Go Back Button Script

I've create a game menu, a pause menu and an instruction screen and on the instruction screen I have an an arrow that 'goes back,' however at the moment the arrow has a script that has 'Application: loadlevel' setting in it and it loads back to the main menu only.

I need a script so that when I click the arrow it goes back to the previous 'setting' instead of it loading the menu; when I press pause, instructions then the arrow button, I want it to go back to the pause screen.

Thanks

To implement a "Back"-button you need to introduce some kind of record of where you've just been in the GUI. Unity's GUI system invites the creation of state machine-GUIs where one state might correspond to, say, one window being displayed. So to swap between windows, you have to keep track of the previous states.

Try something like this:

string menuPosition = "MainMenu";
string previousPosition = "";

void OnGUI()
    {
            switch (menuPosition)
            {
                case "MainMenu":
                    DrawMainMenuScreen();
                    break;
                case "Settings":
                    previousPosition = "MainMenu";
                    DrawSettingsScreen();
                    break;
                case "Load Game":
                    previousPosition = "MainMenu";
                    DrawLoadDialog();
                    break;
                .etc
                .etc
                .etc
                default: 
                    break;
            }
    }

Then in lower windows, like the SettingsScreen(), if your Back-Button is clicked you set menuPosition = previousPosition to cause the next call to OnGUI to draw whatever came before. Keep in mind that the above is extremely simplified - First off, the menuPosition probably shouldn't be a string, but an enum. Secondly, the states should probably enter and leave a Stack datastructure to automate the retrieval of the previousPosition, instead of setting it manually every time.

The key is to introduce state memory. Keep track of where you are and just have been in the GUI.