I'm currently working on making a game where the servers need to be replicated on pods inside the Minikube cluster (I'm using Minikube since it's just a school project). However, I cannot seem to figure out how to make these game servers accessible from other networks. I have tried making a NodePort service, that points to the deployment of my server image, and when using the Minikube cluster IP + my service's port I can connect fine.
What would be the best approach to solve this issue?
There isn't really a good way to do this. Minikube is for local development. If you want to run an actual local Kubernetes, start a local VM directly and use something like kubeadm and kubespray.
By default, the Pod is only accessible by its internal IP address within the Kubernetes cluster. To make the your container accessible from outside the Kubernetes virtual network, you have to expose the Pod as a Kubernetes Service in this example as a type LoadBalancer.
On cloud providers that support load balancers, an external IP address would be provisioned to access the Service. On Minikube, the LoadBalancer type makes the Service accessible through the minikube service command.
Minikube is great for local setups but not for real clusters. It spins up only a one-node cluster for development and testing. It is useless if you want to use multiple servers environment.
Taking under consideration that you want to play fast with scalability across the nodes it is useful to create Kubernetes cluster - using Kubespray or Kubeadm. If you want to run an actual local Kubernetes, use a local VM and then create K8s cluster using these tools for automated deployment.
Kubeadm
The kubeadm tool is good if you are new in cloud technologies -run k8s cluster for the first time. You can install and use kubeadm on various machines: your laptop, a set of cloud servers and more. Whether you’re deploying into the cloud or on-premises, you can integrate kubeadm into provisioning systems such as Ansible or Terraform. Kubeadm provides domain Knowledge of Kubernetes clusters' life cycle management, including self-hosted layouts, dynamic discovery services and so on.
Kubespray
Kubespray supports deployments on AWS, Google Compute Engine, Microsoft Azure, OpenStack, and bare metal. It enables deployment of Kubernetes highly available clusters. It supports a variety of Linux distributions and CI. Kubespray supports kubeadm.