First make sure that your character is standing still somewhere in the level and that the camera is not moving. Then press the Esc key and go into 1 player. After that click save and select the file you want to use on the save screen. Enter a name for your file by typing, and then press enter. If you save at the beginning of a level, make sure that the introduction to the level you are in disappears. The reason why I told you to make sure of all of that is because glitches will result if you don't. I know this cuz it happened to me once.
Chat with our AI personalities
You go to the website www.srb2.org and click on downloads. Then you click on one of the mirror links (mirror 1, 2 etc.). After that you click save and pick where to save it to. That is all.
It saves automatically after every fight.
The game automatically saves the furthest act you ever got to. You can save the Tiny Chao Garden.
Sonic the hedghog does not have a save system there fore every time you play you have to start over unless you leave it on over night.
Sonic advance 3 saves automatically after an act or boss. It also saves chaos and chaos emeralds as you collect them.