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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
Snail
77,434stevenbarragan
Arrays
Algorithms
4 kyu
Twice linear
23,366g964
Mathematics
Algorithms
4 kyu
Sum by Factors
19,505g964
Arrays
Algorithms
Mathematics
4 kyu
Hamming Numbers
12,014xcthulhu
Number Theory
Algorithms
4 kyu
Magnet particules in boxes
7,695g964
Mathematics
Matrix
Algorithms
4 kyu
Matrix Determinant
23,510pjfranzini
Matrix
Linear Algebra
Mathematics
Recursion
Algorithms
4 kyu
Sort binary tree by levels
13,646kars7e
Trees
Binary Trees
Performance
Algorithms
Sorting
4 kyu
Strings Mix
23,504g964
Fundamentals
Strings
4 kyu
How many numbers III?
4,228raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
4 kyu
Regular expression for binary numbers divisible by 5
2,235aswitalski
Binary
Algorithms
Regular Expressions
4 kyu
Most frequently used words in a text
28,613markprzepiora
Strings
Filtering
Algorithms
Regular Expressions
4 kyu
parseInt() reloaded
18,066BattleRattle
Parsing
Strings
Algorithms
4 kyu
Breadcrumb Generator
4,642GiacomoSorbi
Parsing
Regular Expressions
Algorithms
4 kyu
Simplifying multilinear polynomials
4,864SleepingCode
Mathematics
Strings
Regular Expressions
Parsing
Fundamentals
4 kyu
Simplexer
725Mihail-K
Strings
Parsing
Algorithms
4 kyu
Bridge Puzzle
159ecolban
Recursion
Puzzles
4 kyu
Bribe the Guards of the Crown Jewels
233ecolban
Dynamic Programming
Algorithms
4 kyu
Mystery Function
2,190ecolban
Fundamentals
4 kyu
Esolang Interpreters #3 - Custom Paintf**k Interpreter
2,815donaldsebleung
Esoteric Languages
Interpreters
Algorithms
Tutorials
4 kyu
Vigenère Cipher Helper
8,478jacobb
Algorithms
Ciphers
Security
Object-oriented Programming
Strings
4 kyu
Codewars style ranking system
17,370jhoffner
Algorithms
Object-oriented Programming
7 kyu
Binary sXORe
883NaMe613
Binary
Algorithms
4 kyu
Numbers with Collatz Starting Patterns
62Bubbler
Algorithms
Puzzles
Mathematics
4 kyu
Count Squares In the Chess Board
354myjinxin2015
Algorithms
Dynamic Programming
4 kyu
Boggle Word Checker
3,648evan-eleven
Arrays
Recursion
Puzzles
4 kyu
Simple maze
1,018eugene-katsevman
Queues
Recursion
Algorithms
4 kyu
The Greatest Warrior
3,534BurstNova
Algorithms
Object-oriented Programming
4 kyu
Explosive Sum
8,794surtich
Algorithms
Mathematics
Fundamentals
4 kyu
Sum of Intervals
39,264xDranik
Algorithms
Performance
4 kyu
Binary multiple of 3
7,509rsalgado
Regular Expressions
Algorithms
Puzzles
Number Theory
4 kyu
So Many Permutations!
48,342BattleRattle
Permutations
Strings
Algorithms
4 kyu
Count ones in a segment
3,216d0n14
Binary
Performance
Algorithms
4 kyu
Differentiate a polynomial
2,967samhstn
Algorithms
Strings
Fundamentals
4 kyu
NIM the game
857xcthulhu
Mathematics
Games
Puzzles
4 kyu
SKRZAT!!!
936Frzy
Binary
Algorithms
4 kyu
Shallowest path across the river
92ecolban
Algorithms
Graph Theory
4 kyu
Roman Numerals Helper
30,826jhoffner
Algorithms
Object-oriented Programming
5 kyu
Multiples of 3, you say?
