This guide was made to help players who get stuck on a particular level. I sectioned it off into 8 chapters, corresponding to the chapters in the game. The guide assumes you're still stuck after using the in-game hint.
Every chapter from chapter 2 onward will have two sections - first one contains additional hints and presents the correct position of one additional item on the board (so two items in total - one from the in-game hint and one more). The aim here is to provide a little nudge in the right direction for those who don't want to skip the entire level right away.
The second section will contain solutions. There can be more than one solution to a level, but the one in this guide will always be based on the in-game hint.

The game is very easy to 100% since you get most of the achievements from completing it. The ones you might miss can be done after you finish the game.

Non-story achievements:
Missed... - put one object on another until you get it.

Don't hold it in! - You can turn on Click mode in settings

Boooomerang! - Hold an item and rotate it with right-click 500 times.

Is it relaxing?? - You can press the hint button once on every level.

It won't fit! - Make sure you put at least one item on the board every time, otherwise the click won't count!

Perfection! - finish all the levels (don't skip any)