// variables //
    string path = @"D:GamesNew folderSongs";  // change to your songs folder
    List<string> thingsToDel = new List<string>();



    // delete duplicate directories //
    string[] allDirs = Directory.GetDirectories(path);
    // the amount of characters (counting from the beginning of the dir name) that have to match before it's counted as a duplicate
    int indexesToCheck = 8;

    for (int i = 0; i < allDirs.Length; i++)
    {
        // makes a substring with 'indexesToCheck' amount of characters from the directory name
        string dirStart = allDirs[i].Substring(path.Length + 2, indexesToCheck);
        // the +2 is because the path allDirs[i] has an additional '//'

        // goes trough every dir above i and compares it to 'dirStart'
        for (int j = i + 1; j < allDirs.Length; j++)
        {
            // makes another substring
            string otherDirStart = allDirs[j].Substring(path.Length + 2, indexesToCheck);
            // if they match, the dir of index i will be deleted later on
            if (dirStart == otherDirStart)
            {
                thingsToDel.Add(allDirs[i]);
                break;
            }
        }
    }

    // deletes everything in 'thingsToDel'
    foreach (string thing in thingsToDel)
    {
        Directory.Delete(thing, true);
        // the true stands for deleting directories, even if they have subdirectories/files
    }
    thingsToDel.Clear();



    // delete files that do not match my needs //
    string[] allFiles = Directory.GetFiles(path, "*.osu", SearchOption.AllDirectories);
    // .osu files are comparable to .ini files

    // if true, the file will not be deleted
    bool fileIsCorrect = false;
    // if true, the file has mania as mode and needs an aditional check
    bool modeIsMania = false;

    // checks for each file, if it should be deleted
    foreach (string file in allFiles)
    {
        fileIsCorrect = false;
        modeIsMania = false;
        string[] lines = File.ReadAllLines(file);

        foreach (string line in lines)
        {
            // format is: Mode = (number between 0 and 3)
            if (line.Contains("Mode"))
            {
                if (line.Contains("0"))  // change to your gamemode/s (add || line.Contains("x") to add one)
                {
                    fileIsCorrect = true;
                }
                else if (line.Contains("3"))  // delete these 4 rows if you don't want mania maps
                {
                    modeIsMania = true;
                }
            }
            else if (modeIsMania && (line.Contains("CircleSize") && (line.Contains("4") || line.Contains("7") || line.Contains("10"))))
            { // circlesize is an additional check that only mode mania/3 needs
                fileIsCorrect = true;
            }
        }

        if (!fileIsCorrect)
        {
            thingsToDel.Add(file);
        }
    }

    foreach (string thing in thingsToDel)
    {
        File.Delete(thing);
    }
    thingsToDel.Clear();



    // delete directories without .osu files //
    allDirs = Directory.GetDirectories(path);

    foreach (string dir in allDirs)
    {
        // if a dir does not have at least 1 .osu file in it, it will be delete later
        if (Directory.GetFiles(dir, "*.osu").Length == 0)
        {
            thingsToDel.Add(dir);
        }
    }

    foreach (string thing in thingsToDel)
    {
        Directory.Delete(thing, true);
    }
    thingsToDel.Clear();



    // end of program //
    Console.WriteLine(
        "The Program is finished!n" +
        "Press any key to exit...");
    Console.ReadKey();