Free Diplomacy Games on Steam
Steam currently has 508 Diplomacy games available to download and play. Explore our list of the best free games ranked by popularity and ratings. Data for this list is calculated from reviews and player counts reported directly by Steam and will be updated in real-time. Free Diplomacy game rankings were last updated on 5/14/2025.
Looking for more? Explore other lists such as:
- Best diplomacy games on Steam
- Best diplomacy Steam Deck games
- Best diplomacy Steam games for Mac OS
- Best diplomacy Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Crusader Kings II
Explore one of the defining periods in world history in an experience crafted by the masters of Grand Strategy.
Crusader Kings II holds the #1 spot for "best free Diplomacy game on Steam" with a Player Score of 89. Its score was calculated by analyzing a total of 72,483 reviews on Steam. This breaks down to a total of 65,650 positive reviews and 6,833 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Crusader Kings II on the Steam Deck (though some functionality may be limited).
| Release Date | 2/14/2012 |
| Franchise | Crusader Kings Official |
| Developer | Paradox Development Studio |
| Publisher | Paradox Interactive |
| Steam App Id | 203770 |
2. SUPREMACY: WORLD WAR 3
This Long Term Strategy Game lets you take control of the armed forces of your nation. Become responsible for its military expansion, technological research and economic development. Form alliances and wage total war for global dominance on the battlefields of World War 3.
SUPREMACY: WORLD WAR 3 has achieved a Player Score of 75, placing it in the #2 spot for the best free Diplomacy games. Its score was calculated by analyzing a total of 5,303 reviews on Steam. This breaks down to a total of 4,061 positive reviews and 1,242 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, it is not possible to play or run SUPREMACY: WORLD WAR 3 on the Steam Deck.
| Release Date | 3/15/2018 |
| Developer | Dorado Games |
| Publisher | Dorado Games |
| Steam App Id | 784950 |
3. Royal Quest Online
Fantasy comes alive in this vast yet cozy free-to-play MMORPG! Choose between 4 classes and 8 subclasses, explore hundreds of locations, thousands of quests, dive into varied PvE and PvP modes, enter the unique vibrant world, and trade with other players. Play, explore, fight and be victorious!
Royal Quest Online has achieved a Player Score of 79, placing it in the #3 spot for the best free Diplomacy games. Its score was calculated by analyzing a total of 3,736 reviews on Steam. This breaks down to a total of 3,035 positive reviews and 701 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Royal Quest Online on the Steam Deck (though some functionality may be limited).
| Release Date | 12/19/2024 |
| Developers | |
| Publishers | |
| Steam App Id | 2962300 |
4. Supremacy: Call of War 1942
Take over the control of one of the mighty nations during the times of World War 2 in this persisting long-term strategy game. Conquer provinces, forge alliances and build up your economy in real-time. Research top secret weapons of World War 2 and become the one true superpower!
Supremacy: Call of War 1942 has achieved a Player Score of 70, placing it in the #4 spot for the best free Diplomacy games. Its score was calculated by analyzing a total of 5,871 reviews on Steam. This breaks down to a total of 4,200 positive reviews and 1,671 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, it is possible to play Supremacy: Call of War 1942 on the Steam Deck (though some functionality may be limited).
| Release Date | 10/21/2017 |
| Developer | Bytro Labs GmbH |
| Publisher | Bytro Labs GmbH |
| Steam App Id | 672680 |
5. Supremacy: 1914
Take over the control of one of the mighty nations during the times of World War 1 in the biggest WW1 strategy game of all time. Conquer provinces, forge alliances and build up your economy in real-time on persistent maps. Build experimental weapons of World War 1 and become the one true superpower!
Supremacy: 1914 has achieved a Player Score of 73, placing it in the #5 spot for the best free Diplomacy games. Its score was calculated by analyzing a total of 3,919 reviews on Steam. This breaks down to a total of 2,922 positive reviews and 997 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, it is not possible to play or run Supremacy: 1914 on the Steam Deck.
| Release Date | 7/16/2019 |
| Developer | Bytro Labs GmbH |
| Publisher | Bytro Labs GmbH |
| Steam App Id | 979920 |
6. Project Entropy
Welcome, commander, to Project Entropy- an ultimate Sci-Fi and role-playing game with battles in space. In this immersive MMO experience, you will command alien civilizations, conquer uncharted planets, and build Hero fleets.
Project Entropy has achieved a Player Score of 53, placing it in the #6 spot for the best free Diplomacy games. Its score was calculated by analyzing a total of 139 reviews on Steam. This breaks down to a total of 74 positive reviews and 65 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Project Entropy on the Steam Deck.
| Release Date | 4/17/2024 |
| Developer | FunPlus International AG |
| Publisher | FunPlus International AG |
| Steam App Id | 2806410 |
7. Idle Research
Idle Research is an addictive, resource management, incremental game with both idle and active playstyles. Research and craft colorful Flasks and Tubes to earn as much Energy as possible! Big numbers guaranteed.
