RetroArch core per game

[matchaman]

I would like to make a few games to use a different (more accurate) core. I can't find any option for that so I assume that I need to edit the particular games and use "custom command-line parameters".

What do I need to put there for an alternative core or is there another option to change it per game?

Cheers

[Lordmonkus]

-L "cores\name of core.dll"