Custom PC was created in 2003.
The easiest way to learn is to start with the basics and build your knowledge step by step. Learn what each part does—CPU, GPU, RAM, motherboard, storage, power supply, and cooling—and how they work together. You can watch beginner-friendly PC-building videos, read component guides, and use PC part-picker tools to practice creating builds without buying anything. Once you understand compatibility, try building a simple PC yourself. Take your time, follow a good guide, and don’t force any component into place.
Since Custom Robo Arena can be played on DS you can most likely get an emulator for your PC and play it. Hope it helped :)
Custom Builder was created in 1991.
Villy Custom was created in 2008.
The Custom of the Country was created in 1913.
Custom Machine was created in 1963.
The Custom of the Army was created in 2010.
Custom Coaches was created in 1955.
It is impossible on the Xbox but it can be used through maps in Halo Custom Edition(on PC). Halo Custom Edition is a freeware but it requires Halo PC which is not free.
Sadly, no.
Without hacking, I don't think you can. Halo Custom Edition is only PC
Custom Killing was created in 1987-07.