The information I have does not say anything about whether the steering wheel is suitable for multiplayer games with two steering wheels. Usually many racing games support multiple controllers, but it depends on the specific game support. You should check the game requirements and the compatibility of the steering wheel with the game to make sure it works.

We are sorry to hear that you are having problems with your device. If you have not found a solution, we recommend that you contact the manufacturer: https://www.ready2music.at/kontakt/ If it turns out that the product is faulty, you can register a warranty claim: https://helpcenter.digitec.ch/hc/de/articles/115005648925-Mein-Produkt-ist-defekt-was-kann-ich-tun

Yes 😊

My son currently only plays Mario Kart ... but I think you can also play other car games like Cars3 - Hot Wheels - WRC8 ...

Yes it works, unfortunately the steering is not quite precise, but the children still have fun.

Yes