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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
Playing with laziness
247phaul
Fundamentals
1 kyu
Lensmaker
380tel
Fundamentals
Functional Programming
Puzzles
1 kyu
Peano and Church
321lolisa
Fundamentals
3 kyu
Isomorphism
895lolisa
Functional Programming
Fundamentals
2 kyu
Algebraic Isomorphism
530lolisa
Functional Programming
Fundamentals
Tutorials
2 kyu
I love Lisp
149ice1000
Mathematics
Fundamentals
Puzzles
Beta
Minimal Squarewave PCM Synthesizer
8benzrf
Status:Testing & feedback needed
Estimated Rank:
2 kyu
Algorithms
Beta
Generalizing the N-Queens problem
6cacr
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Puzzles
Beta
Auto program generation
6surtich
Status:Testing & feedback needed
Algorithms
4 kyu
Brace expansion
138arhigod
Strings
Algorithms
2 kyu
Simple SQL Engine
493SteveRuble
SQL
Parsing
Sets
Databases
Algorithms
2 kyu
Regular expression parser
1,020phaul
Parsing
Functional Programming
Algorithms
1 kyu
Scott Encoding
598xenoexplorator
Functional Programming
Fundamentals
6 kyu
I Liked the SQL Better...
1,096xcthulhu
SQL
Databases
Fundamentals
5 kyu
Peano numbers
413jariazavalverde
Data Structures
Algorithms
6 kyu
Taylor Series
67Paul Robertson
Mathematics
Lists
Fundamentals
4 kyu
Fix it
548gans
Fundamentals
2 kyu
Singletons
450mpickering
Fundamentals
2 kyu
Finally tagless interpreter
304tel
Interpreters
Algorithms
3 kyu
Lens Apprentice
237glebec
Functional Programming
Fundamentals
Tutorials
2 kyu
Yoneda lemma
175pier-bezuhoff
Mathematics
Fundamentals
Beta
Find The Poisoned Apple
62golionko
Status:Waiting for issues to be resolved
Estimated Rank:
7 kyu
Fundamentals
Retired
Flatten a tree (retired)
136lolisa
Status:Retired
Functional Programming
Data Structures
Fundamentals
4 kyu
Template Haskell: Tuple maker
134AJFarmar
Metaprogramming
Fundamentals
6 kyu
Highest Scoring Word
100,015PG1
Fundamentals
Strings
Arrays
6 kyu
Binary Tree Top Line
97KacperKorban
Binary Trees
Fundamentals
4 kyu
Functional streams
739muesli4
Streams
Functional Programming
Algorithms
6 kyu
Reusable memoisation
2,648JohanWiltink
Functional Programming
Recursion
Algorithms
3 kyu
Data Types à la Carte [fork]
183lolisa
Fundamentals
Functional Programming
Puzzles
3 kyu
Data Types à la Carte
360mpickering
Functional Programming
Fundamentals
5 kyu
Shortest list, lazily
128matthewmoppett
Lists
Fundamentals
Retired
Fixing through a folded point (retired)
8haspience
Status:Retired
Estimated Rank:
6 kyu
Fundamentals
Recursion
Algorithms
Computability Theory
Logic
Theoretical Computer Science
2 kyu
Count them all!
168pier-bezuhoff
Functional Programming
Mathematics
Fundamentals
2 kyu
Writing applicative parsers from scratch
339muesli4
Data Structures
Parsing
Strings
Algorithms
Tutorials
3 kyu
Constructing finite fields using binary polynoms
156muesli4
Mathematics
Data Structures
Algebra
Strings
Algorithms
2 kyu
Operator Parser
101matthewmoppett
Parsing
Data Structures
Compilers
Puzzles
3 kyu
Recurrence relations
278Ivana
Performance
Fundamentals
6 kyu
Product Groups
183xcthulhu
Mathematics
Fundamentals
4 kyu
Sort binary tree by levels
13,305kars7e
Trees
Binary Trees
Performance
Algorithms
Sorting
Beta
Equational reasoning with scanl
11haspience
Status:Testing & feedback needed
Estimated Rank:
5 kyu
Recursion
Fundamentals
6 kyu
Guess the array
332ice1000
Puzzles
Algorithms
Arrays
4 kyu
One Line Task: How many digits?
