If you’re looking for a legitimate source of free ROMs, then MAMEDev has a selection of ROMs that are compatible with RetroPie.

For example, if you wanted to relive all those afternoons you spent playing Tetris as a child, then you could search for “Tetris ROM RetroPie.” If you have a specific game or genre of game in mind, then it’s always worth performing a quick Google search to see whether this game is available as a free RetroPie ROM. If you suspect a website may not be completely legitimate, then it’s always best to err on the side of caution and find another source, or you could perform an Internet search to see whether any other RetroPie users have posted about their experiences with this particular website. Some websites breach copyright by offering proprietary games as free downloads, while others bundle their ROMs with malicious software. There are plenty of free games you can download from online ROM repositories, but you should always make sure you download your games from a reputable source.

RetroPie games are distributed as ROMs, which you’ll need to download on a game-by-game basis.

However, you may have noticed there’s one thing missing – it doesn’t come with any games! Where can I download RetroPie ROMs? Once you’ve completed this setup, RetroPie will be ready to use.

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