AI Game Cards

Duels for ChatGPT & Claude

Updated

Short one-player duels with your AI: crack a hidden code or find a hidden fleet, both placed before your first move. 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 duel here is a short one-player game against your AI over something hidden: a code to crack in Aqua Regia, a fleet to find in Deadreckoning. The hidden setup goes into a file before release, along with a published fingerprint of that setup (a SHA-256 hash), so the assistant answers from a layout it was given and cannot move it as you close in.

New to AI games? Start with this guide: The best games to play with ChatGPT, Claude, and Gemini.

GameWhat it isPlayersLengthRated
Deadreckoning A Battleship-style hidden-fleet hunt for one: four ships on an 8×8 grid, positions sealed before you start; the AI calls hit or miss and never fires back. 1 20–30 min All ages
Aqua Regia Mastermind-style code-breaking: find a sealed four-part formula in ten tries from the two counts the AI reads off each trial mix. 1 15–25 min All ages

These games keep their answers in a sealed file on this site, so play them in a chat that can open links, such as ChatGPT or Claude.

Duels № 004 Deadreckoning 1 player20–30 min Duels № 013 Aqua Regia 1 player15–25 min

How can an AI keep a hidden fleet or code from moving?

Any hunt for something hidden rests on one assumption: the thing you are hunting was placed before you started looking. Played casually with an assistant, that assumption is false. Nothing was placed, so the fleet can drift away from your shots and the secret code can become whatever you have not guessed yet, and you would never see it happen.

Aqua Regia and Deadreckoning both seal the hidden setup before release. The assistant scores every guess against that sealed file: each trial batch you mix, each shot you fire onto the grid, is checked against a layout that existed before the chat did. When the game ends you can check the file at /verify/.

Scoring is fixed on the card too. Aqua Regia gives you ten batches to find the formula. Deadreckoning has no shot limit, but each miss costs a point off 100 and giving up scores zero, so no ending pays better than finishing the hunt.

Questions about duels

How do the two duels play?

Aqua Regia hides a formula of four measures drawn from six essences, repeats allowed. You mix a trial batch of four, and the assay tells you how many measures are the right essence in the right place (SET) and how many are a right essence in the wrong place (HAZE). Deadreckoning hides four ships, ten cells in all, on an eight-by-eight sea, with no two ships touching. You call one cell at a time and hear HIT, MISS or SUNK until the last one goes down.

How long does a duel take?

15 to 30 minutes, one player: Aqua Regia runs 15 to 25 and Deadreckoning 20 to 30. Each ends with a score and a reveal you can check in a few seconds. Both are rated for all ages.

Can I replay them?

Yes, but the hidden setup is fixed for each version of the card, so a replay is the same code and the same fleet. That makes a played duel a fair challenge to hand a friend who has not seen it, and no use as a second attempt of your own.

If you like duels