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+--- Thread: Protecting your save files (/showthread.php?tid=2139)
Protecting your save files - VinnyVideo - 10-24-2019
https://www.yoyogames.com/blog/537/protect-your-savefiles
This YYG blog post does a good job explaining some steps you can take to make it harder for players to modify save files generated by your games.
This probably isn't necessary if you're making a simple platformer where all you're saving is the number of levels completed, but hack-proofing your save files can definitely be an issue if you're making more complex games (for example, if you're making online high scores or a game with MMO elements).