Naturally, there’s also a smorgasbord of mechanical tweaks and fiddles to choose from, adding new systems for AI, textures, music and more. On top of the base game’s famously deep and complex set of systems and interactions, its open-ended sandbox version of World War Two has proven extremely fertile ground for modders to create alternate histories, ultra-detailed scenarios covering later (or earlier) conflicts, and even transport you to other game worlds entirely. Still, let’s ride this tiger of selection, and focus on four salient categories to encircle some of the best mods out there. Of all the Paradox titles to deploy massive mods libraries, none might compare with the whopping collection of over 20,000 Hearts of Iron 4 Mods.