Something evil lurks in the depths of the dungeon. No survivors have returned to describe it. Did you ever think about making your own game, and wonder how to proceed? Here you'll build a roguelike game from scratch, step by step, in TypeScript. You'll be involved in the design process and the choices that shape the game. We focus on how to fit together the many parts that make up a game. We discuss the ideas behind our design decisions, their alternatives, and how they will shape the game. Learn about how to build a large piece of software, as you follow its construction in this book. This book is not itself a programming language tutorial, but is great practice to grow your skills as a programmer. You will learn about: Making dungeon maps procedurally Combat - kill ants and get killed by cats Missile spells - melt each other with fireballs Descend to deeper levels by dungeon stairs Magic items, armour and weapons Clever & stupid monster AIs Encounter the final foe Debuff spells - cast debilitating curses on your dungeon brethren