Grimrock

Is there a way to take a screenshot ingame? There's no documentation for it, and fumbling around the row of F-keys yielded nothing. I'd rather not have to resort to going into windowed mode and hitting alt-printscreen. Maybe it's a feature of the developer console? I haven't tried activating that yet.

you can always try screen capture software like bandicam or fraps

if you have it via steam. Steams screen shot system works fine with no tabing or pasting required.

Try switching the game to borderless. It works similar to fullscreen and it will allow you to take screenshots.

Even if you didn't buy through steam you can add it as a non-steam game and still get the overlay + screenshot functions.