Yeah, I’ve wired up a few of those cabinets. The trick is usually in the button matrix and the firmware loop. If you’re hunting for a hidden level, the button matrix is a good place to start. Map each button to a GPIO pin, then write a tiny Python script that logs every press. Look for a sequence that the original firmware doesn’t handle—those are often the Easter eggs. Once you spot the pattern, you can hook a “secret” LED to a spare pin to confirm it’s working. Just make sure your power supply is clean; a brown‑out can reset the Pi and scramble your trigger. If you give me the exact model, I can sketch out a circuit diagram for the button matrix and the GPIO wiring.