Click on the corner where the score counter is to show/ hide it. (the game doesn't have an end.) Click on the mobile and non-mobile buttons to select them. The white arrow shows which button is selected. Click on the play button to start the game. Move the arms around to get the apple inside the red circle. When it's inside, drop it. (Trying to drop the apple when it's not inside the circle won't drop it.) Non-mobile controls: Use up and down arrow keys to select the arms. Use right and left arrow keys to turn the arm you're selected on. Press space to drop the apple. Press s to skip. Press m to show and hide volume controls. Mobile controls: Use the up and down buttons on the right to select arms. Use the buttons on the left to turn the arm you're selected on. Press the button labeled "drop" to drop the apple. Press the skip button to skip. Press the button with a music note thing on it to show and hide volume controls. My high score is 174. My strategy: Rotate the lower arm to get somewhere near the circle. Rotate the middle arm so that a circle at its tip, with a radius of the length of the outer arm, overlaps the circle. Then rotate the outer arm to the circle. If it's not close enough, adjust.
Thanks to @cloverfly for the original. The fact that they didn't use the provided apple sprite just bugged me.