Cores are essentially other programs and games that run through RetroArch. RetroArch requires cores to run any content. Tip Many game console may have multiple emulator cores, the question of which one is the best may come up. Emulators can be designed to be more accurate at the cost of a performance hit, check out the Emulation General Wiki for a good look at what will suit your needs and hardware. Installing cores through RetroArch interface ¶ Tip If you do not see the "Core Downloader" option, you may have installed RetroArch using a package manager. If so, see Installing cores through package manager (Ubuntu PPA only) . Otherwise, to enable it: Navigate to Settings Navigate to User Interface Navigate to Menu Item Visibility Enable Show Core Downloader Navigate to Online Updater Navigate to Select Core Downloader Select the core you want to download Note If you're using the Ubuntu PPA version of RetroArch and have enabled...