Idle Research has achieved a Player Score of 81, placing it in the #7 spot for the best free Diplomacy games. Its score was calculated by analyzing a total of 1,707 reviews on Steam. This breaks down to a total of 1,447 positive reviews and 260 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Idle Research on the Steam Deck (though some functionality may be limited).
| Release Date | 8/1/2022 |
| Developer | Considera Games LLC |
| Publisher | Considera Core LLC |
| Steam App Id | 1482860 |
8. Shipping Manager
Create and manage your own shipping empire. Control every aspect from route creation to marketing to staff handling and beat other managers to top the leaderboards.
Shipping Manager has achieved a Player Score of 47, placing it in the #8 spot for the best free Diplomacy games. Its score was calculated by analyzing a total of 446 reviews on Steam. This breaks down to a total of 208 positive reviews and 238 negative reviews — making it "Mixed" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, it is possible to play Shipping Manager on the Steam Deck (though some functionality may be limited).
| Release Date | 9/18/2023 |
| Developer | Trophy Games |
| Publisher | Trophy Games |
| Steam App Id | 2445660 |
9. X3: Farnham's Legacy
X3: Farnham's Legacy is a new game in the X3 space game series. TRADE, FIGHT, BUILD, THINK in a living and breathing universe, which incorporates a new storyline and yet more additions to the open, free-form gameplay that forms the core of all X series games.
X3: Farnham's Legacy has achieved a Player Score of 82, placing it in the #9 spot for the best free Diplomacy games. Its score was calculated by analyzing a total of 602 reviews on Steam. This breaks down to a total of 523 positive reviews and 79 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
10. The Last Sovereign
The Last Sovereign is an adult fantasy RPG that twists your expectations for adult games, while fully embracing a reconstruction of some familiar old tropes to provide a lot of fun, sexy content.
The Last Sovereign has achieved a Player Score of 89, placing it in the #10 spot for the best free Diplomacy games. Its score was calculated by analyzing a total of 721 reviews on Steam. This breaks down to a total of 686 positive reviews and 35 negative reviews — making it "Overwhelmingly Positive" on Steam.
It can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 2/15/2019 |
| Developer | Sierra Lee |
| Publisher | Sierra Lee |
| Steam App Id | 951830 |
More Free Diplomacy Games
Explore even more rankings for the 51 best free Diplomacy games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 1,100 | 2/14/2012 | 89 | Free | Steam Charts | |
| 671 | 3/15/2018 | 75 | Free | Steam Charts | |
| 530 | 12/19/2024 | 79 | Free | Steam Charts | |
| 222 | 10/21/2017 | 70 | Free | Steam Charts | |
| 208 | 7/16/2019 | 73 | Free | Steam Charts | |
| 155 | 4/17/2024 | 53 | Free | Steam Charts | |
| 84 | 8/1/2022 | 81 | Free | Steam Charts | |
| 75 | 9/18/2023 | 47 | Free | Steam Charts | |
| 31 | 5/4/2021 | 82 | Free | Steam Charts | |
| 25 | 2/15/2019 | 89 | Free | Steam Charts | |
 | 13 | 6/12/2020 | 64 | Free | Steam Charts | |
 | 11 | 4/4/2024 | 60 | Free | Steam Charts | |
 | 9 | 12/9/2015 | 64 | $9.99 | Steam Charts | |
 | 7 | 1/11/2017 | 64 | Free | Steam Charts | |
 | 3 | 7/19/2022 | 78 | Free | Steam Charts | |
 | 3 | 1/10/2024 | 73 | Free | Steam Charts | |
 | 2 | 1/14/2025 | 80 | Free | Steam Charts | |
 | 2 | 2/24/2023 | 52 | Free | Steam Charts | |
 | 2 | 10/6/2023 | 79 | Free | Steam Charts | |
 | 1 | 12/1/2020 | 92 | Free | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Player counts and rankings are enriched, analyzed, and updated in real-time to ensure we surface the most up-to-date insights. Learn more about the Steambase approach to data collection and our review methodology.
- Valve Corporation. (2025, May 14). Steam Store. Steam Store.
- Valve Corporation. (2025, May 14). Crusader Kings II on Steam. Steam Store.
- Valve Corporation. (2025, June 4). SUPREMACY: WORLD WAR 3 on Steam. Steam Store.
- Valve Corporation. (2025, June 25). Royal Quest Online on Steam. Steam Store.
- Valve Corporation. (2025, May 14). Supremacy: Call of War 1942 on Steam. Steam Store.
- Valve Corporation. (2025, May 14). Supremacy: 1914 on Steam. Steam Store.
- Valve Corporation. (2025, June 19). Project Entropy on Steam. Steam Store.
- Valve Corporation. (2025, May 14). Idle Research on Steam. Steam Store.
- Valve Corporation. (2025, June 15). Shipping Manager on Steam. Steam Store.
- Valve Corporation. (2025, March 13). X3: Farnham's Legacy on Steam. Steam Store.
- Valve Corporation. (2025, June 16). The Last Sovereign on Steam. Steam Store.