Added new difficulty settings (Easy, Medium, Hard).
Any old save file will be set to medium by default, this is the same difficulty that the game was before.
Any new save files will let you select a difficulty, once again if you like the difficulty as is, select medium.
New save files added so you can play around with the new difficulty settings if you're out of files.
In the future, auto save will be moved from save slot 5 to save slot 10. (your old auto save will still be in file 5).