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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
114cyril-lemaire
Linked Lists
Fundamentals
Algorithms
6 kyu
N smallest elements in original order
2,971GiacomoSorbi
Arrays
Lists
Data Structures
Algorithms
6 kyu
Which are in?
80,890g964
Arrays
Lists
Strings
Refactoring
6 kyu
Vowels Back
1,715PG1
Fundamentals
Strings
Arrays
Algorithms
7 kyu
Numbers to Letters
7,298PG1
Fundamentals
Strings
Arrays
6 kyu
Ease the StockBroker
2,157g964
Fundamentals
Strings
7 kyu
Borrower Speak
3,120PG1
Fundamentals
Strings
6 kyu
Positions Average
3,721g964
Fundamentals
Strings
7 kyu
Basic Math (Add or Subtract)
6,342nza
Strings
Fundamentals
7 kyu
Find the longest gap!
3,092joh_pot
Regular Expressions
Strings
Fundamentals
6 kyu
Longest palindrome
1,399georgesykes86
Arrays
Strings
Algorithms
6 kyu
Errors : histogram
2,446g964
Fundamentals
Strings
6 kyu
Highest Scoring Word
101,945PG1
Fundamentals
Strings
Arrays
7 kyu
String ends with?
237,297jhoffner
Strings
Fundamentals
6 kyu
Consonant value
19,175KenKamau
Strings
Fundamentals
6 kyu
Rainfall
7,829g964
Fundamentals
Strings
7 kyu
Driving Licence
3,522adrian.eyre
Strings
Arrays
Fundamentals
7 kyu
Reverse words
148,336jnicol
Strings
Fundamentals
6 kyu
Encrypt this!
23,022suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
6 kyu
Lottery Ticket
13,369PG1
Fundamentals
Strings
Arrays
6 kyu
Longest Word in Dictionary
153kodejuice
Strings
Algorithms
Data Structures
6 kyu
Prize Draw
7,096g964
Fundamentals
Strings
Sorting
6 kyu
A String of Sorts
1,760Lordnibbler
Strings
Sorting
Algorithms
7 kyu
Sort Out The Men From Boys
10,622MrZizoScream
Fundamentals
Algorithms
Sorting
6 kyu
Salesman's Travel
6,659g964
Fundamentals
Strings
7 kyu
Inspiring Strings
5,761Capocaccia
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?
95mochman
Fundamentals
Regular Expressions
Strings
6 kyu
Music Fun #1 - Major Scale
254smokinhiro
Algorithms
Strings
Parsing
Logic
Fundamentals
6 kyu
Create a frame!
1,493gabrielsiedler
Strings
Arrays
ASCII Art
Fundamentals
6 kyu
Banker's Plan
4,991g964
Mathematics
Algorithms
7 kyu
Form The Minimum
28,158MrZizoScream
Fundamentals
6 kyu
Consecutive strings
80,649g964
Fundamentals
6 kyu
Disease Spread
1,825g964
Fundamentals
7 kyu
Consecutive Digits To Form Sum
2,785MrZizoScream
Fundamentals
Mathematics
Puzzles
6 kyu
Braking well
3,087g964
Fundamentals
Mathematics
6 kyu
Vowel-consonant lexicon
602KenKamau
Strings
Arrays
Algorithms
6 kyu
Pokemon Damage Calculator
4,173yaphi1
Arrays
Games
Strings
Puzzles
7 kyu
Polydivisible Numbers
1,277Luvexina
Algorithms
6 kyu
Look and say sequence generator
852GiacomoSorbi
Strings
Regular Expressions
Fundamentals
6 kyu
Buying a car
18,012g964
Fundamentals
Mathematics
6 kyu
Array Exchange
1,321hafizio
Arrays
Algorithms
Fundamentals
6 kyu
Statistics for an Athletic Association
10,743g964
Fundamentals
Strings
Statistics
Mathematics
Data Science
6 kyu
Sums of Parts
24,976g964
Fundamentals
Performance
Algorithms
7 kyu
Moves in squared strings (I)
13,881g964
Fundamentals
Algorithms
Strings
7 kyu
Sum of powers of 2
1,356atrX
Fundamentals
Algorithms
6 kyu
Equal Sides Of An Array
128,828Shivo
Algorithms
Arrays
Fundamentals
6 kyu
Moves in squared strings (II)
4,990g964
Algorithms
Strings
8 kyu
The 'if' function
33,353user578387
Functional Programming
Fundamentals
6 kyu
The Supermarket Queue
52,656mattlub
Arrays
Fundamentals
6 kyu
Backwards Read Primes
7,383g964
Mathematics
Algorithms
6 kyu
Even Odd Pattern #1
733debri
Logic
Arrays
Mathematics
Puzzles
7 kyu
What dominates your array?
