I got the Steam version yesterday and it works on my Win7/64 system. At least, the demo does. Haven't dl'd the full program yet.

Note that the game didn't work the first time I ran it. Got a weird error message but when I tried again it ran without a hitch.

----------- update ----------
the ful version works fine.

I have not tried this on Windows 7 64-bit yet, but my guess is it will work. You may need to run the game as administrator though.

I don't know how to do that through Steam, but it's probably possible.

It should be working on windows 7 64bit.
steam and non steam versions

at first the game might not run, due to it needing an older version of physx installed. the game was crashing on me because I had only the newer version installed.

http://www.nvidia.com/object/physx-9.12.1031-legacy-driver.html

physx link on english nvidia.com is dead :P

but this is working:
http://la.nvidia.com/object/physx-9.12.1031-legacy-driver-la.html

I can confirm that the Original Shadowgrounds runs fine on Win 7 64bit.

Shadowgrounds Survivor is the one that needs the Nvidia PhysX Legacy System Software download.


Since the previous posted link is for our Spanish speaking gaming neighbors, here is the link for the English speaking of those among us.

http://www.nvidia.com/object/physx-9.12.1031-legacy-driver.html

Again, this should only needed for Shadowgrounds Survivor, not the Original Shadowgrounds... hope that helps.