Maze tutorial help; skybox

I’m working through the maze tutorial at Wikibooks: Blender 3D: Noob to Pro

I’m having trouble when adding the skybox, two specific problems:

  • When I add the skybox it is is opaque, so when I run the game (pressing P), I only see the skybox and not my maze or nosified cone.
  • When I show the skybox, it is situated in layer 2, all shading is gone, when I disable layer 2 (SHIFT+2KEY), shading is fine, but I have no skybox.

Any help would be appreciated.