Firstly, identify all the variables you're going to have to save and load (So you're basically saving an actor's state)
in the presented demo, the player can only move left and right and change color, so the variables I'll need to store are x, y and r. (Position and Color)
Create new variables that should hold the saved state of these, and make sure to associate a savegroup name that's the same for each.
Group the variables that should be together with an array if you want; here, I grouped x and y inside SaveCo[2] and made another one for r, SaveRed.
Now for the event that will save these variables into a file. It can be whatever you want, the press of a key, a timer, or whatever event.
Simply assign the values your save variable should hold. in this exemple I used
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SaveCo[0]=x;
SaveCo[1]=y;
SaveRed=r;
and then save these variables with the saveVars function, in this case:
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saveVars("SavedGame.gdt","SaveMe");
Now for the event that will load these variables from a file. Again, it can be anything.
Simply use the loadVars function, in this case:
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loadVars("SavedGame.gdt","SaveMe");
then assign the actor's variable to the save vars, in this exemple:
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x=SaveCo[0];
y=SaveCo[1];
r=SaveRed;
and that's it!
Note: you can also load vars saved from one game to another, different game! simply make sure both variables are the same, with the same savegroup.
you can view the demo's code for further explanation, since I commented on the load/save scripts
