Below is an article outlining the facts regarding ETS2 on handheld devices and realistic alternatives you can actually play. The Truth About Euro Truck Simulator 2 on PSP
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If you have a PS4 or PS5 and a PlayStation Vita, you can stream ETS2 to your Vita via Remote Play. It isn't a native ISO file running on the device, but it allows you to play the full console/PC version from your couch or bed. Below is an article outlining the facts regarding