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. 2020 Jun 19;8(2):179. doi: 10.3390/healthcare8020179
Algorithm 1. The “Guliu Guliu” game performed on the proposed interactive device.
Input:
 (1) a “waiting time” constant Twait;
 (2) three nostalgic songs and their lengths;
 (3) the trailers, the lyrics, and the corresponding music segments of three songs.
Output: graphic pictures and videos shown on the display screen like those listed in Table 3.
Steps.
//Stage 1: initialization ―
Step 1:                        //Theme 1: “Game initialization” (inviting an action)
 ask the user to press the start button to start the game by text and voice messages.
Step 2:                            //Theme 2: “Log in” (inviting an action)
 ask the user to tap his/her ID card on the ID sensing area by text and voice messages.
//Stage 2: inviting the user to select a song ―
Step 3:  //Illustrating how to select a song, inviting the user to do it, and playing the trailer of the selected song
  •  3.1

    teach the user how to select a song by rotating a ball with its color identical to that of the

    desired-song title by displaying a text message and a sample song title;

                                 //Theme 3: “Select a song” (teaching)

  •  3.2

    set the initial time To according to the system timer;

            //To is used for computing the total time used by the user to complete a round of the game

  •  3.3
    perform the following actions within a time duration of Twait seconds:
    •  (a)
      ask the user by text and voice messages to select a song from the input three displayed
      on the screen as taught above in Step 3.1;     //Theme 4: “Select a song” (inviting an action)
    •  (b)
      if the selected song is correct, then //Theme 5: “play the trailer of the selected song” (demonstration)
      •   (i)
        display a message to inform the user the selected song title and play the music
        trailer of the song;
      •   (ii)
        go to Step 4;
      else
       go to Step 3.3 to ask the user to redo the selection;
  •  3.4

    go to Step 1.      //Restarting the game because the user fails to select a song within Twait seconds

//Stage 3: guiding the user to play the selected song one lyric after another ―
Step 4:    //Illustrating how to play the song one lyric after another and inviting the user to do as illustrated
  •  4.1

    teach the user how to play the selected song one lyric after another in the following way via

    text and voice messages as well as a short demonstration video:

                               //Theme 6: “Play a song lyric” (teaching)
    •   (a)
      select a ball with its color identical to that of each lyric displayed on the screen;
    •   (b)
      rotate the ball for at least one circle around the rail;
  •  4.2

    for each lyric of the selected song, do:

                    //Theme 7: “Play all song lyrics” (inviting action and demonstration)
    •   (a)
      display the lyric with its text randomly assigned a color and ask the user to act as
      taught above in Step 4.1;
    •   (b)
      if the user does not select a ball within a time duration of Twait seconds, then go to
         Step 1 to repeat the entire process;
      end if;
    •   (c)
      if the selected ball is correct, then
        if the ball is not rotated for a complete circle yet, then perform the following
          steps repeatedly:
      •      (i)
        display the lyric text with its characters highlighted one by one; and
      •      (ii)
        play its music segment;
          end if;
        else
          go to Step 4.2(a);
       end if;
   end for;
//Stage 4: ending ―
Step 5:                       //Theme 8: Ranking of performances (illustration)
  •  5.1

    set the ending time Te according to the system timer;

  •  5.2

    compute the total game-running time as Ttotal = Te − To, normalize it as Tnormal = Ttotal/Tk where

    Tk is the length of the selected song;

  •  5.3

    rank the user’s performance according to the value of Tnormal based on the criterion: “the

    shorter the normalized game-running time, the higher the rank”;

  •  5.4

    show the ranking result on the screen.

Step 6: while the game is not restarted do:        //Theme 9: Play the selected song (demonstration)
    play the entire melody of the selected song;
                //Playing repeatedly the entire selected song if the start button is not pressed
   end while;
Step 7: go to Step 1.                    //Starting the game from the beginning again
                                       //End of the algorithm