[ An interactive explainer in three floors ]
The Word Machine
How a large language model actually works, one guessing game at a time. Told as a dungeon crawl.
Every impressive thing these models do is one act, repeated: given some text, predict a plausible next word. The chat window, the personality, the tools, the agents: all scaffolding around that trick. The floors go down in that order. Floor 1 is the trick itself. Floor 2 is the plumbing that turns it into a chat. Floor 3 is the harness that turns a chat into an agent, and it's where the vocabulary of current AI development lives.
Start at Floor 1 unless you've been here before. Each floor stands on the one above it.
[ Floor 1 of 3 ]
The monster itself
Words become numbers, a trillion knobs, a fill-in-the-blank school, attention, the loop, and why fabrication is the machine working as designed.
The Cartographer's Table·The Golem·The Sphinx's Riddles·The Scrying Pool·The Endless Stair·The Mimic's Den
[ Floor 2 of 3 ]
Behind the glass
How a question becomes the start of a completion, what inference is, what "thinking" and "effort" actually buy, and how a picture rides the same loop.
The Masquerade·The Forge and the Field·The Wizard's Study·Spell Slots·The Gallery
[ Floor 3 of 3 ]
The harness
Agents, tools and MCP, rules files, subagents, hooks and guardrails, evals, and context engineering, as scaffolding around the one machine.
The Dungeon Master·The Character Sheet·The Spellbook·The Familiars·Wards and Traps·The Map
How to play
Each room is one idea and one toy. The toys are hand-built with made-up numbers; they show the mechanism, not real model output. On a wide screen a map of the floor sits on the left with a marker for where you are; on a phone the same controls are at the bottom. Every room ends with loot, the thing worth carrying out, and a note on where the same idea shows up in the tools you use every day. Each floor ends with an inventory of the words you now own.
The mental model follows John Mount's "A Simplified Mental Model of LLMs"; the teaching style, poke the simulation instead of reading the bullet list, follows Laurentiu Gabriel's "How I Use LLMs to Learn". Floor 3 leans on Anthropic's writing on agents, context engineering, and evals. The dungeon framing owes a debt to every LitRPG that ever announced an achievement in a box.