RPG Maker (there's actually four versions) is a program used to create RPGs easily. It uses 2D sprites and a simple scripting program to create everything in it. Some aspects (such as menu layout and battle systems) are hardcoded, but that's to make things as streamlined as possible. Besides, if you get creative enough, you can make a fun system out of your own using what's there.

It's a good way to run through and see if you really have what it takes to do game design.