Pocket Book Adventures' Cool Combat Mechanic

About Pocket Book Adventures, from BoardGameGeek:

Pocket Book Adventures is a solo-only, minimalist dungeon crawler that's built for travel. Explore dozens of maps, encounter unique monsters, level up, grab loot, and do it all from a book that fits comfortably in your pocket or purse! Best of all, you can play this entire game with nothing but the gamebook and a pencil! Rather than using dice or cards to generate randomness, Pocket Book Adventures introduces a simple, dexterity-based system that balances skill and luck for truly engaging gameplay. With its compact size, minimal components, and built-in ability to save your progress, Pocket Book Adventures is the perfect game for playing on the go!