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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
240,907PG1
Fundamentals
7 kyu
Two to One
169,788g964
Fundamentals
6 kyu
Detect Pangram
182,895anindyabd
Strings
Data Structures
Fundamentals
6 kyu
Equal Sides Of An Array
126,618Shivo
Algorithms
Arrays
Fundamentals
7 kyu
Regex validate PIN code
175,820JMurphyWeb
Regular Expressions
Fundamentals
8 kyu
Century From Year
204,608MrZizoScream
Fundamentals
Mathematics
6 kyu
Sort the odd
108,191fyvfyv
Fundamentals
Arrays
Sorting
6 kyu
Build Tower
100,9798fdafs2
Strings
ASCII Art
Fundamentals
7 kyu
Find the divisors!
87,510kwy95
Mathematics
Algorithms
6 kyu
Highest Scoring Word
100,006PG1
Fundamentals
Strings
Arrays
8 kyu
Array plus array
86,606Dmitry Kudla
Fundamentals
Arrays
Debugging
8 kyu
Total amount of points
109,815petrosernivka
Fundamentals
Arrays
Strings
8 kyu
Sum Mixed Array
99,548PG1
Fundamentals
Strings
Arrays
8 kyu
Quarter of the year
117,021Orses
Fundamentals
Mathematics
7 kyu
Testing 1-2-3
75,417acr
Arrays
Fundamentals
6 kyu
Which are in?
79,826g964
Arrays
Lists
Strings
Refactoring
6 kyu
Shortest steps to a number
3,695bdowds
Puzzles
Mathematics
Fundamentals
Games
6 kyu
Merge in 2048
761mrfox
Games
Arrays
Algorithms
7 kyu
Is this a valid Chess960 position?
669LegendaryFartMaster
Fundamentals
Algorithms
Games
Strings
6 kyu
Bishop Movement checker
507user7314902
Games
Mathematics
Algorithms
7 kyu
Block the Square in Tic Tac Toe
225saudiGuy
Games
Logic
Algorithms
6 kyu
Two Sum
82,005wthit56
Arrays
Fundamentals
Algorithms
6 kyu
Write Number in Expanded Form
80,314Belax8
Strings
Mathematics
Algorithms
Fundamentals
6 kyu
Write Number in Expanded Form - Part 2
1,995Belax8
Mathematics
Algorithms
Fundamentals
6 kyu
Mexican Wave
69,415adrian.eyre
Arrays
Strings
Fundamentals
8 kyu
Stringy Strings
38,490andrewMacmurray
Strings
Binary
Algorithms
8 kyu
Well of Ideas - Easy Version
35,401PG1
Fundamentals
Arrays
Strings
Refactoring
7 kyu
Check the exam
31,574Dmitry Kudla
Fundamentals
Arrays
8 kyu
Bin to Decimal
32,012wichu
Binary
Fundamentals
7 kyu
Alternate capitalization
32,783KenKamau
Strings
Fundamentals
7 kyu
Flatten and sort an array
28,401lilsweetcaligula
Arrays
Sorting
Fundamentals
7 kyu
Parts of a list
16,803g964
Arrays
Lists
Data Structures
Algorithms
7 kyu
Moves in squared strings (I)
13,417g964
Fundamentals
Algorithms
Strings
7 kyu
Alphabet symmetry
14,254KenKamau
Strings
Fundamentals
7 kyu
Divide and Conquer
15,590PG1
Fundamentals
Strings
Arrays
8 kyu
The 'if' function
32,735user578387
Functional Programming
Fundamentals
7 kyu
Coloured Triangles
10,859Avanta
Logic
Strings
Algorithms
6 kyu
Multiplication table
40,034Bugari
Arrays
Fundamentals
6 kyu
Encrypt this!
22,602suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
6 kyu
Meeting
20,496g964
Fundamentals
6 kyu
IP Validation
41,814wink
Regular Expressions
Algorithms
6 kyu
Give me a Diamond
36,656jayeshcp
Strings
ASCII Art
Fundamentals
6 kyu
Help the bookseller !
29,287g964
Fundamentals
Algorithms
6 kyu
Reverse or rotate?
23,214g964
Algorithms
Strings
6 kyu
Fold an array
11,052user5036852
Fundamentals
Logic
Mathematics
Algorithms
6 kyu
Pyramid Array
18,555sahglie
Algorithms
6 kyu
Unique In Order
184,534pinelopi
Algorithms
Fundamentals
7 kyu
Building blocks
12,066NaMe613
Object-oriented Programming
Fundamentals
7 kyu
Simple consecutive pairs
10,971KenKamau
Arrays
Fundamentals
7 kyu
Sort by Last Char
9,362PG1
Fundamentals
Strings
Arrays
Sorting
7 kyu
Char Code Calculation
11,546PG1
Fundamentals
Arrays
Strings
Mathematics
7 kyu
Greatest common divisor
17,902RVdeKoning
Algorithms
Fundamentals
Recursion
7 kyu
Ones and Zeros
146,354user4386369
Fundamentals
Arrays
5 kyu
int32 to IPv4
26,432sahglie
Networks
Bits
Algorithms
8 kyu
Square(n) Sum
282,966jhoffner
Arrays
Lists
Fundamentals
5 kyu
Find numbers with 3 divisors
425Anchous
Algorithms
Mathematics
4 kyu
Snail
76,136stevenbarragan
Arrays
Algorithms
6 kyu
Break camelCase
119,446hakt
Strings
Fundamentals
7 kyu
Binary Addition
178,269garrettguy457
Binary
Fundamentals
6 kyu
Matrix Addition
13,521xDranik
Matrix
Arrays
Algorithms
6 kyu
Character with longest consecutive repetition
11,508suic
Strings
Fundamentals
Algorithms
6 kyu
Pair of gloves
14,969AzariasB
Arrays
Puzzles
6 kyu
What century is it?
10,832user1511460
Strings
Algorithms
Date Time
8 kyu
Flick Switch
12,807saudiGuy
Fundamentals
Lists