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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
Find heavy ball - level: novice
1,488tiriana
Puzzles
Logic
Riddles
5 kyu
Find heavy ball - level: master
1,700tiriana
Puzzles
Logic
Riddles
7 kyu
Binary Addition
164,844garrettguy457
Binary
Fundamentals
Retired
Did I Finish my Sudoku? (retired)
15,659suuuzi
Mathematics
Puzzles
Games
Game Solvers
6 kyu
Utf-8: Binary Encoding
99chivery
Unicode
Strings
Algorithms
7 kyu
KanaKonverter I
189Kaiyou
Fundamentals
8 kyu
Is there a vowel in there?
13,000PG1
Fundamentals
Strings
Arrays
6 kyu
Closest String
58QKiryu
Algorithms
6 kyu
Smart Traffic Lights
619user2514386
Fundamentals
Object-oriented Programming
8 kyu
Will you make it?
127,321user2514386
Mathematics
Fundamentals
7 kyu
Make a square box!
1,654user2514386
Strings
Arrays
ASCII Art
Algorithms
6 kyu
Loose Change
5,411ghost_pilot
Mathematics
Fundamentals
6 kyu
Esolang: MiniBitMove
907user2514386
Interpreters
Strings
Arrays
Bits
Esoteric Languages
Fundamentals
7 kyu
21 Sticks
2,032user2514386
Games
Algorithms
Mathematics
Game Solvers
6 kyu
Esolang: Tick
862user2514386
Esoteric Languages
Interpreters
Strings
Arrays
Fundamentals
7 kyu
More than Zero?
2,169ethanhan2013
Debugging
7 kyu
Get the Middle Character
254,589Shivo
Fundamentals
Strings
7 kyu
Fizz Buzz
24,710stephenyu
Algorithms
Fundamentals
Arrays
6 kyu
Number Format
2,961cnawaraj
Regular Expressions
Fundamentals
6 kyu
Clock in Mirror
3,650aryan-firouzian
Fundamentals
7 kyu
Candy problem
5,251JustyFY
Lists
Algorithms
Draft
Tug-o'-War
1,680edm2410
Status:Draft
Estimated Rank:
7 kyu
Arrays
Fundamentals
7 kyu
Name Array Capping
7,352ogryzek
Strings
Arrays
Fundamentals
8 kyu
Fake Binary
130,159PG1
Fundamentals
Strings
Arrays
6 kyu
Detect Pangram
167,944anindyabd
Strings
Data Structures
Fundamentals
8 kyu
Counting sheep...
237,586tfKamran
Arrays
Fundamentals
7 kyu
Leap Years
36,388BattleRattle
Date Time
Algorithms
7 kyu
Naughty or Nice?
1,666user2514386
Mathematics
Fundamentals
7 kyu
Area of a Circle
11,641austinc
Fundamentals
Algorithms
Geometry
Mathematics
7 kyu
How much will you spend?
1,047user2514386
Mathematics
Algorithms
6 kyu
The Vowel Code
17,993yaphi1
Arrays
Strings
Regular Expressions
Fundamentals
5 kyu
Morse Encoding
1,219constablebrew
Bits
Strings
Binary
Parsing
Algorithms
7 kyu
Which color is the brightest?
5,611avermakov
Algorithms
Strings
3 kyu
Minimal Cost Binary Search Trees
74ecolban
Algorithms
Binary Search Trees
Fundamentals
7 kyu
Coloured Triangles
10,463Avanta
Logic
Strings
Algorithms
4 kyu
Mystery Function
1,890ecolban
Fundamentals
6 kyu
Backspaces in string
17,513vetalpaprotsky
Fundamentals
Strings
Algorithms
7 kyu
Adding Arrays
2,700K-Calderon-ASC
Fundamentals
6 kyu
The takeWhile Function
2,306jgdodson
Functional Programming
Arrays
Algorithms
Lists
Data Structures
7 kyu
All unique
11,521pinelopi
Algorithms
Strings
6 kyu
Even Fibonacci Sum
2,968krillgar
Algorithms
7 kyu
Sum of all arguments
11,277user578387
Fundamentals
6 kyu
Duplicate Encoder
206,753obnounce
Strings
Arrays
Fundamentals
Beta
Robust hangman
22davilla
Status:Waiting for issues to be resolved
Fundamentals
7 kyu
Reverse words
131,011jnicol
Strings
Fundamentals
6 kyu
Bouncing Balls
84,586g964
Puzzles
Algorithms
Mathematics
6 kyu
Find Numbers with Same Amount of Divisors
710raulbc777
Algorithms
Mathematics
Data Structures
Fundamentals
8 kyu
Reversed Strings
323,053jhoffner
Strings
Fundamentals
Retired
N-th Power (retired)
35,399Milford
Fundamentals
Arrays
8 kyu
Find the position!
25,748iamchingel
Fundamentals
8 kyu
Playing with cubes II
7,210Jotha
Fundamentals
Object-oriented Programming
8 kyu
CSV representation of array
16,822Dmitry Kudla
Fundamentals
Arrays
Strings
8 kyu
L1: Set Alarm
90,592Swolebrain
Fundamentals
Logic
8 kyu
Regexp Basics - is it a digit?
15,467taw
Regular Expressions
Fundamentals
8 kyu
Compare within margin
14,173ITSOES
Fundamentals
Logic
8 kyu
Total amount of points
98,592petrosernivka
Fundamentals
Arrays
Strings
8 kyu
Pillars
25,293petrosernivka
Fundamentals
Mathematics
8 kyu
Enumerable Magic #20 - Cascading Subsets
7,405bellmyer
Fundamentals
Lists
Data Structures
Arrays
Algorithms
8 kyu
Bin to Decimal
29,945wichu
Binary
Fundamentals
8 kyu
OOP: Object Oriented Piracy
18,530By-The-Ocean
Object-oriented Programming
Fundamentals
8 kyu
Holiday VI - Shark Pontoon
16,466PG1
Fundamentals
Mathematics
3 kyu
The Lift
3,109dinglemouse
Algorithms
Queues
Data Structures
4 kyu
Sum of Intervals
36,089xDranik
Algorithms
Performance
6 kyu
Pascal's Triangle
11,351boatmeme
Arrays
Mathematics
Algorithms
5 kyu
Land perimeter
4,690St3f4n
Fundamentals
6 kyu
Square string tops
255dcieslak
Fundamentals
Strings
7 kyu
Factorial
24,400wichu
Fundamentals
6 kyu
Custom sort function
1,195lunitik
Sorting
Arrays
Algorithms
Restricted
5 kyu
Binary Tree Traversal
1,815Ban-Ath
Binary Trees
Trees
Recursion
Data Structures
Algorithms