Desura now offers installation and downloads of a playable demo for Teslagrad, Rain Games' magnetic puzzle/side-scroller adventure that's due for full release this fall. Here's what this is all about: "The demo, available by direct download for Windows, Linux and MAC OSX, allows you to dive into the secrets kept in the Teslagrad Tower. This first public build features the first steps of the adventure, a final boss fight, and perhaps even certain clues about the legendary struggle between the ancient Teslamancers, and the wrath of an embittered king." The Rain Games website has more details on the demo as well as a "super awesome Teslagrad demo speedrun contest," offering a "unique" soundtrack CD as a prize.