I bought all five books of Into the Unknown in print. It is a great system that really finds a sweet spot between 5e and OSR games. My only issue, aside from some typos, is with the print copy of book 2: Playing the Game. The book opens with a completely unrelated product, an adventure for Thrilling Tales called "Terror in Tinseltown." This adventure takes up more than half of the book and it's the first half of the book about game rules. I would much rather have a slimmed down copy or have the bonus material in the back of the book. It would even be acceptable if the genre wasn't such a contrast to a fantasy RPG. As it is, it's just something that I have to flip past everytime I'm trying to look up a rule.

(Edit 3/31/2021) I received the reprinted book 2 without the strange inclusion. I updated my rating to 5 stars as this is my go to system for introducing 5e players to the OSR. This is criminally underated as a game system and blows Five Torches Deep out of the water.

Here's to hoping the author gets his "Expert" rules finished in the near future. It'll be an autobuy for me.

Although it's the slimmest volume of Into the Unkown, Book 2: Playing the Game brings the fundamentals of old-school play to the fifth edition of the world's oldest role-playing game. By introducing turn based dungeon and wilderness exploration with segments and watches, and modifying short and long rest rules, this volume brings old school functionality to new school mechanics. You've never enjoyed middle school so much!