Multiplayer TicTacToe Game using Flutter, Socket and MongoDB

Set up a node.js back end by creating a server folder, initializing npm, and installing express, mongoose, and socket.io for real-time MongoDB multiplayer gameplay.

Initialize an Express server with HTTP and socket.io, attach socket.io to the HTTP server, enable express.json parsing, and configure the port from env for public access.

Set up a cloud MongoDB Atlas database for your multiplayer tic tac toe game, create a project and cluster, configure a user and access, and connect with mongoose in Node.js.

Install the socket io client in Flutter, configure a singleton socket client with web socket transport, and set server IP address and port 3000 to enable client server socket communication.

Create a socket methods class, obtain the socket client instance, and emit a create room event with the player name to trigger server actions and database updates.

configure a node server with socket.io to handle socket connection via io.on('connection'), listen for socket.on('create room') with a player name, enabling client-server communication and testing with npm run dev.

Define a room model in MongoDB using mongoose, with occupancy 2, max rounds 3, and current round 1; store two players (name, socket id, points, type) and a turn index.

Learn to handle the create room event on the server: create and save a room with a player X, join the room, and emit create room success to all participants.

Listen for the create room success event in the Flutter client and navigate to the game screen after registering the game route, wiring the socket listener in initState, with rooms stored in MongoDB.

Learn to manage TicTacToe room state with Flutter provider by creating a room data provider, registering it in main.dart, and updating room data on create room success.

Emit a join room event with player name and room ID. Validate inputs, update room in MongoDB with the player, save, and emit join room data to the front end.

Implement join room success and error listeners, update room data via the room data provider, and navigate to the game screen while displaying room details for testing.

Create a player model class with name, socketId, points, and playerType, including toMap and fromMap methods to align with the server, enabling player display in the game screen.

Manage player state in the room data provider by adding player one and player two, with update methods and socket-driven user interface refresh.

Create a Flutter waiting lobby widget that shows a read-only room ID from the room data provider, displays a progress indicator, and waits for another player to join.

Emit the update room event on the server and listen for it on the lobby and game screen to keep room data and player state in sync.

Implement a top scoreboard in the game screen that displays player names and points, wired to the room data provider to update as matches progress.

Create a three-by-three tic tac toe board UI in Flutter using a grid view builder, with bordered cells and X or O display planned for the game screen.

Learn to display X and O values in real time by emitting tap events from the client to the node server and updating a nine-grid display via socket updates.

Enable turn-based gameplay in the multiplayer tic tac toe app by using an absorb pointer widget to disable clicks when not your turn and display the current player's name.

Determine the game winner or draw by checking horizontal, vertical, and diagonal three-in-a-row with a room data provider and display elements, and show a dialog for game end.

Display a non-dismissible dialog showing the winner's name after each turn and emit a winner event with the winner's socket ID and room in the Flutter tic tac toe app.

Listen for tap events on the server, determine the current symbol (X or O), switch turns, update room data, and broadcast moves to clients for real time board updates.

Implement play again by resetting the board and adding an absorbing state to prevent double taps, while updating room data and winner logic for synchronized turns.

Listen to winner event on the server, identify winner by socket id, increment the winner's points, check max rounds, and emit end game data to the room.

Listen to end game event and display a game dialog box saying the winner, update player data, notify listeners to refresh screens, in a Flutter socket-based multiplayer TicTacToe app.

Test the multiplayer tic tac toe app by creating and joining rooms, playing rounds, fixing bugs, and improving user experience with a reset to the main screen.