Not sure if there are any genuine games for the subject, but HackTheBox (labs and academy) have some very fun challenges that will force you to learn a decent bit about networking along the way. I personally feel I learn the most about networking messing around with a homelab, VMs or GNS3/Packet Tracer. Try and get a DHCP server setup, then connect clients, then subnet, then give it some vulnerabilities and find a reason to sniff traffic with wireshark. Each layer and protocol is its own beast so there's a lot to learn, I find it best to immerse in it all and understand how they interconnect.