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Leaving EA on the 31 st of August. Get them game now before I change its price to 14.99usd !
Join us on Discord -> https://discord.gg/tavRA6W
Hi I'm Valentin, young French developer of 21 years old. I started this game in December 2019 from scratch after playing my first wargame for a couple of hours.
Working alone on it with my brother who's responsible for the art.
This game features :
  • Over 700 units
  • Customizable units (Rockets, bombs, drop tank, torpedo, trucks, half tracks, horses etc)
  • A rank and experience system for the units, and the player
  • Any country you want to play
  • A unit editor (Create or modify any unit you want)
  • A tile editor (create or modify any tile you want)
  • A country editor (Create any country you want)
  • A map editor allowing you to recreate any battle of your choice (up to 300 x 300 hexes and above if your PC can handle it)
  • A fully functional steam workshop to upload your work to, and download other's
  • An entire Europe map
  • An entire Pacific map
  • An entire Eastern front map
  • A campaign for major countries, with a core-unit system (Keeping units between scenarios)
  • A supply line mechanics (Optional)
  • Blowing up or repairing bridges mechanics
  • Diving / going to surface, and spotting mechanics with submarines
  • Retreat, surrender, capture mechanics
  • A morale mechanics (Optional)
  • A season mechanics + weather mechanics (Optional)
  • No time limit to complete scenarios if you don't want to
  • Daily, or almost updates
  • A complete guide on Steam + official tutorials on youtube
  • A cool developper :))
Operation Citadel isn't just about the eastern front, and even less just about one battle. To be honest, all good names were taken and I could not think of one.
If you have a better idea, I would be happy to hear it, send me an email or drop by our discord !
The game should run just fine on pretty much anything. If not, you'll get a refund, but let me know so I actualize the requirements !
If you have any suggestion, critic to make, send an email or leave a message on the discord, or open a topic in the forum. You will ALWAYS be answered to.
And last but not least, if you like the game and want to support me, leave a positive / constructive review here on Steam, share the game with your friends, knock yourself out !
Operation Citadel
Valentin LievreDeveloper
Valentin LievrePublisher
2020-03-05Release
🎹🖱️ Keyboard + Mouse
Overwhelmingly Positive (704 reviews)
Public Linux Depots:
  • Operation Citadel Depot : Linux [1.65 G]
8.1.0 - BETA

TL;DR: \nA full wipe of the old PBEM server will happen on January 1st, 2026.\nAll data will be erased. You have until then to finish your ongoing games.\nI strongly recommend moving over to 8.1.0 your experience will be much, much better!\n\n------------------------------------------------------------------------------------------------------------\n\nHello everyone!\n\nTodays update is a bit special version 8.1.0 is now live on the beta branch!\n(Right-click the game Properties Betas choose 8.1.0)\n\nWhy beta? Because this update is huge, and I need your help to test it before full release.\nIve tested everything I could now I need YOU to push it further. :)\n\nWhere am I going with this? What could possibly require this much effort? Hehe...\n\n

A BRAND NEW PLAY-BY-EMAIL SERVER!

\nYes, you read that right Ive taken two weeks off to learn a new programming language, a new OS, and Ive rewritten the entire PBEM system from scratch.\n\nWhy the rewrite?\nThe old PBEM server was the only part of the game I didnt fully control it was commissioned years ago and had reached its limits in both flexibility and performance.\n\nNow its fully mine, fully modernized, and ready for the future!\n\nI also took the opportunity to completely overhaul the multiplayer menu UI its cleaner, faster, and offers more possibilities.\n\n

Highlights:

\n
    \n
  • New public user profiles (custom avatar, bio, stats, and more)\n
  • PBEM games now support 2 to any number of players\n
  • Massively improved security (roughly 300% more secure)\n
  • Enhanced performance\n
  • HTTPS protocol no more data corruption issues\n
  • Password protection for both realtime and PBEM games (optional)\n
  • Moved away from AWS servers are now directly reachable from Russia without proxies\n
  • Full developer control over everything (thats me!)\n
\n\n

ADDED

\n
    \n
  • Brand new PBEM server. \n
  • Several new sections in the Manual.\n
  • 7.5 cm le.IG 18 and 7.5 cm Gebirgsgeschutz 36 light artillery to Germany.\n
\n\n

