Who it is for
Anyone who wants a one-off sudoku grid during a chat rather than a dedicated puzzle app.
Overview
789 Sudoku, from Spheric Admin Ltd, puts a sudoku grid into a ChatGPT conversation. A game starts from a simple request to play, and the difficulty can be named in the same sentence, for example by asking for an easy puzzle.
The listing is short and does not mention timers, hints, saved games, or a puzzle archive, so what it describes is a single grid produced on request and solved in the chat. Anyone expecting the record keeping of a dedicated sudoku app will find the described feature set narrower than that.
Anyone who wants a one-off sudoku grid during a chat rather than a dedicated puzzle app.
Difficulty is set by the wording of the request, so no menu or settings screen is involved.
Availability
789 Sudoku is listed in the ChatGPT apps directory only. Spheric Admin Ltd has no connector under the same domain in the Claude directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.
ChatGPT apps are built on MCP, and the same server can back a Claude connector, so the absence is a distribution decision rather than a technical one.
ChatGPT listing
Same company
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Brain training drills run inside ChatGPT
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Recipe lookup rendered as a widget in chat
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Builds and reorders lists inside a ChatGPT conversation
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Nearby
Checkers matches played through chat with coaching
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Chess play with move suggestions and feedback
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Instrumental music generated and played in chat
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Battleships played against an AI opponent in chat
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Chess play, multiplayer lobby, and engine analysis
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Play a chess game against ChatGPT
ChatGPT
This is an independent catalogue entry compiled by Node8 from 789 Sudoku's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with Spheric Admin Ltd, and inclusion here is not an endorsement.
Node8 builds MCP servers end to end: deciding which tools are worth exposing, the authentication and permission model, the review submissions, and the onboarding that gets them used. One server serves ChatGPT, Claude, and Microsoft Copilot.