Strengthen your coding skills by practicing one of our katas

By Chris Brown

Axelrod’s Tournament

• Competent
• TDD
• Algorithm Design

By Riley Wallace

Palindrome Radar

• Beginner
• Classicist TDD

By Emmanuel Valverde

Morning Routine

• refactoring
• Mocking
• katas

By Rowan Lea, Software Craftsperson

Songbird

• TDD
• katas
• Test Driven Development

By Emmanuel Valverde

Shopping cart

• Mocking
• Test Driven Development
• Outside-In TDD
• Object Oriented Design

By Emmanuel Valverde

ATM machine

• Beginner
• Mocking
• Test Driven Development
• Object Oriented Design

By Jordan Colgan

Stack

• Beginner
• Data Structures
• Algorithm Design

By Mattsi Jansky

Santa's Allotment

• Competent
• Test Driven Development

By Tom Kellet

Let's build a Christmas tree

• Beginner
• Test Driven Development

By Rowan Lea, Software Craftsperson

12 Days of Christmas

• Beginner
• Test Driven Development

By Emmanuel Valverde

Guess the random number

• Beginner
• Mocking
• Test Driven Development
• Object Oriented Design

By Mauro Chojrin

Sudoku kata

• Competent
• Test Driven Development
• Object Oriented Design
• Algorithm Design

By Mark Gray

Battleships

• Competent
• Outside-In TDD
• Data Structures
• Object Oriented Design

By Terry Hughes

Gilded Rose

• Competent
• Property Based Testing
• Legacy Code

By Jordan Colgan

Smart Fridge

• Competent
• Design Patterns
• Outside-In TDD

By Roy Osherove

String Calculator

• Beginner
• Data Structures
• Algorithm Design
• Classicist TDD

By Danil Suits

Mars Rover

• Competent
• Design Patterns
• Test Driven Development
• Object Oriented Design

By John Horton Conway

Conway's Game of Life

• Competent
• Design Patterns
• Data Structures
• Object Oriented Design
• Property Based Testing

By Giulio Perrone

Ants

• Competent
• Test Driven Development
• Algorithm Design

By Giulio Perrone

Enchanting

• Competent
• Test Driven Development
• Data Structures
• Algorithm Design

By Coding Dojo

Tennis

• Competent
• Algorithm Design
• Classicist TDD

By Sandro Mancuso, Co-founder and Group CEO

Bank

• Competent
• Outside-In TDD
• Object Oriented Design

By Matheus Marabesi and Emmanuel Valverde

Text Processing

• Beginner
• Test Driven Development
• Data Structures

By Giulio Perrone

Spiders

• Beginner
• Test Driven Development
• Outside-In TDD
• Data Structures

By Giulio Perrone

Arithmetics

• Beginner
• Test Driven Development
• Data Structures
• Algorithm Design

By Giulio Perrone

Bags

• Beginner
• Test Driven Development
• Data Structures

By Emmanuel Valverde and Fran Iglesias

Password Validation

• Beginner
• Design Patterns
• Test Driven Development
• Object Oriented Design

By Sean Johnston

Bowling

• Competent
• Outside-In TDD
• Data Structures
• Algorithm Design

By Coding Dojo

Roman Numerals

• Beginner
• Algorithm Design
• Classicist TDD

By Lee Sanderson, Principal Software Craftsperson

Simple Mars Rover

• Beginner
• Design Patterns
• Object Oriented Design

By Sandro Mancuso, Co-founder and Group CEO

Corporate Hotel Booking

• Expert
• Outside-In TDD
• Object Oriented Design

By Coding Dojo

FizzBuzz

• Novice
• Test Driven Development
• Classicist TDD

By Norman Soetbeer

Leap Year

• Beginner
• Algorithm Design
• Classicist TDD