I'm trying to make a platform runner, but I'm a little confused with making it so the Level Select saves the amount of levels that I've completed and haven't completed. Anyone have any suggestions?
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You can use the System -> Save & Load features to save and load the states of the game. I usually control stuff like that via global variables so you have to replace events that 'Reset global variables' to resetting just the ones you need. Might be an easier/better way but this is how I do it.
you can see the code of the game I created, it has a simple save level using LocalStorage.
you can play the game and see if it is that what you want, then you can download the capx.
https://www.scirra.com/arcade/tutorial- ... game-10855