How to call a function, the first time game is ran only

Hello, I have a tutorial for my mobile game but need it to run the first time the game is launched only.

How do I go about this?

Only with save data. Add some variable to save object (like bFirstRun = true), and save as false after first run.

and be sure to load the savegame when the game starts and check that variable

Hello, sorry i took a while to reply, got caught up at work.
Don’t really know much about save data but will read up on it and give it a shot.
Thank you so much for your time.