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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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5 kyu
Regex for Gregorian date validation
271kolichj
Strings
Regular Expressions
Fundamentals
Retired
Double Cola (retired)
14,993AlexIsHappy
Algorithms
Mathematics
Logic
Numbers
6 kyu
Ticker
615nesusvet
Fundamentals
6 kyu
Get a User's Honor
319user2514386
Strings
Regular Expressions
Fundamentals
4 kyu
Codewars style ranking system
16,328jhoffner
Algorithms
Object-oriented Programming
6 kyu
Add commas to a number
779tdowek1
Regular Expressions
Fundamentals
3 kyu
Sudoku Solver
13,340pineappleclock
Games
Game Solvers
Algorithms
5 kyu
Transposing Guitar Tabs
57tommyhyatt
Arrays
Algorithms
4 kyu
How many numbers III?
3,831raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
4 kyu
Roman Numerals Helper
28,494jhoffner
Algorithms
Object-oriented Programming
5 kyu
Return substring instance count - 2
2,982ineiti
Strings
Regular Expressions
Algorithms
5 kyu
Morse Encoding
1,224constablebrew
Bits
Strings
Binary
Parsing
Algorithms
5 kyu
Binary search tree validation
943plastic
Trees
Recursion
Data Structures
Algorithms
7 kyu
Greatest common divisor
17,705RVdeKoning
Algorithms
Fundamentals
Recursion
5 kyu
Alphabet wars - nuclear strike
1,623dcieslak
Strings
Regular Expressions
Fundamentals
6 kyu
Zeros and Ones
774kodejuice
Puzzles
Logic
Algorithms
5 kyu
Complete Binary Tree
439ecolban
Binary Trees
Heaps
Data Structures
Fundamentals
5 kyu
Binary Search Trees
596ecolban
Object-oriented Programming
Algorithms
Data Structures
6 kyu
Number Zoo Patrol
5,731shawkinsl
Algorithms
Performance
Mathematics
6 kyu
Build a Trie
397suic
Data Structures
Fundamentals
4 kyu
Snail
73,215stevenbarragan
Arrays
Algorithms
3 kyu
Alphabetic Anagrams
6,011Azuaron
Mathematics
Logic
Strings
Algorithms
4 kyu
Egg Drops
95ecolban
Recursion
Dynamic Programming
Puzzles
5 kyu
Data mining #1
381smiks
Mathematics
Machine Learning
Algorithms
Data Science
5 kyu
Josephus Permutation
15,144GiacomoSorbi
Mathematics
Permutations
Algorithms
Combinatorics
4 kyu
Count ones in a segment
2,976d0n14
Binary
Performance
Algorithms
4 kyu
Most frequently used words in a text
26,820markprzepiora
Strings
Filtering
Algorithms
Regular Expressions
4 kyu
Sum of Intervals
37,145xDranik
Algorithms
Performance
5 kyu
Calculating with Functions
78,940BattleRattle
Functional Programming
4 kyu
Count Squares In the Chess Board
299myjinxin2015
Algorithms
Dynamic Programming
5 kyu
Largest rectangle in background
201ecolban
Algorithms
Fundamentals
5 kyu
Count IP Addresses
26,964xDranik
Algorithms
4 kyu
IPv6 address validation and contraction
157MindWanderer
Algorithms
Fundamentals
Regular Expressions
Strings
5 kyu
Convert all the cases!
1,382AJFarmar
Strings
Regular Expressions
Algorithms
5 kyu
Max sum path
187sid114
Arrays
Fundamentals
3 kyu
Make a spiral
14,098Bugari
Algorithms
Arrays
Logic
4 kyu
Simple maze
820eugene-katsevman
Queues
Recursion
Algorithms
3 kyu
Find the cheapest path
524FArekkusu
Algorithms
Performance
6 kyu
Hanoi record
2,863Bugari
Fundamentals
Algorithms
Mathematics
Puzzles
4 kyu
Balanced parentheses string
101ecolban
Algorithms
Dynamic Programming
3 kyu
Fabergé Easter Eggs crush test
1,752Ivana
Mathematics
Dynamic Programming
Performance
Algorithms