[.FuneraL.]

pawn Код:

CMD:world(playerid, params[])
{
     new World;
     if(sscanf(params, "d", World)) return SendClientMessage(playerid, -1, "Usage: /world [ID World]");
     if(World < 1 || World > 99) return SendClientMessage(playerid, -1, "[ERROR]: Worlds 1 - 99");
     SetPlayerVirtualWorld(playerid, World);
     return 1;
}

Try.