The disc with 3 dots should be turned all the way anti-clockwise to unlock the movement of the 1st disc.
Each small knob determines the position of the gear knob with the same pattern. Use the scheme beside the marble track. Remember small knobs should always be set so that the marble runs freely.
Check where a small knob points (up, down, left or right) and match this direction to the shape on the scheme. Then turn the gear knob with the same pattern so that it points to this shape. In the example below the small knob points up, which stands for “square”. So the gear knob with