How do you complete level 84 on 100 Floors?

Answer 1

Press all 3 buttons at the same time with 3 fingers. Press the middle button. Press the 2 blue buttons at the same time with 2 fingers. Then press all 3 buttons at the same time with 3 fingers. See related link for screenshot.
First touch the red button to hear the sound. That is the sound of a correct action.

Touch a blue button to her the sound. That is the sound of a wrong action.

Then tap all three buttons (2 blue and 1 red to make purple triangle)

Then tap the red button (to make red line)

Then tap both blue buttons (to make blue plus sign)

Then tap all three buttons again.

If during any of these actions you hear the wrong sound you have to start from the top.
Press all 3 buttons at the same time with 3 fingers. Press the middle button. Press the 2 blue buttons at the same time with 2 fingers. Then press all 3 buttons at the same time with 3 fingers. You have to listen for the sounds each time you press the buttons. It should make a chime. If done correctly the door will open. Be patient as it might take a few tries. See related link below for screenshots.
Press all 3 buttons at the same time with 3 fingers. Press the middle button. Press the 2 blue buttons at the same time with 2 fingers. Then press all 3 buttons at the same time with 3 fingers. You have to listen for the sounds each time you press the buttons. It should make a chime. If done correctly the door will open. Be patient as it might take a few tries. See related link for screenshots.
Press:

All 3 buttons at same time.

Red button.

Two blue buttons at same time.

All 3 buttons at same time.

(3,1,2,3)