Now this isn't a demo, so don't get too excited, but Legend of Grimrock 2 developer Almost Human has released a for its upcoming dungeon-crawler sequel, letting you check to see if your PC can handle it.
There's no in-game content, the tool will instead "fire up the Grimrock 2 engine and display a 3D scene while the new Grimrock 2 main menu music plays in the background".
Having tested your hardware, the programme then saves a log file to Documents/Almost Human/Grimrock2 Compatibility Test/grimrock.log. If you have any problems you can send this file over to the developers and they'll check to see if they can fix the issue. Before you do so, the studio asks if you can check that you match the minimum specs. If you don't, that's probably the problem.
You can also mess around with the config file to change the graphics settings. If you mess that up, just delete the file and reinstall it. The compatibility tool can be downloaded.
Legends of Grimrock 2 is out on October 15.