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Hearts of Iron 4 (HOI4) Update 1.11.4 Patch Notes (Barbarossa ...
Has more than 2 free building slots for Naval dockyard including locked slots.
Stellaris - How to Add Orbital Deposits via Console Commands - ...
Built for Stellaris version 3.8 "Gemini." This add-on is achievement compatible because the maximum number of building slots is controlled by a game configuration setting.