This insane thing was very fun to make, but I don't know if anyone will actually attempt it. You have to download the Sketchup model for this one, because you have to be able to rotate the cube and look through the tunnels. I made the sides translucent and color-coded the tunnels to make it more doable. It's tricky, but extremely cool if I say so myself.
Here's an animation of the solution. The music is just something I was humming, which I thought sounded cubish. The yellow dot in the center of the video follows the correct path.