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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
Simple Simple Simple String Expansion
3,472alansun
Strings
Regular Expressions
Fundamentals
6 kyu
FIXME: Hello
2,356dinglemouse
Debugging
5 kyu
String incrementer
48,528parceval
Regular Expressions
Strings
5 kyu
Convert PascalCase string into snake_case
14,926OlgaGr
Strings
Algorithms
Regular Expressions
6 kyu
Find the unique number
144,659isqua
Fundamentals
Algorithms
Arrays
Performance
6 kyu
Character with longest consecutive repetition
11,470suic
Strings
Fundamentals
Algorithms
6 kyu
Matrix Addition
13,486xDranik
Matrix
Arrays
Algorithms
6 kyu
Duplicate Encoder
220,398obnounce
Strings
Arrays
Fundamentals
6 kyu
Sort the odd
107,505fyvfyv
Fundamentals
Arrays
Sorting
6 kyu
Loneliest character
1,345aplefull
Strings
Algorithms
7 kyu
Duplicate sandwich
1,697topping
Lists
Fundamentals
6 kyu
Remove the parentheses
6,777topping
Strings
Algorithms
Regular Expressions
Fundamentals
Retired
Vasya - Clerk (retired)
54,207AlexIsHappy
Fundamentals
Mathematics
Algorithms
Logic
Numbers
Games
7 kyu
Mispelled word
2,007int3_0xcc
Strings
Arrays
Fundamentals
7 kyu
Simple array product
1,179KenKamau
Fundamentals
7 kyu
Row Weights
23,837MrZizoScream
Fundamentals
Arrays
7 kyu
Functional Addition
17,563amrdraz
Functional Programming
Fundamentals
6 kyu
Primorial Of a Number
6,757MrZizoScream
Fundamentals
Arrays
Number Theory
6 kyu
zipWith
6,721JohanWiltink
Lists
Arrays
Functional Programming
Algorithms
6 kyu
Write Number in Expanded Form
79,899Belax8
Strings
Mathematics
Algorithms
Fundamentals
7 kyu
The Pony Express
3,244dinglemouse
Fundamentals
4 kyu
Human readable duration format
82,255davazp
Strings
Date Time
Algorithms
7 kyu
The Four Seasons
674valentinaps
Fundamentals
7 kyu
Product ID from URL
1,023JacoslawPL
Strings
Fundamentals
6 kyu
Character counts
343RobinKnipe
Fundamentals
Algorithms
Strings
7 kyu
Count strings in objects
6,718franzmoro88
Strings
Arrays
Fundamentals
7 kyu
All unique
12,465pinelopi
Algorithms
Strings
6 kyu
Data Reverse
24,210sataman
Arrays
Fundamentals
Retired
Checking Groups (retired)
7,129JS01
Algorithms
Data Structures
Strings
Data Types
6 kyu
"Stringing"+"Me"+"Along"
6,794shinchy
Functional Programming
Fundamentals
6 kyu
Next Version
2,045AzariasB
Arrays
Strings
Algorithms
Retired
Did I Finish my Sudoku? (retired)
15,659suuuzi
Mathematics
Puzzles
Games
Game Solvers
6 kyu
Compare Versions
3,768prksingh
Strings
Fundamentals
6 kyu
Pair of gloves
14,939AzariasB
Arrays
Puzzles
6 kyu
Jokes you've been 'awaiting' for ... promise
2,561richkotze
Promises
Asynchronous
Fundamentals
6 kyu
Simple Encryption #1 - Alternating Split
28,468user5036852
Cryptography
Algorithms
Strings
Arrays
Fundamentals
6 kyu
Unary function chainer
6,991tpatja
Functional Programming
Fundamentals
6 kyu
Calculate String Rotation
7,290obnounce
Strings
Arrays
Algorithms
6 kyu
Where is my parent!?(cry)
6,929smolen
Fundamentals
6 kyu
Simple Substitution Cipher Helper
3,605jacobb
Ciphers
Security
Object-oriented Programming
Strings
Algorithms
5 kyu
Regex Password Validation
28,346EricFreeman
Regular Expressions
Fundamentals
5 kyu
Phone Directory
6,719g964
Fundamentals
Strings
6 kyu
Are we alternate?
4,569cheeze
Algorithms
Strings
5 kyu
Play with two Strings
3,500smile67
Fundamentals
Strings
Algorithms
6 kyu
The Office V - Find a Chair
2,863PG1
Fundamentals
Arrays
Strings
6 kyu
Fold an array
11,017user5036852
Fundamentals
Logic
Mathematics
Algorithms
6 kyu
Elimination Tournament
1,087JOLee83
Arrays
Fundamentals
Algorithms
6 kyu
Group in 10s
988matthewglover
Arrays
Lists
Fundamentals
6 kyu
Name to Matrix
760Coder_38
Strings
Arrays
Algorithms
Matrix
4 kyu
Roman Numerals Helper
29,742jhoffner
Algorithms
Object-oriented Programming
6 kyu
Travelling on a Grid
601mmalkavian
Puzzles
Algorithms
6 kyu
I am very very very....
282ben8p
Fundamentals
Strings
5 kyu
Best travel
20,521g964
Fundamentals
6 kyu
Highest Scoring Word
99,493PG1
Fundamentals
Strings
Arrays