Design a Snake and Ladder Game

Difficulty: Hard

Source: awesome-low-level-design

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Requirements

1. Board with 100 numbered cells
2. Predefined snakes and ladders
3. Multiple players with unique pieces
4. Roll dice to move forward
5. Snake head -- slide to tail
6. Ladder base -- climb to top
7. First to final cell wins
8. Support concurrent game sessions

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Class Diagram

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Classes, Interfaces and Enumerations

Class/Interface	Description
Board	Size (100), snake/ladder positions; determine new position after move
Player	Name, current position
Snake	Start (head), end (tail)
Ladder	Start (base), end (top)
Dice	Roll returns random value 1-6
SnakeAndLadderGame	Board, players, dice; game loop logic
GameManager	Singleton; manages multiple game sessions in separate threads

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Design Patterns Used

Pattern	Application
Singleton	GameManager provides a single coordination point for managing multiple concurrent game sessions
Concurrency via Threading	Each game session runs in its own thread, allowing multiple games simultaneously

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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