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Start training on this collection. Each time you skip or complete a kata you will be taken to the next kata in the series. Once you cycle through the items in the collection you will revert back to your normal training routine.

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4 kyu
Simple Memory Manager
713SteveRuble
Linked Lists
Data Structures
Algorithms
4 kyu
5x5 Nonogram Solver
547Avanta
Algorithms
Logic
Games
Game Solvers
2 kyu
15x15 Nonogram Solver
321Bubbler
Puzzles
Games
Performance
Game Solvers
Retired
Calculator (retired)
11,547obrok
Algorithms
Parsing
Logic
Strings
Expressions
Basic Language Features
Fundamentals
2 kyu
Change detection decorator
203zellerede
Decorator
Algorithms
Metaprogramming
1 kyu
Square sums
638metalim
Algorithms
Mathematics
4 kyu
Escape the maze
930cyril-lemaire
Fundamentals
Algorithms
4 kyu
Tracking pawns
514Nmistrata
Strings
Arrays
Algorithms
Puzzles
3 kyu
Reversi Win Checker
71DatabaseMonkey
Puzzles
Games
Algorithms
1 kyu
7×7 Skyscrapers
2,097JohanWiltink
Algorithms
Games
Performance
3 kyu
Screen Locking Patterns
5,067rsalgado
Mathematics
Combinatorics
Geometry
Algorithms
Graph Theory
3 kyu
The Lift
3,484dinglemouse
Algorithms
Queues
Data Structures
3 kyu
Divide integers as strings
1,147Voile
Strings
Fundamentals
Big Integers
Algorithms
5 kyu
Snakes and Ladders
7,453adrian.eyre
Design Patterns
Games
Fundamentals
2 kyu
Hard Sudoku Solver
905f.rodrigues
Games
Algorithms
Game Solvers
Puzzles
4 kyu
Boggle Word Checker
3,769evan-eleven
Arrays
Recursion
Puzzles
4 kyu
Brainfuck Translator
834Varveyn
Esoteric Languages
Strings
4 kyu
Sortable Poker Hands
501FrankK
Games
Fundamentals
Sorting
Design Patterns
Algorithms
3 kyu
Alphametics Solver
448docgunthrop
Puzzles
Performance
Cryptography
Algorithms
4 kyu
Generic number class
376Dundee
Mathematics
Metaprogramming
Algorithms
4 kyu
Differentiate a polynomial
3,049samhstn
Algorithms
Strings
Fundamentals
5 kyu
Solve For X
171Belax8
Algorithms
Puzzles
Mathematics
Fundamentals
5 kyu
Connect 4
1,608adrian.eyre
Arrays
Fundamentals
5 kyu
Calculating with Functions
86,652BattleRattle
Functional Programming
3 kyu
Esolang Interpreters #4 - Boolfuck Interpreter
2,172donaldsebleung
Esoteric Languages
Interpreters
Algorithms
Tutorials
4 kyu
Simple maze
1,048eugene-katsevman
Queues
Recursion
Algorithms
4 kyu
A Knight's Tour
183emef
Algorithms
4 kyu
Codewars style ranking system
18,094jhoffner
Algorithms
Object-oriented Programming
4 kyu
Simplexer
752Mihail-K
Strings
Parsing
Algorithms
4 kyu
Lazy Init
371simosini
Metaprogramming
3 kyu
Count Connectivity Components
535ecolban
Strings
Algorithms
Graph Theory
3 kyu
The builder of things
1,045jhoffner
Metaprogramming
Domain Specific Languages
Algorithms
Language Features
5 kyu
Josephus Permutation
16,749GiacomoSorbi
Mathematics
Permutations
Algorithms
Combinatorics
5 kyu
Packing your backpack
939Frederikbh
Algorithms
Dynamic Programming
5 kyu
Limited number of instances
99FArekkusu
Object-oriented Programming
Metaprogramming
2 kyu
Whitespace Interpreter
1,135jacobb
Esoteric Languages
Interpreters
Algorithms
2 kyu
Debugger
693Dundee
Metaprogramming
4 kyu
Coloured Lattice Points Forming Coloured Triangles
581raulbc777
Fundamentals
Data Structures
Algorithms
Geometry
Mathematics
Logic
Strings
4 kyu
Hide a message in a deck of playing cards
284Zwyx
Cryptography
Mathematics
Games
Permutations
Algorithms
Beta
Derpcode Interpreter
55beniolenio
Status:Testing & feedback needed
Estimated Rank:
6 kyu
Esoteric Languages
Interpreters
Algorithms
3 kyu
Binomial Expansion
6,615TheDoctor
Mathematics
Algebra
Algorithms
3 kyu
Metaclasses - Simple Django Models
331horejsek
Object-oriented Programming
Metaprogramming
Backend
3 kyu
Plants and Zombies
723docgunthrop
Logic
Games
Game Solvers
Algorithms
Object-oriented Programming
3 kyu
Blobservation
399docgunthrop
Logic
Games
Object-oriented Programming
Performance
Algorithms
3 kyu
Papers, Please
813docgunthrop
Object-oriented Programming
Games
Regular Expressions
Fundamentals
2 kyu
Regular Expression - Check if divisible by 0b111 (7)
2,275Hacker Sakana
Puzzles
Regular Expressions
Strings
Algorithms
6 kyu
Hint a Type
58Admiraal
Recursion
Algorithms
4 kyu
We are Family
161user6793616
Algorithms
Graph Theory
4 kyu
Vigenère Cipher Helper
8,930jacobb
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
4 kyu
Currying vs. Partial Application
2,839surtich
Functional Programming
3 kyu
RoboScript #4 - RS3 Patterns to the Rescue
591donaldsebleung
Esoteric Languages
Interpreters
Functional Programming
Algorithms
4 kyu
Ordered set
85FArekkusu
Algorithms
Data Structures
3 kyu
Minimal Cost Binary Search Trees
99ecolban
Algorithms
Binary Search Trees
Fundamentals
2 kyu
Game of Go
405edwin0258
Games
Performance
Algorithms
1 kyu
Functional SQL
2,879surtich
Functional Programming
Algorithms
Retired
Arbitrary-Length Integer Arithmetic (retired)
207laoris
Algorithms
Mathematics
Big Integers
2 kyu
Simple SQL Engine
517SteveRuble
SQL
Parsing
Sets
Databases
Algorithms