important as war.
• Grand strategy games are closely related but typically place you in a detailed historical map with an existing state, rather than starting from a single settlement.

The categories blur, and some games mix features from more than one.

If you have enjoyed board games about building and trading, a 4X game is often an easy step into video game strategy, since many of the ideas, such as managing limited resources and planning several moves ahead, are familiar.

4X terms you will meet in your first game

4X games come with their own vocabulary:

• Turn — one round in which every player acts once.
• Tech tree — the chart of research options.
• Snowballing — an early lead that grows into an unstoppable one.
• Wide versus tall — playing with many cities (wide) or a few highly developed ones (tall).
• AI bonuses — extra resources given to computer rivals at higher difficulties.
• Victory condition — the goal that ends the game, such as science, culture or domination.
• Late game — the final stage, when empires are large and turns take longer.

Most 4X games include in-game encyclopaedias that explain these concepts in more detail, which are worth opening during your first campaign.

The in-game advisers found in many 4X games also suggest what to build or research next, which is helpful while these ideas are still new.

4X games for families and new players

4X games are generally well suited to thoughtful older children and adults. Violence is shown at a distance and is not usually graphic, and the starters here are rated PEGI 7 or PEGI 12. History-based games can also prompt an interest in real civilisations, though they simplify history for gameplay.

The main consideration is time: sessions run long and the genre is built around wanting to see the next turn. Agreeing a number of turns or a time limit before starting, and using the save feature, works well. Several 4X games sell large amounts of downloadable expansion content; check what is included before buying, and look for the In-game purchases descriptor on the rating.

Gentle places to start

Age ratings are the PEGI ratings listed for each game; always check the current listing on your platform before buying or downloading.

Game	PEGI	Platforms	Why start here
Sid Meier’s Civilization VII	PEGI 12	PC, PlayStation 4, PlayStation 5, Xbox One, Xbox Series X|S, Nintendo Switch, Nintendo Switch 2	The latest entry in the best-known historical 4X series, splitting a game into distinct eras.
Sid Meier’s Civilization VI	PEGI 12	PC, PlayStation 4, Xbox One, Nintendo Switch	The previous Civilization, with a large amount of expansion content and a long-established community.
Humankind	PEGI 12	PC, PlayStation 4, PlayStation 5, Xbox One, Xbox Series X|S, Nintendo Switch	A historical 4X in which you change culture from era to era, blending traits from different civilisations.
Stellaris	PEGI 7	PC, PlayStation 4, PlayStation 5, Xbox One, Xbox Series X|S	A space 4X with real-time-with-pause play and a strong focus on storytelling events; console versions are listed separately on pegi.info.
Endless Space 2	PEGI 7	PC	A turn-based space 4X with very different factions, each with its own storyline.

Subgenres and offshoots

Questions

Sources we checked

1. en.wikipedia.org/wiki/4X
2. en.wikipedia.org/wiki/Master_of_Orion
3. en.wikipedia.org/wiki/Civilization_(video_game)
4. pegi.info/search-pegi?q=Civilization+VII
5. pegi.info/search-pegi?q=Civilization+VI
6. pegi.info/search-pegi?q=Humankind
7. pegi.info/search-pegi?q=Stellaris
8. pegi.info/search-pegi?q=Endless+Space+2
9. store.steampowered.com/app/392110

Last checked: 2026-11-03