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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
1,550tiriana
Puzzles
Logic
Riddles
5 kyu
Find heavy ball - level: master
1,757tiriana
Puzzles
Logic
Riddles
7 kyu
Binary Addition
190,453garrettguy457
Binary
Fundamentals
7 kyu
Replace every nth
4,701user5036852
Algorithms
Strings
Retired
Did I Finish my Sudoku? (retired)
15,659suuuzi
Mathematics
Puzzles
Games
Game Solvers
6 kyu
Utf-8: Binary Encoding
105chivery
Unicode
Strings
7 kyu
KanaKonverter I
217Kaiyou
Fundamentals
8 kyu
Is there a vowel in there?
17,014PG1
Fundamentals
Strings
Arrays
6 kyu
Closest String
63QKiryu
Algorithms
6 kyu
Smart Traffic Lights
1,157user2514386
Fundamentals
Object-oriented Programming
8 kyu
Will you make it?
158,158user2514386
Mathematics
Fundamentals
7 kyu
Make a square box!
2,112user2514386
Strings
Arrays
ASCII Art
Algorithms
6 kyu
Loose Change
6,052ghost_pilot
Mathematics
Fundamentals
6 kyu
Esolang: MiniBitMove
996user2514386
Interpreters
Strings
Arrays
Bits
Esoteric Languages
Fundamentals
7 kyu
21 Sticks
2,158user2514386
Games
Algorithms
Mathematics
Game Solvers
6 kyu
Esolang: Tick
941user2514386
Esoteric Languages
Interpreters
Strings
Arrays
Fundamentals
7 kyu
More than Zero?
2,828ethanhan2013
Debugging
7 kyu
Get the Middle Character
284,420Shivo
Fundamentals
Strings
7 kyu
Fizz Buzz
26,487stephenyu
Algorithms
Fundamentals
Arrays
6 kyu
Number Format
3,363cnawaraj
Regular Expressions
Fundamentals
6 kyu
Clock in Mirror
3,824aryan-firouzian
Fundamentals
7 kyu
Candy problem
5,529JustyFY
Lists
Algorithms
Draft
Tug-o'-War
1,680edm2410
Status:Draft
Estimated Rank:
7 kyu
Arrays
Fundamentals
7 kyu
Name Array Capping
9,518ogryzek
Strings
Arrays
Fundamentals
8 kyu
Fake Binary
156,477PG1
Fundamentals
Strings
Arrays
6 kyu
Detect Pangram
196,149anindyabd
Strings
Data Structures
Fundamentals
8 kyu
Counting sheep...
280,189tfKamran
Arrays
Fundamentals
7 kyu
Leap Years
42,062BattleRattle
Date Time
Algorithms
7 kyu
Naughty or Nice?
1,876user2514386
Mathematics
Fundamentals
7 kyu
Area of a Circle
12,399austinc
Fundamentals
Algorithms
Geometry
Mathematics
7 kyu
How much will you spend?
1,217user2514386
Mathematics
Algorithms
6 kyu
The Vowel Code
22,311yaphi1
Arrays
Strings
Regular Expressions
Fundamentals
5 kyu
Morse Encoding
1,241constablebrew
Bits
Strings
Binary
Parsing
Algorithms
7 kyu
Which color is the brightest?
5,734avermakov
Algorithms
Strings
3 kyu
Minimal Cost Binary Search Trees
99ecolban
Algorithms
Binary Search Trees
Fundamentals
7 kyu
Coloured Triangles
11,236Avanta
Logic
Strings
Algorithms
4 kyu
Mystery Function
2,264ecolban
Fundamentals
6 kyu
Backspaces in string
19,237vetalpaprotsky
Fundamentals
Strings
Algorithms
7 kyu
Adding Arrays
2,931K-Calderon-ASC
Fundamentals
6 kyu
The takeWhile Function
2,462jgdodson
Functional Programming
Arrays
Algorithms
Lists
Data Structures
7 kyu
All unique
12,962pinelopi
Algorithms
Strings
7 kyu
Sum of all arguments
12,408user578387
Fundamentals
6 kyu
Duplicate Encoder
233,475obnounce
Strings
Arrays
Fundamentals
Beta
Robust hangman
24davilla
Status:Waiting for issues to be resolved
Fundamentals
7 kyu
Reverse words
155,735jnicol
Strings
Fundamentals
6 kyu
Bouncing Balls
94,094g964
Puzzles
Algorithms
Mathematics
8 kyu
Reversed Strings
380,914jhoffner
Strings
Fundamentals
8 kyu
Beginner - Reduce but Grow
169,333PG1
Fundamentals
Arrays
Retired
N-th Power (retired)
35,399Milford
Fundamentals
Arrays
8 kyu
Find the position!
31,555iamchingel
Fundamentals
8 kyu
Playing with cubes II
8,893Jotha
Fundamentals
Object-oriented Programming
8 kyu
CSV representation of array
20,004Dmitry Kudla
Fundamentals
Arrays
Strings
8 kyu
L1: Set Alarm
109,309Swolebrain
Fundamentals
Logic
8 kyu
Regexp Basics - is it a digit?
18,308taw
Regular Expressions
Fundamentals
8 kyu
Compare within margin
15,936ITSOES
Fundamentals
Logic
8 kyu
Total amount of points
117,602petrosernivka
Fundamentals
Arrays
Strings
8 kyu
A wolf in sheep's clothing
37,108jkempster34
Fundamentals
Arrays
8 kyu
Pillars
28,266petrosernivka
Fundamentals
Mathematics
8 kyu
Enumerable Magic #20 - Cascading Subsets
9,009bellmyer
Fundamentals
Lists
Data Structures
Arrays
Algorithms
8 kyu
Bin to Decimal
33,885wichu
Binary
Fundamentals
8 kyu
OOP: Object Oriented Piracy
21,730By-The-Ocean
Object-oriented Programming
Fundamentals
8 kyu
Holiday VI - Shark Pontoon
18,169PG1
Fundamentals
Mathematics
3 kyu
The Lift
3,478dinglemouse
Algorithms
Queues
Data Structures
4 kyu
Sum of Intervals
40,717xDranik
Algorithms
Performance
6 kyu
Pascal's Triangle
11,695boatmeme
Arrays
Mathematics
Algorithms
5 kyu
Land perimeter
5,034St3f4n
Fundamentals
6 kyu
Square string tops
336dcieslak
Fundamentals
Strings
7 kyu
Factorial
29,879wichu
Fundamentals
6 kyu
Custom sort function
1,255lunitik
Sorting
Arrays
Algorithms
Restricted
5 kyu
Binary Tree Traversal
2,276Ban-Ath
Binary Trees
Trees
Recursion
Data Structures
Algorithms