What an amazing tool for both solo play and to help a GM run a low-prep / prep-less game. It seems to interact well with the RPGs I have tried so far, and the explanations are very clear. The only reason it's not a 5/5 for me is the rather cringy art throughout. Doesn't bother me too much, but the book would have been better without it.
[4 of 5 Stars!]