CHANGED

\n
    \n
  • All base game units end use year has been changed from 1946 to 1949.\n
  • Updated all of the realtime multiplayer libraries (we were quite a few versions behind).\n
  • Many sections of the manual have been cleaned up and reorganized.\n
  • Red color on damage breakdown is now brighter for increased readability on dark backgrounds.\n
  • End of turn menu will no longer appear when playing a singleplayer game (when going from one human player to another).\n
  • Foreign equipment is now available in the upgrade menu.\n
  • When upgrading/downgrading a unit to a modified version of itself, it will no longer be sent to the reserve.\n
  • Saving during multiplayer games is now allowed (all).\n
  • Rebalanced Low Countries campaign scenario (Axis side).\n
  • Finnish F2 Buffalo has been renamed into B-239.\n
\n\n

FIXED

\n
    \n
  • Achievement \'Losing a hero\' could not be unlocked.\n
  • Naval units were affected by land units\' ZoC.\n
  • Game was loading Custom Heroes data from one folder and saving it into another, leading to data mismatch. Proper location is: GAME/MODS/YOUR_MOD/Custom Heroes/Custom heroes.txt\n
  • When opening the \'Statistics\' menu before the game\'s end, if you changed the sorting mode, that could re order the whole list of players.\n
  • Move or attack not properly greyed out on units that have the \'move or attack\' property.\n
  • Typo in the Farragut and Allan M Sumner destroyer classes (USA).\n
  • Buildings (units) were showing a non zero upkeep value, even though they had no upkeep value.\n
  • \'Better Scientists\' policy was not excluded from the menu when playing without the \'Research\' setting.\n
  • \'Flexible Strategy\' policy was not giving any refunds on policies you cancelled after loading a save.\n
  • Music player resuming automatically when tabbing out/back in even though you manually paused it.\n
  • Europe \'45 had a missing airfield VP in Poland and 2 wrong road tiles in Iraq.\n
  • AA units could attack enemy planes during bad weather if the tile had an enemy land unit in range.\n
  • In some specific cases, air units could become invisible when an enemy land/naval mine was on the same tile.\n
  • Upgrading a ship to a carrier was not allowing that ship to launch airplanes.\n
  • Fighter planes had their attack SFX overwritten in some cases.\n
  • Landing bonus on damage breakdown was showed as red instead of green for Marines.\n
  • Some units could remain invisible in some specific cases due to the recent \'cleared FOW saving\' feature.\n
  • Several upgrade/downgrade cost issues.\n
  • Minor localization issues.\n
  • Drawings were not refreshed for your allies in real time multiplayer.\n
  • Using supply ships/planes in real time multiplayer was not synced.\n
  • Germany in the scenario North Africa 1942 had negative manpower on turn 1.\n
  • Joining a faction through the diplomacy menu was opening the \'faction creation\' popup window.\n
  • Sometimes, in very specific cases, some unit in the Order of Battle could display a hero name even though they had none.\n
  • FOW on the map was not refreshed in real time multiplayer after a player accepted an alliance proposition.\n
  • Weather was not synced properly in real time multiplayer.\n
  • Upgrades, downgrades, or update actions were not synced properly in real time multiplayer.\n
  • Efficient Modernization policy was applied even when downgrading (money getting in) meaning you\'d lose some money (25%).\n
  • Code freeze due to units no longer existing in the game being used by events (they will now be skipped/removed).\n
  • Localization issue with policy picking confirmation window.\n
\n\n

REMOVED

\n
    \n
  • Access to previous multiplayer server. (You can still use the old version until January 1st, 2026)\n
\n\n

FOR HARMONY MODDERS:

\nPlayer.Nickname (string) has been removed and replaced by Player.UserId (Guid).\nIf your mods use this variable, please update them accordingly.\n\n\n

Reminder:

\nThe current PBEM server will be wiped on January 1st, 2026.\nMake sure to finish your ongoing games before that date!\n\n\nThats it for now I cant wait to see what you think of the new PBEM system! As always, your feedback is invaluable.\n\nThank you for helping make Hex of Steel better every update :)

[ 2025-11-05 15:54:45 CET ] [Original Post]

Minimum Setup

  • OS: Im not sure
  • Processor: i3 or higherMemory: 1500 MB RAM
  • Memory: 1500 MB RAM
  • Graphics: 512Mb
  • Storage: 1700 MB available space

Recommended Setup

  • OS: Im not sure
  • Processor: i3 or higher
  • Graphics: 512Mb
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