PookaMustard: I was able to find that another game is DRM-free.
Pirates of Black Cove Gold The game was downloaded through a Windows XP virtual machine containing Steam, and ran on the host machine running Windows 10 without Steam installed fine. I was able to take control of the ship, sail a bit, and shoot the two ships that appeared with cannons.
EDIT: In addition, I found out that
Woodle Tree Adventures is also DRM-free from Steam using the same procedure as outline above. It even has the soundtrack in MP3 form, ready to use by your favorite music player!
Who knew that when I download this game that I wouldn't even have to try and figure out which files to remove to get it running without Steam? I really remember it asking for Steam back then.
EDIT 2: Just got word that
Transistor runs DRM-free on Linux via Steam.
SUBSEQUENT EDITS: *Verified
Space Channel 5 Part 2 through Steam and ran it on my host machine; works dandy. What I remember however, is that it will RUN Steam if it exists, but will not bother if it doesn't and play anyway. Downloaded through a XP VM and played through a Windows 10 host machine up to the main menu.
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Robowars which is given away by IndieGala is also DRM-free, same Windows and virtual machine method
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Barrier X is also DRM-free, Windows+virtual machine
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Crazy Taxi is the same case as Space Channel 5.
*RPG Maker games, depending on their nature, can be replaced with generic RPG Maker executables and run safely and without Steam. For instance,
Memories of a Vagabond can be made DRM-free by finding a generic RGSS executable,
such as the one I provide here. In order to do that, you must go to your game's directory and enter the properties of the executable and read the description. If it says "RGSS Player," you can replace it with the
exec I linked above. If it says "RGSS2 Player," you should replace it with
this executable, and if it says "RGSS3 Player," you should replace it with
this executable. The games might run and might not run, so you should report those that do work that way.
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Pixel Puzzles Japan. Windows + virtual machine test.
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Red Faction can be made DRM-free through the
official patch provided here. Simply copy and paste the downloaded file to your Red Faction directory. I couldn't get Pure Faction to run on Windows 10 though.
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Super Sanctum TD. Windows + virtual machine test.
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SEGA Bass Fishing, same as Crazy Taxi and Space Channel 5.
I've tried to get Pirates of Black Cove to run on a win 7 machine with the steam.exe file removed and it fails every time with the message SteamAPI_Inti() failed left in the log file. Any ideas what is going wrong?
Edit: I have tried it with no DLC and with DLC, get the same result each time.