6.0
With little challenge and no real need to engage with the game beyond the most basic of mechanics, Principia is all dressed up with no place to go. I had fun with it, to be sure. But I also found myself getting bored frequently, having to take breaks to avoid being ground down by the constant repetition. If you don't mind that the game is fairly simple and have an interest in the topic, you might want to check out Principia. I want to give it a stronger recommendation than that, because the game has a lot of heart. I just wish the quality of its methods matched its passion.
