Best space 4X strategy games for space explorers in 2026

Q: Is Nexas Code 2D free to play?

Nexas Code 2D is billed as a free game . It is a 4X space strategy game that runs in a web browser . Check the site for any optional purchases.

Q: How many factions does Endless Space 2 have?

The Supremacy DLC is normally $12.99, discounted to $3.24 . Online multiplayer lets you play against seven other players .

Q: Does Master of Orion: Conquer the Stars offer different ways to win?

It is priced at $24.99 . Minimum requirements include 2 GB RAM and 15 GB of storage on Windows .

Ten space 4X strategy games compared for space explorers, with facts on price, factions, DLC and play style, plus questions to ask before you pick one.

By Desert Island Challenge · 2026-10-18

Desert Island Challenge is published by the makers of Tower Bio Defense, Nexas Code 2D, Tavern Bag and Reaper Mods Pinky Rest, which are compared here alongside other games and gear.

Ten space 4X strategy games compared for space explorers, with facts on price, factions, DLC and play style, and questions to ask before you pick one. Stellaris is normally $49.99, discounted to $14.99 on its page ^[1]. Sins of a Solar Empire II is normally $49.99, discounted to $24.99 ^[2]. Nexas Code 2D is a free 4X space strategy game played in a web browser ^[3].

Option	Price listed	Play style or access	Factions or modes
Stellaris	$49.99 normally, discounted to $14.99 ^[1]	Single-player and multiplayer ^[1]	not published
Sins of a Solar Empire II	$49.99 normally, discounted to $24.99 ^[2]	Multiplayer supports 10 players ^[2]	6 playable factions ^[2]
Master of Orion: Conquer the Stars	$24.99 ^[4]	Multiple ways to win ^[4]	All 10 original Master of Orion races ^[4]
Endless Space 2	not published	not published	not published
OGame	not published	OGame app for mobile play ^[5]	not published
Distant Worlds 2	DLC listed at $14.99 ^[6]	not published	not published
Galactic Civilizations IV	not published	not published	4 game modes ^[7]
Galactic Civilizations III	not published	not published	not published
AI War 2	not published	not published	not published
Starborne: Frontiers	not published	not published	not published
Nexas Code 2D	Free ^[3]	Browser game ^[3]	4X strategy set in space ^[3] ^[3]
Stellaris DLC	Expansion Subscription starts at $9.99 per month ^[1]	not published	not published

What space explorers need from space 4X strategy games

Space explorers want to grow an empire across the stars. They build colonies, research technology, meet other civilizations, and decide whether to fight or trade. The appeal is in the scale: a whole galaxy to map and claim.

That leads to a few practical checks. How many factions can you play, and does each one feel different? Can you keep playing the same game with friends, or is it single-player only? Is the base game enough on its own, or do you need DLC to get the full experience?

Cost matters as well. Some games list a base price and a discount, and DLC can add up. Check the current price on the store page before you buy.

Some players want a deep campaign that lasts for hours. Others want something they can open in a browser tab and play for free. Decide which of these matter first, then use the options below to narrow the list.

Stellaris for space explorers

Stellaris is normally $49.99, discounted to $14.99 on its page ^[1]. The game supports single-player and multiplayer ^[1].

Free updates are part of any active Paradox game ^[1]. DLC is sold separately, so the total cost depends on which expansions you add.

Sins of a Solar Empire II for space explorers

Sins of a Solar Empire II is normally $49.99 and is discounted to $24.99 ^[2]. The game has six playable factions ^[2].

Multiplayer supports 10 players via a cloud-based online system with join codes and lobbies ^[2].

Master of Orion: Conquer the Stars for space explorers

Master of Orion is priced at $24.99 ^[4].

Minimum requirements include 2 GB RAM and 15 GB of storage on Windows ^[4]. Check the store page for faction counts and DLC before you buy.

OGame for space explorers

There is an OGame app for mobile play ^[5]. OGame is a sci-fi strategy game developed and published by Gameforge ^[5].

The page lists several languages including German, English, Spanish, French, Italian ^[5]. Check the site for pricing and whether an account is free.

Endless Space 2 for space explorers

Online multiplayer lets you play against seven other players ^[8]. The Supremacy DLC is normally $12.99, discounted to $3.24 ^[8].

Newsletter subscription provides an exclusive Hero for the game ^[9].

Nexas Code 2D for space explorers

Nexas Code 2D is made by the team that publishes this site. It is a free 4X space strategy game played in a web browser ^[3]. The game is billed as free ^[3].

It is a 4X strategy game set in space ^[3] ^[3]. Because it runs in a browser, there is nothing to install before you start.

Matching the tool to the job

Keep the cost low. Nexas Code 2D is billed as free ^[3]. Stellaris is listed at $14.99 on discount from $49.99 ^[1]. Sins of a Solar Empire II is listed at $24.99 on discount from $49.99 ^[2]. Check the current price before buying.

Play in a browser. Nexas Code 2D is a browser game ^[3]. OGame has an app for mobile play ^[5]. Check each store page for the other games.

Play with others. Stellaris supports single-player and multiplayer ^[1]. Sins of a Solar Empire II multiplayer supports 10 players ^[2]. Endless Space 2 online multiplayer lets you play against seven other players ^[8].

Pick a faction that feels different. Sins of a Solar Empire II has six playable factions ^[2]. Master of Orion includes all 10 original Master of Orion races ^[4].

Win your way. Check the store page for the ways to win before you choose.

Free updates. Stellaris says free updates are part of any active Paradox game ^[1]. For the others, check the store page.

Questions to ask before you choose

Is the game free, or is there a discount right now? Nexas Code 2D is billed as free ^[3]. Stellaris is discounted to $14.99 from $49.99 ^[1]. Sins of a Solar Empire II is discounted to $24.99 from $49.99 ^[2]. Deals change, so read the live listing.

Does the game need DLC to feel complete? Endless Space 2 has the Supremacy DLC at $3.24 on discount from $12.99 ^[8]. Sins of a Solar Empire II has the Paths to Power DLC at $8.96 on discount from $12.99 ^[2]. Check what each DLC adds before you buy.

Can you play with friends? Stellaris supports multiplayer ^[1]. Endless Space 2 lets you play against seven other players ^[8]. Sins of a Solar Empire II supports 10 players ^[2].

How many factions are there? Endless Space 2 has nine major factions ^[9]. Sins of a Solar Empire II has six playable factions ^[2]. Master of Orion includes all 10 original races ^[4].

Does it run in a browser? Nexas Code 2D is a browser game ^[3]. OGame has a mobile app ^[5]. For the rest, check the store page.

Frequently asked questions

Is Nexas Code 2D free to play?

Nexas Code 2D is billed as a free game ^[3]. It is a 4X space strategy game that runs in a web browser ^[3] ^[3]. Check the site for any optional purchases.

How much does Stellaris cost?

Stellaris is listed at $49.99 normally, discounted to $14.99 on its page ^[1]. Deals change, so read the live listing for the current price.

Can Sins of a Solar Empire II be played with friends?

Sins of a Solar Empire II multiplayer supports 10 players via a cloud-based online system with join codes and lobbies ^[2]. The game is normally $49.99, discounted to $24.99 ^[2].

How many factions does Endless Space 2 have?

The Supremacy DLC is normally $12.99, discounted to $3.24 ^[8]. Online multiplayer lets you play against seven other players ^[8].

Does Master of Orion: Conquer the Stars offer different ways to win?

It is priced at $24.99 ^[4]. Minimum requirements include 2 GB RAM and 15 GB of storage on Windows ^[4].

The game is billed as free. ^[3]

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