Three Co-Op Games Free on Steam Until September 1

Steam has three co-operative games that are free to play until September 1. They include Space Engineers, Unrailed 2: Back on Track, and SWORN. From reviews, these games have "Very Positive" user reviews which is widely acknowledged across scoreboards. Space Engineers, Unrailed 2, and SWORN are usually about $60 USD as a total. 
 

Three Co-Op Games Free on Steam Until September 1
By Jacob Miller   |   Aug 29, 2025
Furthermore, at least that is what they are selling for right now; players are getting the opportunity to try them out for free in each instance.

What's in them
SWORN is a four-player action roguelike with procedural maps and has a distinctive graphic signature based on Hellboy creator Mike Mignola. Space Engineers is a massive sandbox space game that allows for up to 16 players to interact, explore, build or survive against eachother in space.

Unrailed 2: Back on Track allows for cooperative train-building across a shifting cuts of maps, with an option for competitive team-modes.

More Freebies and Discounted Games
Steam also made one more game, Nightingale, free to play this weekend. It has "Mixed" reviews, but offers some combination of survival and crafting and online co-op. Forts is also currently free and it has "Very Positive" reviews. There is Darkest Dungeon 2, which is a popular single-player dungeon crawler.

Many of the games we talked about today are discounted from 30% to 75%. Space Engineers is about $5 USD, while Unrailed 2 is $14 USD instead of $20.

Unrailed 2 and SWORN are still in early access, but SWORN will be fully released September 25. We expect Unrailed 2 will be in version 1.0 soon, following nearly a year in early access.
 
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