Chess
Full legal move validation with bounded tactical search at higher levels.
Seven games · three levels
Your next move, right inside ChatGPT.
Play Chess, Go, Tic-Tac-Toe, Connect Four, Reversi, Mini 8-Ball, and Court Duel on an interactive board. Pick Easy, Medium, or Hard and keep the same saved match going.
The standalone preview is live; the app is not yet publicly listed in ChatGPT. No sign-in, payment, gambling, prizes, or calibrated Elo rating.
Hard mode
Move confirmedD4 landed on the saved board.
One arena.
Plenty to master.
Every board uses an authoritative rules engine. Legal moves, turns, captures, scores, resets, and endings are checked by the server before the interface says they happened.
Go
Quick 9×9, 13×13, or full 19×19 boards with captures and positional superko.
Tic-Tac-Toe
A quick classic with complete minimax play on Hard.
Connect Four
Gravity, tactical threats, and a compact board built for chat-sized screens.
Reversi
Flip bracketed discs, navigate forced passes, and win the mobility battle.
Mini 8-Ball & Court Duel
Two original turn-based sports games with finite, transparent choices.
Fast to play.
Careful with state.
A local, difficulty-aware engine chooses automatic opponent moves in both the ChatGPT widget and standalone preview. The server checks each move and returns the saved board with a confirmation receipt.
Set the match
Choose the game, color, board size where relevant, and Easy, Medium, or Hard before starting.
Tap exact moves
Available intersections, squares, columns, shots, and safeties come from the current authoritative snapshot.
Resume safely
Versioned saved sessions reconcile after reloads. Reset and End Game require a clear confirmation.
Continue a Go board
Attach a Go-board image in ChatGPT, inspect the transcription, then approve the position before either side moves.
Made for the pane
Chess and smaller boards use a landscape-aware layout, while 19×19 Go remains fully visible without forced scrolling.
Receipts, not guesses
Version and reset-epoch checks reject stale actions; ambiguous mutations are never blindly repeated.
Built in public.
Inspect the source, game rules, tests, MCP contracts, and release status on GitHub, or try the live standalone preview above. Stable hosting is live; public ChatGPT availability still requires submission and review.