AI Game Cards

Word games for ChatGPT, Claude & Gemini

Updated

Sealed word games — every answer is committed before the first card turns, so the AI can check you, never move it. Free, no signup. Each game is a ready-to-play prompt (we call it a game card) that you open in your own AI assistant.

A word game with an AI works when the target word or definition is fixed and hashed before you play. The assistant scores your guesses against a committed answer rather than deciding after the fact whether what you said was close enough.

New to AI games? Read the best games to play with ChatGPT, Claude & Gemini.

GameWhat it isPlayersLengthAges
The Word-Hoard A sealed word-deduction game: five hidden words, six fixed clues each, and an AI that can only read them out. 1 10–20m All ages
The Counterfeit Lexicon A sealed bluffing word game: seven obscure words, three definitions each, the true one hashed before you play. 1 10–15m All ages
Slow Thaw: Hangman Without the Gallows An AI hangman game for kids: eight words sealed before you guess, and a snowman instead of a gallows. 1+ 20–30m All ages
AGC · 016 ◆ FIRST Word Games The Word-Hoard 1P15mSEAL AGC · 017 Word Games The Counterfeit Lexicon 1P12mSEAL AGC · 032 Word Games Slow Thaw: Hangman Without the Gallows 1P+25mSEAL

Can an AI score a word game fairly?

Word games with an assistant fail in a particular way: it grades generously. A near-miss becomes a hit because it can see what you meant, and a definition you invented is accepted because it sounds plausible. Without a fixed target, the score means nothing.

Every card here commits the answer first. The Word-Hoard seals its target, The Counterfeit Lexicon seals which definition is the true one, and Slow Thaw seals eight hangman words, each hashed before release, and the assistant scores against that file. The bluffing game in particular only works if the real definition was chosen in advance — otherwise the truth is whichever one you did not pick. Hangman needs it most: a 2026 paper proves that an AI working only from the visible conversation cannot keep a word both hidden and fixed, so Slow Thaw's host fetches the sealed words when the game starts, which means the chat has to be able to open a link.

The Counterfeit Lexicon was rebalanced when a cold playthrough won it at roughly 5.7 out of 7 with no vocabulary at all: the true definition was reliably the longest and the only one carrying a secondary-sense qualifier. The tells were removed, the letters redistributed and the salt rotated, because a word game you can beat on formatting is not a word game. A later probe still found the forgeries reading as invented, and the words famous enough to recognise, so the second edition replaced all seven and rewrote every definition in one register; with the words hidden, a model now does no better than chance on the ones it cannot recall. The Word-Hoard's second edition holds each definition back to the fourth clue for the same reason.

Questions about word games

Can the AI cheat at a word game?

Not about the answer. The target word, or which definition is genuine, is written into a sealed file and hashed before the card ships, and you can recompute that hash at /verify/ after the reveal. What an assistant can still do is grade you kindly on a near-miss, which is why every card specifies the scoring rule rather than leaving it to judgement, and Slow Thaw lets you say "check again" to have the host re-check your guessed letters against the sealed file.

How long is a game?

The Word-Hoard and The Counterfeit Lexicon take 10 to 20 minutes for one player; they are the shortest cards in the library and the usual entry point. Slow Thaw takes twenty to thirty minutes for eight words and plays as one team, a child, a family or a class with the teacher typing, and you can save after any move. All three are rated for all ages, and the reveal-and-verify at the end takes seconds.

Do I need a large vocabulary?

It helps but it is not the whole game. The Counterfeit Lexicon is about reading how a definition is written — real lexicography has a particular flatness that invented definitions rarely imitate well — and after the rebalance the formatting tells that made it winnable without vocabulary are gone. The Word-Hoard rewards systematic guessing more than word count.

If you like word games