Duels
Deadreckoning
Four ships hide on an eight-by-eight grid, placed and sealed before your first shot; call cells, read the hits and misses, and sink them in as few shots as you can.
- Players
- 1
- Length
- 20–30 min
- Rated
- All ages
- Version
- 1.2.0
- Updated
Works with ChatGPT · Claude. Free, no signup.
Opens ChatGPT or Claude with the play prompt ready; press send if it hasn't started. Same link on your phone as on your desktop. Another app? Copy the play prompt into it. This game needs a chat that can open links: its answers stay in a sealed file on this site. What works where.
Want it as an installed app, or the card itself?
The game card is every rule of the game, about 9k characters, but not its answers: those stay in a sealed file on this site, so even pasted, Deadreckoning needs a chat that can open a link. Pasting the answers in yourself would spoil it. The Skill installs Deadreckoning into Claude on any plan: download it, then turn on code execution under Settings → Capabilities and add it at Customize → Skills → + → Upload a skill.
Deadreckoning is 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. Solo, 20–30 min a run, free to play inside ChatGPT or Claude. No signup and nothing to install: open it in your assistant, or paste the play prompt into any chat that can open links.
How to start
- Open it in your AI. Tap Open in ChatGPT or Open in Claude, and press send, or paste the play prompt into any assistant that can open links. No paid plan required.
- The game loads. The ship positions are sealed under a SHA-256 hash before release, and the AI reads you that hash before your first shot.
- Call your shots. Call a cell such as D4. The AI answers hit, miss or sunk and redraws the grid; the misses show you where the ships cannot be.
- Verify the seal. When the last ship sinks, the AI shows the sealed positions. Then paste the revealed answer into aigamecards.com/verify, which recomputes the hash in your browser.
Questions
- Could the AI just slide a ship out from under my salvo?
- No. The four ships and their ten cells were placed and hashed with SHA-256 before release, and the AI reads you that hash before your first shot. Every hit and miss is called from that fixed layout. When the last ship sinks, paste the revealed layout into aigamecards.com/verify and check that it matches.
- Does the AI fire back?
- No. This is a solo hunt: you fire, and the AI only referees, calling hit, miss or sunk from the sealed layout. There are four ships of two, three, three and two cells, each in a straight line, and no two touch.
- How long does a game take?
- Twenty to thirty minutes. You call one cell at a time, and the game ends when the fourth ship sinks or you give up. Every miss costs a point, so a tidy hunt scores higher.
- Can I play it on my phone?
- Yes. It runs entirely in a chat with ChatGPT, Claude, or Gemini, so any device that opens one of those works. There is no app to install and no account beyond the chat itself.
- Is it suitable for kids?
- Yes, it is rated all ages: a grid, four ships and some deduction, with nothing graphic. Anyone who can read a grid reference such as D4 can play.