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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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6 kyu
Two Sum
82,150wthit56
Arrays
Fundamentals
Algorithms
6 kyu
Matrix Rotation
465cyril-lemaire
Matrix
Fundamentals
6 kyu
Longest palindrome
1,279georgesykes86
Arrays
Strings
Algorithms
6 kyu
Linked Lists - Insert Nth Node
2,710JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Iterative Reverse
575JDeBolt
Linked Lists
Data Structures
Algorithms
6 kyu
Linked Lists - Remove Duplicates
2,193JDeBolt
Linked Lists
Data Structures
Fundamentals
7 kyu
Find the K-th last element of a singly linked list
405SergiuB
Linked Lists
Lists
Data Structures
Fundamentals
7 kyu
Linked Lists - Get Nth Node
5,567JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Length & Count
9,943JDeBolt
Linked Lists
Data Structures
Fundamentals
7 kyu
Merge two arrays
4,466billfero
Fundamentals
Arrays
7 kyu
Reverse a Number
13,693MattWatt
Algorithms
Fundamentals
5 kyu
Binary search tree validation
950plastic
Trees
Recursion
Data Structures
Algorithms
6 kyu
Is a number prime?
112,465arithmetric
Mathematics
Algorithms
6 kyu
Group Anagrams
1,280dulaccc
Algorithms
Data Structures
5 kyu
Conway's Game of Life
2,284ssineriz
Games
Graphics
Puzzles
Cellular Automata
7 kyu
Fizz / Buzz
3,993ztbrown
Mathematics
Algorithms
6 kyu
Fizz Buzz Reloaded
279the_Hamster
Fundamentals
6 kyu
Singly Linked List - Swap Nodes
113cyril-lemaire
Linked Lists
Fundamentals
Algorithms
6 kyu
Vending Machine
833adrian.eyre
Arrays
Fundamentals
6 kyu
Maze Runner
7,498adrian.eyre
Arrays
Fundamentals
5 kyu
Binary Tree Traversal
2,025Ban-Ath
Binary Trees
Trees
Recursion
Data Structures
Algorithms
4 kyu
JSON Parser
202joebandenburg
JSON
Parsing
Algorithms
5 kyu
Human Readable Time
143,311BattleRattle
Date Time
Mathematics
Algorithms
4 kyu
Snail
76,225stevenbarragan
Arrays
Algorithms
5 kyu
Vector class
8,555eugene-bulkin
Object-oriented Programming
Algorithms
Linear Algebra
6 kyu
Prime Word
543sazzadshopno
Fundamentals
5 kyu
Find the smallest
5,484g964
Fundamentals
6 kyu
NASA Countdown
264lilc4t
Date Time
Fundamentals
6 kyu
Kata 2019: Combine Fruits
195myjinxin2015
Algorithms
Performance
5 kyu
Coding with Squared Strings
2,048g964
Fundamentals
Strings
Ciphers
Cryptography
5 kyu
Topological Sort
62brickshot
Algorithms
Graph Theory
Sorting
6 kyu
Word Mesh
1,554rt-hawk
Regular Expressions
Arrays
Strings
Fundamentals
6 kyu
Simple Web Framework #1: Create a basic router
1,548int3_0xcc
Object-oriented Programming
Arrays
Fundamentals