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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
Multiples of 3 or 5
424,803jhoffner
Mathematics
Algorithms
7 kyu
List Filtering
283,893cmgerber
Lists
Filtering
Data Structures
Fundamentals
6 kyu
Find The Parity Outlier
215,453obnounce
Algorithms
7 kyu
Two to One
169,788g964
Fundamentals
6 kyu
Multiplication table
40,035Bugari
Arrays
Fundamentals
7 kyu
The Pony Express
3,253dinglemouse
Fundamentals
6 kyu
Build Tower
100,9798fdafs2
Strings
ASCII Art
Fundamentals
6 kyu
Sort the odd
108,192fyvfyv
Fundamentals
Arrays
Sorting
6 kyu
Consecutive strings
79,447g964
Fundamentals
7 kyu
last digits of a number
5,157jonny_boy
Fundamentals
6 kyu
Create Phone Number
332,951xDranik
Arrays
Strings
Regular Expressions
Algorithms
7 kyu
Get the Middle Character
270,725Shivo
Fundamentals
Strings
7 kyu
The Barksdale Code
2,718milesflo
Cryptography
Puzzles
7 kyu
Vowel Count
415,264jayeshcp
Strings
Fundamentals
6 kyu
Bonuses
1,409g964
Fundamentals
7 kyu
Digitize
13,540mcclaskc
Lists
Algorithms
7 kyu
Ones' Complement
2,456marbiru
Fundamentals
6 kyu
Sequences and Series
6,056BattleRattle
Mathematics
Algorithms
Puzzles
6 kyu
Sums of Parts
24,422g964
Fundamentals
Performance
Algorithms
7 kyu
Evens and Odds
6,811ocirion
Fundamentals
Binary
5 kyu
Missing number in Unordered Arithmetic Progression
1,032Hacker Sakana
Algorithms
Mathematics
Performance
4 kyu
Roman Numerals Helper
29,966jhoffner
Algorithms
Object-oriented Programming
4 kyu
Human readable duration format
82,677davazp
Strings
Date Time
Algorithms
7 kyu
Even and Odd !
2,241Moss_Von
Fundamentals
6 kyu
Who likes it?
344,234BattleRattle
Strings
Fundamentals
6 kyu
Split Strings
156,710jhoffner
Regular Expressions
Strings
Algorithms
6 kyu
Change it up
2,676aec58
Strings
Fundamentals
7 kyu
Char Code Calculation
11,546PG1
Fundamentals
Arrays
Strings
Mathematics
7 kyu
Fix string case
31,516KenKamau
Fundamentals
7 kyu
Nth power rules them all!
7,593jayyv
Fundamentals
Mathematics
Algorithms
Algebra
7 kyu
Least Larger
4,123JohanWiltink
Algorithms
Arrays
6 kyu
Clock in Mirror
3,741aryan-firouzian
Fundamentals
7 kyu
The highest profit wins!
97,251bkaes
Lists
Arrays
Fundamentals
7 kyu
Substring fun
4,970philb56
Arrays
Strings
Fundamentals
6 kyu
Detect Pangram
182,895anindyabd
Strings
Data Structures
Fundamentals
6 kyu
Assemble string
1,604kirull
Strings
Arrays
Fundamentals
8 kyu
Powers of 2
65,259wichu
Mathematics
Fundamentals
Retired
Case Swapping (retired)
6,548joh_pot
Fundamentals
7 kyu
Count the Digit
48,239g964
Fundamentals
8 kyu
If you can't sleep, just count sheep!!
123,343joshra
Fundamentals
Strings
5 kyu
String incrementer
48,774parceval
Regular Expressions
Strings
6 kyu
Determine the date by the day number
1,532LarisaOvchinnikova
Fundamentals
Date Time
Algorithms
8 kyu
Convert a string to an array
143,986samjam48
Arrays
Strings
Fundamentals
7 kyu
Digits explosion
17,889angellaa
Strings
Regular Expressions
Fundamentals
8 kyu
Will you make it?
