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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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7 kyu
Shortest Word
244,266PG1
Fundamentals
7 kyu
Two to One
172,558g964
Fundamentals
6 kyu
Detect Pangram
186,312anindyabd
Strings
Data Structures
Fundamentals
6 kyu
Equal Sides Of An Array
128,439Shivo
Algorithms
Arrays
Fundamentals
7 kyu
Regex validate PIN code
178,869JMurphyWeb
Regular Expressions
Fundamentals
8 kyu
Century From Year
209,174MrZizoScream
Fundamentals
Mathematics
6 kyu
Sort the odd
109,883fyvfyv
Fundamentals
Arrays
Sorting
6 kyu
Build Tower
102,6308fdafs2
Strings
ASCII Art
Fundamentals
7 kyu
Find the divisors!
88,341kwy95
Mathematics
Algorithms
6 kyu
Highest Scoring Word
101,619PG1
Fundamentals
Strings
Arrays
8 kyu
Array plus array
87,722Dmitry Kudla
Fundamentals
Arrays
Debugging
8 kyu
Total amount of points
111,954petrosernivka
Fundamentals
Arrays
Strings
8 kyu
Sum Mixed Array
101,680PG1
Fundamentals
Strings
Arrays
8 kyu
Quarter of the year
119,509Orses
Fundamentals
Mathematics
7 kyu
Testing 1-2-3
77,169acr
Arrays
Fundamentals
6 kyu
Which are in?
80,722g964
Arrays
Lists
Strings
Refactoring
6 kyu
Shortest steps to a number
3,986bdowds
Puzzles
Mathematics
Fundamentals
Games
6 kyu
Merge in 2048
904mrfox
Games
Arrays
Algorithms
7 kyu
Is this a valid Chess960 position?
671LegendaryFartMaster
Fundamentals
Algorithms
Games
Strings
6 kyu
Bishop Movement checker
508user7314902
Games
Mathematics
Algorithms
7 kyu
Block the Square in Tic Tac Toe
231saudiGuy
Games
Logic
Algorithms
6 kyu
Two Sum
83,619wthit56
Arrays
Fundamentals
Algorithms
6 kyu
Write Number in Expanded Form
81,499Belax8
Strings
Mathematics
Algorithms
Fundamentals
6 kyu
Write Number in Expanded Form - Part 2
2,042Belax8
Mathematics
Algorithms
Fundamentals
6 kyu
Mexican Wave
70,587adrian.eyre
Arrays
Strings
Fundamentals
8 kyu
Stringy Strings
39,019andrewMacmurray
Strings
Binary
Algorithms
8 kyu
Well of Ideas - Easy Version
35,781PG1
Fundamentals
Arrays
Strings
Refactoring
7 kyu
Check the exam
32,051Dmitry Kudla
Fundamentals
Arrays
8 kyu
Bin to Decimal
32,691wichu
Binary
Fundamentals
7 kyu
Form The Minimum
28,069MrZizoScream
Fundamentals
7 kyu
Alternate capitalization
33,476KenKamau
Strings
Fundamentals
7 kyu
Flatten and sort an array
28,851lilsweetcaligula
Arrays
Sorting
Fundamentals
7 kyu
Parts of a list
17,074g964
Arrays
Lists
Data Structures
Algorithms
7 kyu
Moves in squared strings (I)
13,824g964
Fundamentals
Algorithms
Strings
7 kyu
Alphabet symmetry
14,660KenKamau
Strings
Fundamentals
7 kyu
Divide and Conquer
15,817PG1
Fundamentals
Strings
Arrays
8 kyu
The 'if' function
33,264user578387
Functional Programming
Fundamentals
7 kyu
Coloured Triangles
10,953Avanta
Logic
Strings
Algorithms
6 kyu
Multiplication table
40,974Bugari
Arrays
Fundamentals
6 kyu
Encrypt this!
22,966suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
6 kyu
Meeting
20,839g964
Fundamentals
6 kyu
IP Validation
42,342wink
Regular Expressions
Algorithms
6 kyu
Give me a Diamond
37,061jayeshcp
Strings
ASCII Art
Fundamentals
6 kyu
Help the bookseller !
29,951g964
Fundamentals
Algorithms
6 kyu
Reverse or rotate?
23,624g964
Algorithms
Strings
6 kyu
Fold an array
11,241user5036852
Fundamentals
Logic
Mathematics
Algorithms
6 kyu
Pyramid Array
18,860sahglie
Algorithms
6 kyu
Unique In Order
187,274pinelopi
Algorithms
Fundamentals
7 kyu
Building blocks
12,396NaMe613
Object-oriented Programming
Fundamentals
7 kyu
Simple consecutive pairs
11,082KenKamau
Arrays
Fundamentals
7 kyu
Sort by Last Char
9,499PG1
Fundamentals
Strings
Arrays
Sorting
7 kyu
Char Code Calculation
11,745PG1
Fundamentals
Arrays
Strings
Mathematics
7 kyu
Greatest common divisor
18,018RVdeKoning
Algorithms
Fundamentals
Recursion
7 kyu
Ones and Zeros
148,500user4386369
Fundamentals
Arrays
5 kyu
int32 to IPv4
26,969sahglie
Networks
Bits
Algorithms
8 kyu
Square(n) Sum
289,201jhoffner
Arrays
Lists
Fundamentals
5 kyu
Find numbers with 3 divisors
434Anchous
Algorithms
Mathematics
4 kyu
Snail
77,237stevenbarragan
Arrays
Algorithms
6 kyu
Break camelCase
122,016hakt
Strings
Fundamentals
7 kyu
Binary Addition
181,449garrettguy457
Binary
Fundamentals
6 kyu
Matrix Addition
13,765xDranik
Matrix
Arrays
Algorithms
6 kyu
Character with longest consecutive repetition
11,665suic
Strings
Fundamentals
Algorithms
6 kyu
Pair of gloves
15,149AzariasB
Arrays
Puzzles
6 kyu
What century is it?
11,244user1511460
Strings
Algorithms
Date Time
8 kyu
Flick Switch
13,421saudiGuy
Fundamentals
Lists