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Not srure what you mean by the ARpiCADE folder is empty (do you mean the whole second partition is empty?  but then it wouldn't even boot...), but it doesn't sound right.

The config file is saved in /home/pi/.local/share/DonutDodoArcade/  but you shouldn't need to copy it (and it can't be written manually).

Only the game files need to be in /boot/firmware/DonutDodo/gamedata/

Try running it from the command line with:
/boot/firmware/DonutDodo/gamedata/./DonutDodo.pi

Boot/firmware is empty. No files/folders at all.

On the Pi or in Windows?

The boot partition is mounted as /boot/firmware/ when running on the Pi. 

When viewing it from Windows (or other OSs) it will not be mounted like that.  The partition is labeled as boot but will be mounted where ever the OS is set up to mount removable disks.

If it's booting and you can run the game from the menu it's not the issue anyway.  If it runs from the menu you have all the required files.  Not sure why it isn't running from the terminal for you.

On the Pi or in Windows?

The boot partition is mounted as /boot/firmware/ when running on the Pi. 

When viewing it from Windows (or other OSs) it will not be mounted like that.  The partition is labeled as boot but will be mounted where ever the OS is set up to mount removable disks.

If it's booting and you can run the game from the menu it's not the issue anyway.  If it runs from the menu you have all the required files.  Not sure why it isn't running from the terminal for you.

when I insert the sd into my pc and then mount the partition and go to the boot folder then firmware folder its empty. Everything works, games load, even donut dodo. just whats mentioned is empty. so im sure thats why when i type the command at terminal (in cab) its saying it cant find anything. Thats why Im wondering if I should just copy over the entire donut dodo folder over from the other partition.

That is normal.  With the SD card plugged into your PC /boot/firmware/ (on the second partition) should be empty.  It is where the first partition is mounted on the running Pi.

Don't copy any files into there.

It's still not working. I hit f4 until at prompt. Verified several times my typing/spelling and still get error saying not found

Can you take a photo of the command you used and the message you get back and upload it?  Maybe I will notice something.

If it's running from the menu it should be there, the location is the same as used by the launcher acript and Attract-Mode.

see pics

see pics

FINALLY figured it out.
At terminal: cd /boot/firmware/DonutDodo/gamedata THEN once at that prompt I typed ./DonutDodo.pi

Game launched and was able to fix controls.

Yeah, looks like it was 2 commands combined.

The 'cd' command is for navigating folders (DOS and Windows have very similar 'cd' commands).

Glad you got it figured out.