146,456user2514386
Mathematics
Fundamentals
8 kyu
Volume of a Cuboid
109,607user5196477
Geometry
Fundamentals
Mathematics
8 kyu
Sentence Smash
156,859richardhsu
Strings
Arrays
Fundamentals
7 kyu
Age in days
1,447user5266704
Date Time
Fundamentals
7 kyu
Don't give me five!
41,316user5036852
Mathematics
Arrays
Algorithms
7 kyu
"Very Even" Numbers.
3,968realfg
Fundamentals
Mathematics
Algorithms
7 kyu
Remove All The Marked Elements of a List
11,060raulbc777
Fundamentals
Algorithms
Data Structures
7 kyu
Number-Star ladder
5,724m47r1x
ASCII Art
Fundamentals
6 kyu
If you can read this...
12,133henryhamon
Fundamentals
6 kyu
Give me a Diamond
36,656jayeshcp
Strings
ASCII Art
Fundamentals
6 kyu
Array.diff
284,653marcinbunsch
Arrays
Fundamentals
Algorithms
6 kyu
Convert ISBN-10 to ISBN-13
1,097dienesviktor
Algorithms
Regular Expressions
Fundamentals
Strings
6 kyu
Matrix Transpose
7,679osuushi
Mathematics
Algebra
Matrix
Algorithms
6 kyu
Tribonacci Sequence
154,055GiacomoSorbi
Number Theory
Arrays
Lists
Fundamentals
6 kyu
Fibonacci, Tribonacci and friends
13,246GiacomoSorbi
Arrays
Lists
Number Theory
Fundamentals
6 kyu
IP Validation
41,814wink
Regular Expressions
Algorithms
6 kyu
IP Address to Number
1,990user5854572
Strings
Binary
Networks
Fundamentals
6 kyu
What century is it?
10,832user1511460
Strings
Algorithms
Date Time
6 kyu
Arabian String
2,565dacoxall
Strings
Algorithms
6 kyu
Calculate String Rotation
7,300obnounce
Strings
Arrays
Algorithms
5 kyu
ROT13
26,075hvaara
Strings
Ciphers
Regular Expressions
Algorithms
5 kyu
RGB To Hex Conversion
132,958jhoffner
Algorithms
6 kyu
Odd-heavy Array
2,321aweleshetu
Arrays
Fundamentals
5 kyu
Count IP Addresses
28,423xDranik
Algorithms
5 kyu
ISBN-10 Validation
10,487nklein
Regular Expressions
Algorithms
5 kyu
Ant Bridge
529dinglemouse
Algorithms
4 kyu
Strip Comments
52,566jhoffner
Strings
Algorithms
5 kyu
Beeramid
17,756kylehill
Mathematics
Algorithms
7 kyu
Exes and Ohs
252,456joh_pot
Fundamentals
7 kyu
Survive the attack
2,447EvaRD
Arrays
7 kyu
Hex Hash Sum
2,076Hoff Starr
Mathematics
Security
Fundamentals
6 kyu
More Zeros than Ones
3,502crimbus
Fundamentals
7 kyu
Shortest Word
240,908PG1
Fundamentals
7 kyu
Compress sentences
1,265mikeos
Lists
Algorithms
7 kyu
How Many Unique Consonants?
3,191l-suzuki
Strings
Fundamentals
Algorithms
6 kyu
Remove the parentheses
6,798topping
Strings
Algorithms
Regular Expressions
Fundamentals
6 kyu
Highest Scoring Word
100,006PG1
Fundamentals
Strings
Arrays
7 kyu
How Green Is My Valley?
5,200g964
Fundamentals
7 kyu
Count consonants
8,105bitfragment
Strings
Fundamentals
7 kyu
Binary Addition
178,270garrettguy457
Binary
Fundamentals
6 kyu
Tortoise racing
31,829g964
Fundamentals
Mathematics
Algorithms
7 kyu
Interlocking Binary Pairs
2,461rowcased
Binary
Bits
Algorithms
8 kyu
Reversed Words
86,064jhoffner
Strings
Algorithms
6 kyu
Lottery Ticket
13,233PG1
Fundamentals
Strings
Arrays
7 kyu
Square Every Digit
314,325MysteriousMagenta
Mathematics
Fundamentals