116donaldsebleung
Theorem Proving
Puzzles
4 kyu
Permutational Primes
430raulbc777
Algorithms
Sorting
Permutations
Mathematics
Memoization
Data Structures
4 kyu
Sortable Poker Hands
479FrankK
Games
Fundamentals
Sorting
Design Patterns
Algorithms
4 kyu
Ranking Poker Hands
3,375FrankK
Games
Algorithms
Object-oriented Programming
4 kyu
Dice rolls threshold
147kirilloid
Probability
Combinatorics
Algorithms
4 kyu
Validate Sudoku with size `NxN`
9,507cbmono
Arrays
Puzzles
Algorithms
Object-oriented Programming
4 kyu
Memoized Log Cutting
1,433AlejandorLazaro
Dynamic Programming
Memoization
Refactoring
4 kyu
We are Family
155user6793616
Algorithms
Graph Theory
4 kyu
Helpers For a 3DGame I: Biggest Triangle in a Sphere
284raulbc777
Data Structures
Algorithms
Mathematics
Logic
Strings
Geometry
Games
4 kyu
Counting String Subsequences
658hermanschaaf
Algorithms
Dynamic Programming
Strings
4 kyu
Can you really count divisors?
502kabaczek83
Algorithms
Mathematics
4 kyu
Human readable duration format
84,041davazp
Strings
Date Time
Algorithms
4 kyu
Burrows-Wheeler-Transformation
1,977muesli4
Lists
Puzzles
Algorithms
4 kyu
Coloured Lattice Points Forming Coloured Triangles
564raulbc777
Fundamentals
Data Structures
Algorithms
Geometry
Mathematics
Logic
Strings
4 kyu
Pyramid Slide Down
18,455rodentrabies
Algorithms
Dynamic Programming
4 kyu
Algebraic Lists
1,957edalorzo
Lists
Algebra
Algorithms
4 kyu
5x5 Nonogram Solver
525Avanta
Algorithms
Logic
Games
Game Solvers
4 kyu
Tracking pawns
503Nmistrata
Strings
Arrays
Algorithms
Puzzles
4 kyu
Smallest possible sum
7,724dkhaburdzania
Algorithms
Mathematics
Arrays
4 kyu
Product-Sum Numbers
86mertcanekiz
Mathematics
Algorithms
4 kyu
Matunga coins
71Hyyudu
Algorithms
Mathematics
Combinatorics
Performance
4 kyu
Domino Tiling - 2 x N Board
136Bubbler
Mathematics
Algorithms
Dynamic Programming
Puzzles
4 kyu
Brainfuck Translator
817Varveyn
Esoteric Languages
Strings
4 kyu
String -> X-Iterations -> String
327Jomopipi
Algorithms
Puzzles
Mathematics
Language Features
4 kyu
Find the unknown digit
8,269JJ-Bug
Mathematics
Algorithms
Puzzles
4 kyu
Ten-Pin Bowling
3,535dnolan
Algorithms
Puzzles
4 kyu
Mahjong - #1 Pure Hand
198Hacker Sakana
Games
Logic
Algorithms
4 kyu
Compute a convex hull
422dustryder
Algorithms
Geometry
4 kyu
Tower Defense: Risk Analysis
196docgunthrop
Logic
Games
Algorithms
Object-oriented Programming
4 kyu
Number of integer partitions
2,031tony_m
Mathematics
Algorithms
Discrete Mathematics
4 kyu
Bernoulli numbers
254JustyFY
Fundamentals
Mathematics
Number Theory
Algorithms
4 kyu
Bezier Curves
74ecolban
Fundamentals
4 kyu
Generic number class
362Dundee
Mathematics
Metaprogramming
Algorithms
4 kyu
Currying vs. Partial Application
2,660surtich
Functional Programming
4 kyu
RoboScript #3 - Implement the RS2 Specification
854donaldsebleung
Esoteric Languages
Interpreters
Regular Expressions
Algorithms