@barbudreadmon
don't worry about that, thanks

It's been a while since your post, but I wanted to offer some insight. I had the same issue with using cheats in Retroarch MAME, and it took me a while to figure it out. One thing I want to point out is when you’re playing a game, you can enable cheats through the Retroarch menu by setting “Enable cheats” to On. Alternatively, you can enable cheats globally by editing the configuration file to include the line mame_cheats_enable = "enabled".
If you’re into more advanced game hacking, you might want to read this guide on kernel-level injectors. It has a lot of useful information.

Not a video, but there's an older forum posts on how to create a cheat file that you can load into the emulator - see here.
Assuming you're playing the PS1 version of the game, you can add get some GameShark codes from here, the libretro cheats database doesn't seem to have one for the PS1 version.

@mgrabow

Depending on which libretro core you use, when enabling cheats, your setting is probably stored as a core option in /opt/retropie/configs/all/retroarch-core-options.cfg .

Something like this (depending on which core) :

mame_cheats_enable = "enabled"

Try to set your, similar, line on "disabled" to disable the cheats.

According to the libretro docs, yes, that folder should be created. However, the same page says that internal Dolphin cheats are not supported, so that step may be useless.

@dankcushions Yep, that was actually helpful! Thank you!

Here's what I did to make it all work.

Your cheat.7z file has to be in this folder:
/home/pi/RetroPie/BIOS/mame2016/cheat

You can get the cheat file here:
https://github.com/libretro/mame2016-libretro/tree/master/metadata

Load up a game in lr-mame2016 like "Donkey Kong" for example, and then go into options and "Enable Cheats."

Screen Shot 2021-03-02 at 8.00.47 PM.png

You then need to RESTART the game (It does not say restart required in the options, but you have to restart) and then when you load up the game again, press TAB on the keyboard to get to the MAME Menu:

Screen Shot 2021-03-02 at 8.02.10 PM.png

And then you can be just like Billy Mitchell and cheat to your hearts desire! :P
Screen Shot 2021-03-02 at 8.02.43 PM.png

I've tested it in quite a few games as so far so good!

Thanks again for the help!

@dteam

That is just what I was thinking tonight.

Cool, we were on the right track ;-)

Well, still we have to learn allot about MAME, we are not finished yet with learning !

@mortalwombat cheats in fbneo: https://retropie.org.uk/forum/topic/27826/mame-2003-question-regarding-lucky-and-wild/13?_=1612257367323

samples in fbneo: i’ve provided you with the link on how to use them and it specifically refers to donpachi: https://retropie.org.uk/docs/lr-fbneo/#samples. if you’re now talking about mame2003 - we weren’t talking about that romset before! please be specific.

mame2003 sample instructions are available on the mame2003 docs page: https://retropie.org.uk/docs/lr-mame2003/#samples

@barbudreadmon Thanks! I had put the cheats in the wrong folder.

@escc1986 this topic was already posted in 2017, https://github.com/libretro/mame2010-libretro/issues/38

We don't support 3rd party images, especially the ones loaded with ROMs - as are the ones that you're trying to choose from. Use the image from retropie.org.uk/download and follow the installation instructions from the Docs.

If you're hard pressed on time, I recommend you get your brother friend a ready made console, like one of the mini consoles released by Sega/Sony/Nintendo, which come already installed and with the games included.

I'm not sure the download location has changed, I don't see the doc page reference a precise location for each system. The cheats are downloaded from the Libretro buildbot AFAIK, not directly via git, the archive is generated from https://github.com/libretro/libretro-database. Both have been restored after the hack incident a while ago, so it shouldn't be an issue.

@afcalan2307
If this fails then it's the game, or change the emulator, I had this issue with gba Metroid fusion.

cheats = 1 cheat0_desc = "faster leveling" cheat0_code = "12345678+0000" cheat0_enable = "true"