Thank you for taking the time to look into my game.
The paper reference's original purpose was to help inexperienced players complete their puzzle, as it can be pretty hard for new players, especially on mobile devices. Now, it's primarily a part of the game's aesthetics.
Yes, I have noticed it can be a little hard to see in some places with the paper reference. I'm considering adding a mode without the paper in the new updates.
Actually, the intention is to create photo-realistic graphics and to make the game playable smoothly on both mobile and desktop browsers. Therefore, a single image is being used as a single jigsaw game, like the ones available on the web. Perhaps, I will make a collection jigsaw for Windows someday.
Thank you so much!