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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
253,144PG1
Fundamentals
7 kyu
Two to One
179,484g964
Fundamentals
6 kyu
Detect Pangram
196,187anindyabd
Strings
Data Structures
Fundamentals
6 kyu
Equal Sides Of An Array
133,341Shivo
Algorithms
Arrays
Fundamentals
7 kyu
Regex validate PIN code
186,943JMurphyWeb
Regular Expressions
Fundamentals
8 kyu
Century From Year
220,207MrZizoScream
Fundamentals
Mathematics
6 kyu
Sort the odd
114,314fyvfyv
Fundamentals
Arrays
Sorting
6 kyu
Build Tower
106,9348fdafs2
Strings
ASCII Art
Fundamentals
7 kyu
Find the divisors!
89,949kwy95
Mathematics
Algorithms
6 kyu
Highest Scoring Word
106,389PG1
Fundamentals
Strings
Arrays
8 kyu
Array plus array
90,378Dmitry Kudla
Fundamentals
Arrays
Debugging
8 kyu
Total amount of points
117,616petrosernivka
Fundamentals
Arrays
Strings
8 kyu
Sum Mixed Array
107,228PG1
Fundamentals
Strings
Arrays
8 kyu
Quarter of the year
125,525Orses
Fundamentals
Mathematics
7 kyu
Testing 1-2-3
81,298acr
Arrays
Fundamentals
6 kyu
Which are in?
82,813g964
Arrays
Lists
Strings
Refactoring
6 kyu
Shortest steps to a number
4,098bdowds
Puzzles
Mathematics
Fundamentals
Games
6 kyu
Merge in 2048
1,056mrfox
Games
Arrays
Algorithms
7 kyu
Is this a valid Chess960 position?
709LegendaryFartMaster
Fundamentals
Algorithms
Games
Strings
6 kyu
Bishop Movement checker
515user7314902
Games
Mathematics
Algorithms
7 kyu
Block the Square in Tic Tac Toe
239saudiGuy
Games
Logic
Algorithms
6 kyu
Two Sum
88,334wthit56
Arrays
Fundamentals
Algorithms
6 kyu
Write Number in Expanded Form
84,497Belax8
Strings
Mathematics
Algorithms
Fundamentals
6 kyu
Write Number in Expanded Form - Part 2
2,112Belax8
Mathematics
Algorithms
Fundamentals
6 kyu
Mexican Wave
74,445adrian.eyre
Arrays
Strings
Fundamentals
8 kyu
Stringy Strings
39,908andrewMacmurray
Strings
Binary
Algorithms
8 kyu
Well of Ideas - Easy Version
36,468PG1
Fundamentals
Arrays
Strings
Refactoring
7 kyu
Check the exam
33,355Dmitry Kudla
Fundamentals
Arrays
8 kyu
Bin to Decimal
33,892wichu
Binary
Fundamentals
7 kyu
Form The Minimum
29,172MrZizoScream
Fundamentals
7 kyu
Alternate capitalization
34,981KenKamau
Strings
Fundamentals
7 kyu
Flatten and sort an array
30,033lilsweetcaligula
Arrays
Sorting
Fundamentals
7 kyu
Parts of a list
17,962g964
Arrays
Lists
Data Structures
Algorithms
7 kyu
Moves in squared strings (I)
14,160g964
Fundamentals
Algorithms
Strings
7 kyu
Alphabet symmetry
15,309KenKamau
Strings
Fundamentals
7 kyu
Divide and Conquer
16,286PG1
Fundamentals
Strings
Arrays
8 kyu
The 'if' function
34,292user578387
Functional Programming
Fundamentals
7 kyu
Coloured Triangles
11,236Avanta
Logic
Strings
Algorithms
6 kyu
Multiplication table
43,351Bugari
Arrays
Fundamentals
6 kyu
Encrypt this!
23,662suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
6 kyu
Meeting
21,439g964
Fundamentals
6 kyu
IP Validation
44,209wink
Regular Expressions
Algorithms
6 kyu
Give me a Diamond
38,095jayeshcp
Strings
ASCII Art
Fundamentals
6 kyu
Help the bookseller !
31,057g964
Fundamentals
Algorithms
6 kyu
Reverse or rotate?
24,230g964
Algorithms
Strings
6 kyu
Fold an array
11,432user5036852
Fundamentals
Logic
Mathematics
Algorithms
6 kyu
Pyramid Array
19,422sahglie
Algorithms
6 kyu
Unique In Order
194,833pinelopi
Algorithms
Fundamentals
7 kyu
Building blocks
13,271NaMe613
Object-oriented Programming
Fundamentals
7 kyu
Simple consecutive pairs
11,502KenKamau
Arrays
Fundamentals
7 kyu
Sort by Last Char
10,059PG1
Fundamentals
Strings
Arrays
Sorting
7 kyu
Char Code Calculation
12,268PG1
Fundamentals
Arrays
Strings
Mathematics
7 kyu
Greatest common divisor
18,286RVdeKoning
Algorithms
Fundamentals
Recursion
7 kyu
Ones and Zeros
154,162user4386369
Fundamentals
Arrays
7 kyu
Longest vowel chain
10,069KenKamau
Strings
Fundamentals
5 kyu
int32 to IPv4
28,441sahglie
Networks
Bits
Algorithms
8 kyu
Square(n) Sum
305,722jhoffner
Arrays
Lists
Fundamentals
5 kyu
Find numbers with 3 divisors
452Anchous
Algorithms
Mathematics
4 kyu
Snail
80,000stevenbarragan
Arrays
Algorithms
6 kyu
Break camelCase
128,707hakt
Strings
Fundamentals
7 kyu
Binary Addition
190,480garrettguy457
Binary
Fundamentals
6 kyu
Matrix Addition
14,030xDranik
Matrix
Arrays
Algorithms
6 kyu
Character with longest consecutive repetition
11,843suic
Strings
Fundamentals
Algorithms
6 kyu
Pair of gloves
15,352AzariasB
Arrays
Puzzles
6 kyu
What century is it?
11,505user1511460
Strings
Algorithms
Date Time
8 kyu
Flick Switch
14,818saudiGuy
Fundamentals
Lists