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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
242,543PG1
Fundamentals
7 kyu
Two to One
171,135g964
Fundamentals
6 kyu
Detect Pangram
184,606anindyabd
Strings
Data Structures
Fundamentals
6 kyu
Equal Sides Of An Array
127,488Shivo
Algorithms
Arrays
Fundamentals
7 kyu
Regex validate PIN code
177,309JMurphyWeb
Regular Expressions
Fundamentals
8 kyu
Century From Year
206,666MrZizoScream
Fundamentals
Mathematics
6 kyu
Sort the odd
109,006fyvfyv
Fundamentals
Arrays
Sorting
6 kyu
Build Tower
101,8378fdafs2
Strings
ASCII Art
Fundamentals
7 kyu
Find the divisors!
87,994kwy95
Mathematics
Algorithms
6 kyu
Highest Scoring Word
100,811PG1
Fundamentals
Strings
Arrays
8 kyu
Array plus array
87,148Dmitry Kudla
Fundamentals
Arrays
Debugging
8 kyu
Total amount of points
110,850petrosernivka
Fundamentals
Arrays
Strings
8 kyu
Sum Mixed Array
100,588PG1
Fundamentals
Strings
Arrays
8 kyu
Quarter of the year
118,262Orses
Fundamentals
Mathematics
7 kyu
Testing 1-2-3
76,270acr
Arrays
Fundamentals
6 kyu
Which are in?
80,294g964
Arrays
Lists
Strings
Refactoring
6 kyu
Shortest steps to a number
3,962bdowds
Puzzles
Mathematics
Fundamentals
Games
6 kyu
Merge in 2048
899mrfox
Games
Arrays
Algorithms
7 kyu
Is this a valid Chess960 position?
670LegendaryFartMaster
Fundamentals
Algorithms
Games
Strings
6 kyu
Bishop Movement checker
508user7314902
Games
Mathematics
Algorithms
7 kyu
Block the Square in Tic Tac Toe
228saudiGuy
Games
Logic
Algorithms
6 kyu
Two Sum
82,786wthit56
Arrays
Fundamentals
Algorithms
6 kyu
Write Number in Expanded Form
80,862Belax8
Strings
Mathematics
Algorithms
Fundamentals
6 kyu
Write Number in Expanded Form - Part 2
2,012Belax8
Mathematics
Algorithms
Fundamentals
6 kyu
Mexican Wave
69,941adrian.eyre
Arrays
Strings
Fundamentals
8 kyu
Stringy Strings
38,874andrewMacmurray
Strings
Binary
Algorithms
8 kyu
Well of Ideas - Easy Version
35,632PG1
Fundamentals
Arrays
Strings
Refactoring
7 kyu
Check the exam
31,804Dmitry Kudla
Fundamentals
Arrays
8 kyu
Bin to Decimal
32,422wichu
Binary
Fundamentals
7 kyu
Form The Minimum
27,828MrZizoScream
Fundamentals
7 kyu
Alternate capitalization
33,148KenKamau
Strings
Fundamentals
7 kyu
Flatten and sort an array
28,617lilsweetcaligula
Arrays
Sorting
Fundamentals
7 kyu
Parts of a list
16,948g964
Arrays
Lists
Data Structures
Algorithms
7 kyu
Moves in squared strings (I)
13,501g964
Fundamentals
Algorithms
Strings
7 kyu
Alphabet symmetry
14,400KenKamau
Strings
Fundamentals
7 kyu
Divide and Conquer
15,727PG1
Fundamentals
Strings
Arrays
8 kyu
The 'if' function
33,053user578387
Functional Programming
Fundamentals
7 kyu
Coloured Triangles
10,910Avanta
Logic
Strings
Algorithms
6 kyu
Multiplication table
40,525Bugari
Arrays
Fundamentals
6 kyu
Encrypt this!
22,822suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
6 kyu
Meeting
20,719g964
Fundamentals
6 kyu
IP Validation
42,099wink
Regular Expressions
Algorithms
6 kyu
Give me a Diamond
36,867jayeshcp
Strings
ASCII Art
Fundamentals
6 kyu
Help the bookseller !
29,689g964
Fundamentals
Algorithms
6 kyu
Reverse or rotate?
23,491g964
Algorithms
Strings
6 kyu
Fold an array
11,193user5036852
Fundamentals
Logic
Mathematics
Algorithms
6 kyu
Pyramid Array
18,767sahglie
Algorithms
6 kyu
Unique In Order
185,880pinelopi
Algorithms
Fundamentals
7 kyu
Building blocks
12,216NaMe613
Object-oriented Programming
Fundamentals
7 kyu
Simple consecutive pairs
11,026KenKamau
Arrays
Fundamentals
7 kyu
Sort by Last Char
9,427PG1
Fundamentals
Strings
Arrays
Sorting
7 kyu
Char Code Calculation
11,689PG1
Fundamentals
Arrays
Strings
Mathematics
7 kyu
Greatest common divisor
17,974RVdeKoning
Algorithms
Fundamentals
Recursion
7 kyu
Ones and Zeros
147,400user4386369
Fundamentals
Arrays
5 kyu
int32 to IPv4
26,761sahglie
Networks
Bits
Algorithms
8 kyu
Square(n) Sum
286,074jhoffner
Arrays
Lists
Fundamentals
5 kyu
Find numbers with 3 divisors
429Anchous
Algorithms
Mathematics
4 kyu
Snail
76,697stevenbarragan
Arrays
Algorithms
6 kyu
Break camelCase
120,694hakt
Strings
Fundamentals
7 kyu
Binary Addition
179,875garrettguy457
Binary
Fundamentals
6 kyu
Matrix Addition
13,662xDranik
Matrix
Arrays
Algorithms
6 kyu
Character with longest consecutive repetition
11,630suic
Strings
Fundamentals
Algorithms
6 kyu
Pair of gloves
15,100AzariasB
Arrays
Puzzles
6 kyu
What century is it?
11,191user1511460
Strings
Algorithms
Date Time
8 kyu
Flick Switch
13,106saudiGuy
Fundamentals
Lists