There is NO "2013 version" of OS9. You may have a copy that was compiled and/or posted in 2013 and you're confusing that with an original creation date.
Your USB mice didn't work probably because that copy of 9.2.2 had a necessary USB system Extension uninstalled or disabled. Those things can happen when people upload stuff without triple-checking. The person who uploaded it probably had a Mac without USB or something.
A couple of suggestions:
If you have cool USB mice needing jobs, download "USB Overdrive" from Mac Garden. It will let you enable scroll wheels, third buttons etc.
Being totally new to Mac, be aware that:
You're using an "obsolete" G3 AND an "obsolete" operating system. That means your learning curve is going to be steep……really steep. There are NO current update, active help desks, books on the rack at the computer store etc. Your best lifeline for maximum knowledge and minimum confusion is HERE on the Forum. Honestly however, this place, while containing an astonishing amount on useful information, is notoriously difficult to navigate - it IS a user forum / bulletin board kind of place after all and the Search function could be a lot better in a perfect world.
If you're a present or former Windoze user, you'll get very confused for a while - mainly because you'll be expecting and looking for all kinds of things that simply don't exist in the Mac OS or that are built-in where you don't have to deal with them. Disk drivers, enablers etc. and all kinds of little doodads especially.
Others with experience with gaming and "old" video etc. hopefully will chime in here……