190Voile
Restricted
Fundamentals
5 kyu
Binary Tree Traversal
2,014Ban-Ath
Binary Trees
Trees
Recursion
Data Structures
Algorithms
6 kyu
Tribonacci Sequence
154,070GiacomoSorbi
Number Theory
Arrays
Lists
Fundamentals
6 kyu
Hughes' List
213tel
Algorithms
6 kyu
Hutton's Razor
454tel
Interpreters
Fundamentals
6 kyu
Generalizing fold
105haspience
Recursion
Fundamentals
6 kyu
One Line Task: Fix
44haspience
Recursion
Functional Programming
Restricted
Fundamentals
Beta
Folding trees
25haspience
Status:Testing & feedback needed
Estimated Rank:
6 kyu
Fundamentals
5 kyu
Human Readable Time
143,168BattleRattle
Date Time
Mathematics
Algorithms
6 kyu
drop from end
62JohanWiltink
Lists
Performance
Fundamentals
6 kyu
Count the smiley faces!
96,575St3f4n
Regular Expressions
Fundamentals
6 kyu
Sums of Parts
24,423g964
Fundamentals
Performance
Algorithms
4 kyu
Sum of Intervals
38,594xDranik
Algorithms
Performance
2 kyu
Odd + Even = Odd? Prove it!
717AJFarmar
Number Theory
Fundamentals
1 kyu
A+B=B+A? Prove it!
460AJFarmar
Mathematics
Fundamentals
4 kyu
Simple Syntax Tokenizing
193AJFarmar
Strings
Parsing
Algorithms
5 kyu
Square Matrix Multiplication
7,248xDranik
Matrix
Linear Algebra
Algorithms
5 kyu
Can you get the loop ?
28,448Devouring
Algorithms
Linked Lists
Performance
5 kyu
Bananas
1,064dinglemouse
Strings
Algorithms
4 kyu
Magnet particules in boxes
7,618g964
Mathematics
Matrix
Algorithms
6 kyu
Interpolation Phalanx
129tel
Interpreters
Fundamentals
6 kyu
Daggerlang
216tel
Interpreters
Fundamentals
1 kyu
Sloth
49lolisa
Functional Programming
Fundamentals
4 kyu
(A+B)+C=A+(B+C)? Prove it!
273ice1000
Theorem Proving
Mathematics
Fundamentals
1 kyu
A*B=B*A? Prove it!
212ice1000
Theorem Proving
Mathematics
Fundamentals
1 kyu
Faberge easter eggs crush test [linear]
1,558ice1000
Performance
Algorithms
Mathematics
3 kyu
Fabergé Easter Eggs crush test
1,806Ivana
Mathematics
Dynamic Programming
Performance
Algorithms
5 kyu
DNE equivalent to PEM? Prove It!
212yuxuanchiadm
Mathematics
Fundamentals
7 kyu
String array joining in Haskell
574user578387
Arrays
Strings
Algorithms
3 kyu
Alphabetic Anagrams
6,231Azuaron
Mathematics
Logic
Strings
Algorithms
4 kyu
Determining if a graph has a solution
1,491damned3
Algorithms
Data Structures
Graph Theory
5 kyu
Image Processing
740constablebrew
Image Processing
Matrix
Algorithms
4 kyu
Longest Common Subsequence (Performance version)
2,404JohanWiltink
Performance
Strings
Dynamic Programming
Memoization
Algorithms
4 kyu
Escape the Mines or die !
127ice1000
Algorithms
Data Structures
Graph Theory
Retired
Escape the Mines ! (retired)
2,510damned3
Data Structures
Algorithms
Puzzles
Graph Theory
6 kyu
Draw a Circle.
163AJFarmar
Strings
Geometry
ASCII Art
Algorithms
6 kyu
Array.diff
284,682marcinbunsch
Arrays
Fundamentals
Algorithms
6 kyu
Title Case
37,371user527539
Strings
Fundamentals
6 kyu
Write Number in Expanded Form
80,321Belax8
Strings
Mathematics
Algorithms
Fundamentals
4 kyu
How many numbers III?
3,976raulbc777
Fundamentals
Data Structures
Algorithms
Mathematics
Logic
4 kyu
Esolang Interpreters #3 - Custom Paintf**k Interpreter
2,736donaldsebleung
Esoteric Languages
Interpreters
Algorithms
Tutorials
3 kyu
Esolang Interpreters #4 - Boolfuck Interpreter
2,003donaldsebleung
Esoteric Languages
Interpreters
Algorithms
Tutorials
5 kyu
Esolang Interpreters #2 - Custom Smallfuck Interpreter
3,903donaldsebleung
Esoteric Languages
Interpreters
Algorithms
Tutorials
4 kyu
Twice linear
22,855g964
Mathematics
Algorithms
5 kyu
Memoized Fibonacci
23,122edalorzo
Memoization
Refactoring