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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
81,256wthit56
Arrays
Fundamentals
Algorithms
6 kyu
Matrix Rotation
460cyril-lemaire
Matrix
Fundamentals
6 kyu
Longest palindrome
1,273georgesykes86
Arrays
Strings
Algorithms
6 kyu
Linked Lists - Insert Nth Node
2,655JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Iterative Reverse
573JDeBolt
Linked Lists
Data Structures
Algorithms
6 kyu
Linked Lists - Remove Duplicates
2,138JDeBolt
Linked Lists
Data Structures
Fundamentals
7 kyu
Find the K-th last element of a singly linked list
401SergiuB
Linked Lists
Lists
Data Structures
Fundamentals
7 kyu
Linked Lists - Get Nth Node
5,547JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Length & Count
9,865JDeBolt
Linked Lists
Data Structures
Fundamentals
7 kyu
Merge two arrays
4,459billfero
Fundamentals
Arrays
7 kyu
Reverse a Number
13,615MattWatt
Algorithms
Fundamentals
5 kyu
Binary search tree validation
950plastic
Trees
Recursion
Data Structures
Algorithms
6 kyu
Is a number prime?
111,782arithmetric
Mathematics
Algorithms
6 kyu
Group Anagrams
1,270dulaccc
Algorithms
Data Structures
5 kyu
Conway's Game of Life
2,278ssineriz
Games
Graphics
Puzzles
Cellular Automata
7 kyu
Fizz / Buzz
3,976ztbrown
Mathematics
Algorithms
6 kyu
Fizz Buzz Reloaded
277the_Hamster
Fundamentals
6 kyu
Singly Linked List - Swap Nodes
113cyril-lemaire
Linked Lists
Fundamentals
Algorithms
6 kyu
Vending Machine
828adrian.eyre
Arrays
Fundamentals
6 kyu
Maze Runner
7,472adrian.eyre
Arrays
Fundamentals
5 kyu
Binary Tree Traversal
1,949Ban-Ath
Binary Trees
Trees
Recursion
Data Structures
Algorithms
4 kyu
JSON Parser
201joebandenburg
JSON
Parsing
Algorithms
5 kyu
Human Readable Time
142,258BattleRattle
Date Time
Mathematics
Algorithms
4 kyu
Snail
75,574stevenbarragan
Arrays
Algorithms
5 kyu
Vector class
8,516eugene-bulkin
Object-oriented Programming
Algorithms
Linear Algebra
6 kyu
Prime Word
540sazzadshopno
Fundamentals
5 kyu
Find the smallest
5,455g964
Fundamentals
6 kyu
NASA Countdown
264lilc4t
Date Time
Fundamentals
6 kyu
Kata 2019: Combine Fruits
195myjinxin2015
Algorithms
Performance
5 kyu
Coding with Squared Strings
2,045g964
Fundamentals
Strings
Ciphers
Cryptography
5 kyu
Topological Sort
60brickshot
Algorithms
Graph Theory
Sorting
6 kyu
Word Mesh
1,540rt-hawk
Regular Expressions
Arrays
Strings
Fundamentals
6 kyu
Simple Web Framework #1: Create a basic router
1,539int3_0xcc
Object-oriented Programming
Arrays
Fundamentals