Design Tic Tac Toe Game

Difficulty: Medium Source: awesome-low-level-design

Requirements

  1. 3x3 grid
  2. Two players alternate placing X and O
  3. Three in a row (horizontal, vertical, or diagonal) wins
  4. All cells filled with no winner is a draw
  5. Display grid and accept moves
  6. Handle turns and validate moves
  7. Detect winner or draw

Class Diagram

Class Diagram

Classes, Interfaces and Enumerations

Class/Interface Description
Player name, symbol (X or O)
Board 3x3 grid; methods to make moves, check winner, check if full
Game Game flow, turn handling, move validation, outcome detection

Design Patterns Used

Pattern Application
OO Decomposition Clear separation of Player, Board, and Game responsibilities
MVC-like Separation Board manages state, Game controls logic, display is separated from data

Code Implementations

Language Source Code
Java View on GitHub
Python View on GitHub
C++ View on GitHub
C# View on GitHub
Go View on GitHub