2-Player problems

Hello I´am new here so iam not really into it so excuse me if I make some mistakes (same for my english :D). So I just installed this great addon on my raspberry2 and it works pretty good. I tryed some Snes games, all of them run perfectly smooth and multiplayer works also pretty fine. But I got a little problem on my favourite multiplayer game, its super mario bros3… there is an 2 player battle mode, for those who dont know it, its like and old super smash brothers ^^ And here is the problem: I cant choose the battle mode, when I do just an error sound turns on (like there is no second player or something like that)… in every other game 2 player modes work. So I think the game is maybe checking if 2 controllers are plugged in and here is maybe the problem? Is there any setting where i can pretend that 2 controllers are plugged in or isnt this the problem? Ps First player is on keyboard and second on a controller.

I hope i did not so many mistakes :stuck_out_tongue: