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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
Singly Linked List - Swap Nodes
112cyril-lemaire
Linked Lists
Fundamentals
Algorithms
6 kyu
N smallest elements in original order
2,833GiacomoSorbi
Arrays
Lists
Data Structures
Algorithms
6 kyu
Which are in?
78,989g964
Arrays
Lists
Strings
Refactoring
6 kyu
Vowels Back
1,696PG1
Fundamentals
Strings
Arrays
Algorithms
7 kyu
Numbers to Letters
7,002PG1
Fundamentals
Strings
Arrays
6 kyu
Ease the StockBroker
2,129g964
Fundamentals
Strings
7 kyu
Borrower Speak
3,002PG1
Fundamentals
Strings
6 kyu
Positions Average
3,681g964
Fundamentals
Strings
7 kyu
Basic Math (Add or Subtract)
6,153nza
Strings
Fundamentals
7 kyu
Find the longest gap!
3,019joh_pot
Regular Expressions
Strings
Fundamentals
6 kyu
Longest palindrome
1,262georgesykes86
Arrays
Strings
Algorithms
6 kyu
Errors : histogram
2,393g964
Fundamentals
Strings
6 kyu
Highest Scoring Word
98,320PG1
Fundamentals
Strings
Arrays
7 kyu
String ends with?
224,196jhoffner
Strings
Fundamentals
6 kyu
Consonant value
18,156KenKamau
Strings
Fundamentals
6 kyu
Rainfall
7,692g964
Fundamentals
Strings
7 kyu
Driving Licence
3,408adrian.eyre
Strings
Arrays
Fundamentals
7 kyu
Reverse words
140,542jnicol
Strings
Fundamentals
6 kyu
Encrypt this!
22,331suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
6 kyu
Lottery Ticket
12,940PG1
Fundamentals
Strings
Arrays
6 kyu
Longest Word in Dictionary
150kodejuice
Strings
Algorithms
Data Structures
6 kyu
Prize Draw
6,946g964
Fundamentals
Strings
Sorting
6 kyu
A String of Sorts
1,736Lordnibbler
Strings
Sorting
Algorithms
7 kyu
Sort Out The Men From Boys
10,270MrZizoScream
Fundamentals
Algorithms
Sorting
6 kyu
Salesman's Travel
6,536g964
Fundamentals
Strings
7 kyu
Inspiring Strings
5,199Capocaccia
Strings
Fundamentals
Retired
Reverse Letters in Sentence (retired)
2,812Rastalamm
Fundamentals
Loops
Control Flow
Basic Language Features
Strings
Data Types
6 kyu
How much Wood?
93mochman
Fundamentals
Regular Expressions
Strings
6 kyu
Music Fun #1 - Major Scale
251smokinhiro
Algorithms
Strings
Parsing
Logic
Fundamentals
6 kyu
Create a frame!
1,446gabrielsiedler
Strings
Arrays
ASCII Art
Fundamentals
6 kyu
Banker's Plan
4,731g964
Mathematics
Algorithms
6 kyu
Consecutive strings
78,348g964
Fundamentals
6 kyu
Disease Spread
1,795g964
Fundamentals
7 kyu
Consecutive Digits To Form Sum
2,667MrZizoScream
Fundamentals
Mathematics
Puzzles
6 kyu
Braking well
3,052g964
Fundamentals
Mathematics
6 kyu
Vowel-consonant lexicon
597KenKamau
Strings
Arrays
Algorithms
6 kyu
Pokemon Damage Calculator
4,086yaphi1
Arrays
Games
Strings
Puzzles
7 kyu
Polydivisible Numbers
1,248Luvexina
Algorithms
6 kyu
Look and say sequence generator
799GiacomoSorbi
Strings
Regular Expressions
Fundamentals
6 kyu
Buying a car
17,773g964
Fundamentals
Mathematics
6 kyu
Array Exchange
1,300hafizio
Arrays
Algorithms
Fundamentals
6 kyu
Statistics for an Athletic Association
10,272g964
Fundamentals
Strings
Statistics
Mathematics
Data Science
6 kyu
Sums of Parts
24,219g964
Fundamentals
Performance
Algorithms
7 kyu
Moves in squared strings (I)
13,297g964
Fundamentals
Algorithms
Strings
7 kyu
Sum of powers of 2
1,302atrX
Fundamentals
Algorithms
6 kyu
Equal Sides Of An Array
124,856Shivo
Algorithms
Arrays
Fundamentals
8 kyu
The 'if' function
32,207user578387
Functional Programming
Fundamentals
6 kyu
The Supermarket Queue
50,696mattlub
Arrays
Fundamentals
6 kyu
Backwards Read Primes
7,267g964
Mathematics
Algorithms
6 kyu
Even Odd Pattern #1
716debri
Logic
Arrays
Mathematics
Puzzles
7 kyu
What dominates your array?
