OpenCiv1 – open-source rewrite of Civ1
caminanteblanco
120 points
34 comments
March 28, 2026
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Discussion Highlights (15 comments)
tigerlily
> The game logic is Based on original DOS Civilization 1 game version 475.05 disassembly. Love more details on how this was done and the translation to human-readable code.
indy
Since this requires some files from the original Civilization how do people obtain legal copies of the game? It's not available on Steam or GOG (Or am I being hopelessly naïve by asking such a question?)
dvh
Time to pimp up my throne room
1313ed01
> The game is still very popular and easy to play. But the obsoletness of DOS Nothing obsolete about DOS when it comes to playing 2D games. Thanks to DOSBox and other emulators (FreeDOS is also not bad though) it is a fantastic OS (or virtual machine). DOS as a platform for (2D) games has never been better than it is today, on modern hardware running DOSBox.
mmastrac
This is a cool project, but the author should note that they _are_ likely creating a derivative version of Civ1 here. It might look somewhat different, but that's clearly just 16-bit (?) intel opcodes in a slightly spicier form. It's very unlikely this sort of approach will end up with a copyright-free codebase, though it might be useful as a source for a cleanroom approach. The author shouldn't be discouraged -- lots of other recompilation efforts work this was as well, but it's a muddy place to be.
haolez
Can anyone give some hints on what made Civ 1 special compared to other classic entries in the franchise? Despite the nostalgia factor, of course.
yitchelle
While not exactly the same, there is also https://www.freeciv.org/
wiseowise
Looks like C# completely taken over gamedev.
loganhood
There are also some folks working on a similar project for Civilization 2. https://github.com/axx0/Civ2-clone
leptoniscool
Is there a similar project for Masters of Orion?
danielparsons
I love how obsessed HN is with civilization. I put over 1000 hours into Civ 5 alone and was proud to beat diety (and then consistently beat diety). It's funny how many founders are big on civ. Zuck and Elon both apparently spent a lot of time during college on the series.
ixv0
"OpenCiv1 uses .NET 8 and Avalonia UI framework" So.... way bigger filesize than the original game + dosbox running on a html server? Nice exercise though, but I'll stick to the original. By the way CivNet (civ1 + networking for Win 3.11) runs perfectly in Wine
Tarks
Is there anything similar for Civ IV? So many top tier mods break after a while due to the same memory issues.
polski-g
We got civ 2, civ 3, and civ 1. But when will we get the greatest civ ever, civ 4?
BirAdam
This is a great idea. I do play Civ1 on my XT class machine (NEC V20 @ 10MHz, 1MB RAM, 64MB IDE, 256K Trident VGA, NE2000, Adlib) but the turn times are horrendous as this is a 1991 game being run on a 1982 CPU. Realistically, most people would have been playing on either a 286 or 386. Having the game available on modern hardware, I imagine it’d be far more enjoyable. I’ll give it a go.