Reveal the clues below only as a last resort.
See the code you are entering below or at this link.
What you see it not always what it means.
The meaning (yellow or grey) of each button is linked to their position (left or right) and not to their actual colors (yellow or grey). The color of the buttons are randomly swapped after every click. Hence, to choose which button to click, you need to consider the position of the buttons not their colors.
The meaning (yellow or grey) of a button can be associated with its position, rather than the color displayed on it.