4,371joh_pot
Arrays
Fundamentals
6 kyu
More Zeros than Ones
3,470crimbus
Fundamentals
6 kyu
up AND down
3,016g964
Fundamentals
Strings
7 kyu
Most digits
15,329Gbaja
Strings
Fundamentals
6 kyu
Framed Reflection
2,380PG1
Fundamentals
Strings
Arrays
6 kyu
Parse bank account number
1,197arhigod
Strings
Puzzles
6 kyu
Generic numeric template formatter
1,292GiacomoSorbi
Regular Expressions
Strings
Algorithms
6 kyu
Write Number in Expanded Form - Part 2
1,953Belax8
Mathematics
Algorithms
Fundamentals
6 kyu
Separate The Wheat From The Chaff
1,705MrZizoScream
Fundamentals
Arrays
Performance
6 kyu
Who has the most money?
4,707MrAppa
Object-oriented Programming
Algorithms
Retired
Replacement (retired)
1,060arhigod
Fundamentals
Algorithms
Logic
Arrays
Data Types
7 kyu
GCD sum
3,184KenKamau
Fundamentals
6 kyu
Permute a Palindrome
3,341kgashok
Algorithms
Fundamentals
6 kyu
Simple time difference
1,435KenKamau
Algorithms
Date Time
Strings
7 kyu
Sum of Cubes
21,206MementoMori
Fundamentals
6 kyu
Fixed xor
383user6029333
Algorithms
Mathematics
Logic
Algebra
Binary
Cryptography
6 kyu
FIXME: Hello
2,059dinglemouse
Debugging
6 kyu
Color Choice
2,961g964
Combinatorics
Mathematics
6 kyu
Unwanted dollars
2,090geoffp
Fundamentals
7 kyu
Rotate for a Max
10,707g964
Algorithms
6 kyu
Row of the odd triangle
3,783shikyo
Algorithms
Performance
6 kyu
Shortest steps to a number
3,673bdowds
Puzzles
Mathematics
Fundamentals
Games
6 kyu
Data Reverse
23,913sataman
Arrays
Fundamentals
6 kyu
Vowel Recognition
704sazzadshopno
Algorithms
Performance
7 kyu
Graceful Tipping
1,390viktorostlund
Mathematics
Fundamentals
7 kyu
Search for letters
6,184Roy Gardiner
Strings
Fundamentals
7 kyu
Unique string characters
6,975KenKamau
Strings
Fundamentals
8 kyu
Bin to Decimal
31,569wichu
Binary
Fundamentals
7 kyu
Build a square
18,615Capocaccia
Fundamentals
ASCII Art
7 kyu
Ones and Zeros
144,087user4386369
Fundamentals
Arrays
7 kyu
Delta Bits
3,234ykagan
Bits
Binary
Algorithms
Retired
Tower of Hanoi (retired)
1,244jvmorren
Puzzles
Mathematics
Logic
7 kyu
Even and Odd !
2,220Moss_Von
Fundamentals
8 kyu
Convert to Binary
33,447JapaX
Mathematics
Algorithms
Fundamentals