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The 10 Most Complex Board Games
(gamerant.com)
Everything boardgames
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Are you sure you are not mistaking Dune for Dune: Imperium? Dune is indeed a far more complex game than Dune:Imperium.
I've played both. They're extremely different beasts, but at least to me Dune was less 'heavy' and more 'lengthy' due to negotiations. Might just be that I need to get more plays in, but I don't see the strategy complexity yet