How to adjust game specific buttons on batocera

A quick tutorial on how to set game specific buttons on batocera.
Example: if you are playing on an arcade and are limited to only 6 buttons, you most likely will not have one of the yellow n64 buttons or “z” button mapped. This will enable you to do so for a specific game or even an entire console.
Be sure to save game remap file (game specific) or save core remap file (entire console) before exiting.
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[@richardcahill3406]

Thanks - hopefully I can set the gear shift on Outrun using an arcade setup. Currently can only drive SLLLOOOOOWWW in low gear

[@ryancook1608]

Thanks! I just got a batocera retropie system today. Was playing original Mario with ps2 controller, nes B was ps2 X and nes A was ps2 O, which felt very unattural. My fingers want to use ■ as B and X as A on nes

[@fearlesscaper]

Wont let me map anything . keeps saying already taken lol . then i cant get out of the game lol