Key Open / Key Tile : Make Door Dissapear While Open

[Obsidian]

I think this was already included in MSE1... the difference was, that when you used the key it made the 'mask' layer disappear. I think what Joke is going for, is if you want to make something other than just Mask disappear (if you've added more layers, or if you want to use Fringe, that kind of thing)