I think you have to start the game first, and then switch to offline mode. I've never done that, but you'd probably need to do it through the Steam overlay since the game is running.
“A world is supported by four things: The learning of the wise, the justice of the great, the prayers of the righteous and the valor of the brave. But all of these things are as nothing, without a ruler who knows the art of ruling. Make that the science of your tradition!”
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Reverend Mother Gaius Helen Mohiam, from the novel Dune
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witter
