Like in candy crush or other games when you have completed a level the menu screen is a map which shows you how far you've got how would you be able to do this? If you can help it would be a massive help as im new to all this
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In terms of what? You would have to make some graphics. You can unlock levels based on global variables.
In terms of keeping the information in between plays, you want to look into the local storage object and storing information with that.