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Design a Snake and Ladder Game - Low-Level Design | OneNoughtOne

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Design a Snake and Ladder Game

Beginner

Design an object-oriented Snake and Ladder game with a configurable board (default 100 squares), snakes (head → tail, going down), ladders (bottom → top, going up), dice rolling, and turn-based multiplayer.

Players start at position 0 and take turns rolling a die. After moving, if the player lands on a snake's head, they slide down to its tail; if they land on a ladder's bottom, they climb to its top. The first player to reach exactly the final square wins (overshoot rule is configurable). The game tracks statistics including total rolls, snakes hit, and ladders climbed per player.

Core Use Cases

Initialise board

Create an N×N board (default 100) with configurable snakes and ladders

Add snakes and ladders

Place snakes (head > tail) and ladders (top > bottom) with validation (no overlap)

Add 2+ players who take turns in order

Roll dice and move

Roll dice, advance player, apply snake/ladder if landed on one

Exact finish rule

Player must land exactly on the final square to win (configurable)

Win detection

First player to reach the final square wins the game

Game statistics

Track rolls, snakes hit, ladders climbed per player

Constraints

Snake head must be strictly greater than its tail
Ladder top must be strictly greater than its bottom
A position cannot have both a snake and a ladder
The final square (100) cannot have a snake
Players start at position 0 (off the board)
With exact finish rule, a roll that overshoots the last square is forfeited

Assumptions

In-memory, single-threaded game
Minimum 2 players, no maximum (turn-based queue)
Single standard 6-faced die by default
No cascading (landing on a ladder that leads to a snake head doesn't trigger the snake)
Game auto-plays to completion in the start() method

In Scope

Board with configurable size, snakes, and ladders
Dice abstraction (standard, crooked, multiple)
Turn-based player rotation
Snake and ladder position resolution
Exact finish rule (configurable)
Win detection
Move log and player statistics

Out of Scope

GUI / visual board rendering
Network multiplayer
Save / load game state
Betting or scoring beyond win/loss
Power-ups or special squares

Approach Guide(Click to expand each section)

Before diving into code, clarify the use cases and edge cases. Understanding the problem deeply leads to better class design.

List Core Use Cases

Identify the primary actions users will perform. For a parking lot: park vehicle, exit vehicle, check availability. Each becomes a method.

Identify Actors

Who interacts with the system? Customers, admins, automated systems? Each actor type may need different interfaces.

Clarify Constraints

What are the limits? Max vehicles, supported vehicle types, payment methods. Constraints drive your data structures.

Ask About Edge Cases

What happens on overflow? Concurrent access? Payment failures? Thinking about edge cases reveals hidden complexity.

Follow-up Questions(Questions an interviewer might ask)

💡 Draw UML class diagrams, sequence diagrams, or any design visualizations. Submit from the Code tab.

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00:00:00

Design a Snake and Ladder Game

Beginner

Core Use Cases

Initialise board

Create an N×N board (default 100) with configurable snakes and ladders

Add snakes and ladders

Place snakes (head > tail) and ladders (top > bottom) with validation (no overlap)

Add 2+ players who take turns in order

Roll dice and move

Roll dice, advance player, apply snake/ladder if landed on one

Exact finish rule

Player must land exactly on the final square to win (configurable)

Win detection

First player to reach the final square wins the game

Game statistics

Track rolls, snakes hit, ladders climbed per player

Constraints

Snake head must be strictly greater than its tail
Ladder top must be strictly greater than its bottom
A position cannot have both a snake and a ladder
The final square (100) cannot have a snake
Players start at position 0 (off the board)
With exact finish rule, a roll that overshoots the last square is forfeited

Assumptions

In-memory, single-threaded game
Minimum 2 players, no maximum (turn-based queue)
Single standard 6-faced die by default
No cascading (landing on a ladder that leads to a snake head doesn't trigger the snake)
Game auto-plays to completion in the start() method

In Scope

Board with configurable size, snakes, and ladders
Dice abstraction (standard, crooked, multiple)
Turn-based player rotation
Snake and ladder position resolution
Exact finish rule (configurable)
Win detection
Move log and player statistics

Out of Scope

GUI / visual board rendering
Network multiplayer
Save / load game state
Betting or scoring beyond win/loss
Power-ups or special squares

Approach Guide(Click to expand each section)

Before diving into code, clarify the use cases and edge cases. Understanding the problem deeply leads to better class design.

List Core Use Cases

Identify the primary actions users will perform. For a parking lot: park vehicle, exit vehicle, check availability. Each becomes a method.

Identify Actors

Who interacts with the system? Customers, admins, automated systems? Each actor type may need different interfaces.

Clarify Constraints

What are the limits? Max vehicles, supported vehicle types, payment methods. Constraints drive your data structures.

Ask About Edge Cases

What happens on overflow? Concurrent access? Payment failures? Thinking about edge cases reveals hidden complexity.

Follow-up Questions(Questions an interviewer might ask)

💡 Draw UML class diagrams, sequence diagrams, or any design visualizations. Submit from the Code tab.

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Design a Snake and Ladder Game

Core Use Cases

Constraints

Assumptions

In Scope

Out of Scope

Approach Guide(Click to expand each section)

Follow-up Questions(Questions an interviewer might ask)

Explore the full editorial.

Sign in to view submissions

Design a Snake and Ladder Game

Core Use Cases

Constraints

Assumptions

In Scope

Out of Scope

Approach Guide(Click to expand each section)

Follow-up Questions(Questions an interviewer might ask)

Explore the full editorial.

Sign in to view submissions

Design a Snake and Ladder Game

Core Use Cases

Constraints

Assumptions

In Scope

Out of Scope

Approach Guide(Click to expand each section)

Gather Requirements~3 min

Identify Classes & Entities~4 min

Define Relationships~3 min

Apply Design Patterns~4 min

Apply SOLID Principles~3 min

Code Organization~2 min

Follow-up Questions(Questions an interviewer might ask)

1How would you handle cascading snakes and ladders (landing on a ladder top that has a snake)?

2How would you add different dice strategies (crooked dice, multiple dice)?

3How would you add a 'roll again on 6' rule?

4How would you support undo / replay of the game?

5How would you generate a random fair board?

Key Topics

Asked At

Explore the full editorial.

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Design a Snake and Ladder Game

Core Use Cases

Constraints

Assumptions

In Scope

Out of Scope

Approach Guide(Click to expand each section)

Gather Requirements~3 min

Identify Classes & Entities~4 min

Define Relationships~3 min

Apply Design Patterns~4 min

Apply SOLID Principles~3 min

Code Organization~2 min

Follow-up Questions(Questions an interviewer might ask)

1How would you handle cascading snakes and ladders (landing on a ladder top that has a snake)?

2How would you add different dice strategies (crooked dice, multiple dice)?

3How would you add a 'roll again on 6' rule?

4How would you support undo / replay of the game?

5How would you generate a random fair board?

Key Topics

Asked At

Explore the full editorial.

Sign in to view submissions