Thank you! Glad you like our work!

In the puzzle you mention, sometimes with some screen resolutions, one of the bouncing springs in the puzzle could appear almost out of the screen (with some resolutions some elements of the UI move a little out of place). Could be that you could still click it even if you almost not see itw but if you can't check it setting it on full screen and it should fully appear. Beside this the only trik of the minigame, beside learning which path the book should take is that sometimes you have to press the bouncing springs after the book goes through, waiting to be triggered when it returns.

Hope it helps!