The Journeyman Project 3 is over far too quickly. I finished the game in about 16 hours of game play. On the other hand, the plot is always interesting, and everything hangs together well. The Puzzles None of the puzzles in Journeyman Project 3 is in the unfair category. All of them make logical sense, and indeed, most of the time you'll have a darned good idea of what you need to accomplish.
Most puzzles are of the variety of using an inventory item in the right way.
These all make sense. There are also a few where you need to manipulate items. That's all I'll say, I don't want to give it away. The game is extremely forgiving of mistakes. You can't ever get stuck so that you can't go on.