[C#] Save/Load Score stays at 0 even when changed

Hello, I don't think anyone is going to be able to help you based on what you provided. If you could please provide your full scripts (including but not limited to: where you call your Save function, and where you call your Load function) We would be able to help you a lot easier.

Is Data class marked as Serializable? The code seems fine.

Also, just to note I'd rather not use PlayerPrefs for score since, as PlayerPrefs suggests, it's not a player's preference. It's a score.

I've looked through your full script and everything seems to be in order, based on that script, I cannot yell you whats wrong. What I'm going to suggest is going in and "Debug.Log" ing it to death and see where its going wrong.

A far fetched reason that isn't working might be that, first time you saved, you created a data file with value of 0 at the field, now every other time you try to save you keep create files with same name but windows, probably mac too, do change the name to hightierdata.dat(1) or something like that,not sure right now/ too bored to check. So when you load you load the initial file the one you created the first ever time you called the function. To check if this is the issue either go to the file folder and delete all existing hightierdata.dat files and try again. If this works let me know to tell you how to fix the code.