Hi, I run Metal Slug 6 for MVS, a Metal Slug 3 bootleg. I requested it 2 times, the first rejected the game because I have to request as part of the serie, and the sencond time rejected the game because is not an oficial game and cannot be part of the serie. What can I do?

Try contacting the mods for the metal slug series and ask them if you can get the games added.

Other than that, https://www.speedrun.com/Metal_Slug_6 lists arcade as an option and https://www.speedrun.com/yue_nan_zhan_yi_3_metal_slug_3 MS3 bootleg is right here.

@Komrade That series only adds official games, not bootlegs. This bootleg is based off the official Metal Slug 3 for Neo-Geo, in this case it does not seem at all necessary to add it to their series (Course you can always ask a series mod regardless but we won't forcefully add it in this circumstance). The submission also doesn't give much information about the bootleg in question which has been recently requested and hopefully it can be addressed as we requested, I did dig around for more information on it but struggled with finding out much on it myself and seemed nearly the same as the original game.