Without a great game library, superior file formats mean nothing. These timeless classics, spanning multiple genres, are essential for any retro enthusiast:

The most reliable way to get high-quality CHD ROMs is to convert verified BIN/CUE dumps (like those from the Redump project) using the chdman tool.

If you already have a library of BIN/CUE files, you don't need to re-download your games. You can easily convert them into top-tier CHD files yourself using a free, official tool called (CHD Manager), which comes bundled with MAME. Step-by-Step Conversion Guide: