Can the PS5 Slim play PS4 games? In short, yes. - PC Guide

Backward compatibility is one of the prime things to consider before a console upgrade, so check out if the PS5 Slim can play PS4 games here.
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Can the PS5 Slim play PS4 games? In short, yes. - PC Guide

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Discover a deeper, highly immersive gaming experience that brings the action to life in the palms of your hands. Chat with friends online using the built-in microphone or by connecting a headset to the 3.5mm jack. Feel physically responsive feedback to your in-game actions with dual actuators which replace traditional rumble motors.