4,530joh_pot
Arrays
Fundamentals
6 kyu
More Zeros than Ones
3,557crimbus
Fundamentals
6 kyu
up AND down
3,049g964
Fundamentals
Strings
7 kyu
Most digits
15,800Gbaja
Strings
Fundamentals
6 kyu
Framed Reflection
2,422PG1
Fundamentals
Strings
Arrays
6 kyu
Parse bank account number
1,213arhigod
Strings
Puzzles
6 kyu
Generic numeric template formatter
1,312GiacomoSorbi
Regular Expressions
Strings
Algorithms
6 kyu
Write Number in Expanded Form - Part 2
2,048Belax8
Mathematics
Algorithms
Fundamentals
6 kyu
Separate The Wheat From The Chaff
1,726MrZizoScream
Fundamentals
Arrays
Performance
6 kyu
Who has the most money?
4,818MrAppa
Object-oriented Programming
Algorithms
Retired
Replacement (retired)
1,060arhigod
Fundamentals
Algorithms
Logic
Arrays
Data Types
7 kyu
GCD sum
3,264KenKamau
Fundamentals
6 kyu
Permute a Palindrome
3,425kgashok
Algorithms
Fundamentals
6 kyu
Simple time difference
1,480KenKamau
Algorithms
Date Time
Strings
7 kyu
Sum of Cubes
22,383MementoMori
Fundamentals
6 kyu
Fixed xor
393user6029333
Algorithms
Mathematics
Logic
Algebra
Binary
Cryptography
6 kyu
FIXME: Hello
2,526dinglemouse
Debugging
6 kyu
Color Choice
3,007g964
Combinatorics
Mathematics
6 kyu
Unwanted dollars
2,114geoffp
Fundamentals
7 kyu
Rotate for a Max
10,913g964
Algorithms
6 kyu
Row of the odd triangle
3,884shikyo
Algorithms
Performance
6 kyu
Shortest steps to a number
3,996bdowds
Puzzles
Mathematics
Fundamentals
Games
6 kyu
Data Reverse
24,697sataman
Arrays
Fundamentals
6 kyu
Vowel Recognition
713sazzadshopno
Algorithms
Performance
7 kyu
Graceful Tipping
1,403viktorostlund
Mathematics
Fundamentals
7 kyu
Search for letters
6,612Roy Gardiner
Strings
Fundamentals
7 kyu
Unique string characters
7,142KenKamau
Strings
Fundamentals
8 kyu
Bin to Decimal
32,789wichu
Binary
Fundamentals
7 kyu
Build a square
19,487Capocaccia
Fundamentals
ASCII Art
7 kyu
Ones and Zeros
148,925user4386369
Fundamentals
Arrays
7 kyu
Delta Bits
3,344ykagan
Bits
Binary
Algorithms
Retired
Tower of Hanoi (retired)
1,244jvmorren
Puzzles
Mathematics
Logic
7 kyu
Even and Odd !
2,271Moss_Von
Fundamentals
8 kyu
Convert to Binary
34,931JapaX
Mathematics
Algorithms
Fundamentals