Legend of Grimrock’s free toolset enters public beta testing today. Almost Human will release the dungeon editor as a free update to the RPG, so modders can build their own dungeon crawling challenges and adventures. The update will include an “intuitive graphical interface, instant in-editor preview, comprehensive modding capabilities,” and built-in Steam Workshop support. A new trailer featuring the Dungeon Editor is below. To participate in the beta you need to have a Steam account and the game installed on Steam. Instructions and more information is available on the Legend of Grimrock website.