Excerpt: "If you purchase Legend of Grimrock on GOG, or at least visit the game page was promoting Extras for the game. So you might be wondering what the benefits are to buying it on Steam. The only advantage Steam has at the moment is Steam Achievements (if you want them). The advantage GOG has is, as it always is – no DRM. So while digging into my Steam directory, I discovered most of the GOG extras are included with your Steam version – it is just not explicitly told to you."