λ Calculus (Beta)
Choose Language...
Python
JavaScript
Java
C++
C#
Ruby
Go
TypeScript
BF (Beta)
Elixir
CoffeeScript
Coq
Agda (Beta)
Haskell
Swift
λ Calculus (Beta)
Train Now

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.

Description

Some great katas get stuck in beta, often because they are hard.

Our mission is to free these gems from the depths!

Katas here are generally highly rated, but with low solves. Try solve as many as you can. I will keep track of how many from this collection are raised from the depths.

Let me know on the codewars discord if there are katas I should add to the collection.

Beta
Chalkboard math mistake (simple version)
11davilla
Status:Waiting for issues to be resolved
Algorithms
Beta
Shortest math expression
5davilla
Status:Ranking feedback needed
Algorithms
Beta
Native gibberish
13davilla
Status:Waiting for issues to be resolved
Puzzles
Beta
Four Color Theorem for Cylindrical Projection
13doooom
Status:Waiting for issues to be resolved
Estimated Rank:
2 kyu
Algorithms
Graph Theory
2 kyu
Generator Functions
24phantamanta44
Iterators
Functional Programming
Fundamentals
Beta
Tragic: the Maddening
9kurokikaze
Status:Testing & feedback needed
Estimated Rank:
2 kyu
Algorithms
Graph Theory
Beta
Member Detection
26sv90
Status:Waiting for issues to be resolved
Estimated Rank:
3 kyu
Metaprogramming
Fundamentals
Beta
Seat Allocation Double Dutch
19FrankK
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Mathematics
Algorithms
Draft
6 By 6 Bimaru Solver
8S_OK
Status:Draft
Estimated Rank:
4 kyu
Games
Algorithms
Game Solvers
Puzzles
Beta
Crypto-currency Miner
23njlr
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Algorithms
Beta
Testing 'Food combinations'
9Insti
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Fundamentals
Beta
Harmonious Array
9lucifer1004
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Algorithms
Beta
Reactive programming: #1 Create function
54surtich
Status:Waiting for issues to be resolved
Reactive Programming
RxJS
Fundamentals
Beta
[BF] Unix Timestamp to Weekday
8iNont
Status:Ranking feedback needed
Estimated Rank:
3 kyu
Fundamentals
Algorithms
Mathematics
Date Time
Beta
The Messenger's Oracle
7Greatlemer
Status:Waiting for issues to be resolved
Estimated Rank:
2 kyu
Cryptography
Puzzles
Algorithms
Security
Beta
Draw the borders III - Fancy borders
4mauro-1
Status:Testing & feedback needed
Estimated Rank:
2 kyu
Geometry
Strings
ASCII Art
Algorithms
Beta
The map and the keys
8bojidar-bg
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Puzzles
Beta
Increment a variable ...
4mauro-1
Status:Testing & feedback needed
Estimated Rank:
2 kyu
Esoteric Languages
Algorithms
Fundamentals
Beta
LU Decomposition
21Thom
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Algorithms
Linear Algebra
Mathematics
Matrix
Beta
Mr. White
7AlisaIsStillGodly
Status:Waiting for issues to be resolved
Estimated Rank:
5 kyu
Puzzles
Algorithms
Recursion
Beta
Intelligent Password Cracking
20Emilostuff
Status:Waiting for issues to be resolved
Estimated Rank:
5 kyu
Security
Algorithms
Beta
Value at Risk for an equity portfolio
8Marty3000
Status:Testing & feedback needed
Estimated Rank:
5 kyu
Fundamentals
Beta
Connect the dots - clockwise or counterclockwise? [code golf]
7mauro-1
Status:Ranking feedback needed
Estimated Rank:
6 kyu
Restricted
Algorithms
Beta
Countdown
17Juĉjo
Status:Waiting for issues to be resolved
Estimated Rank:
3 kyu
Data Structures
Algorithms
Beta
Clock Hands
32rtoal
Status:Waiting for issues to be resolved
Date Time
Mathematics
Geometry
Fundamentals
Beta
Counting Letters of Consecutive Numbers
18pianowow
Status:Waiting for issues to be resolved
Estimated Rank:
5 kyu
Algorithms
Beta
Clock Singularity
11Jomopipi
Status:Waiting for issues to be resolved
Estimated Rank:
3 kyu
Arrays
Mathematics
Algorithms
Beta
Queens and Kings Stable Marriages
11NotTuringComputableError
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Algorithms
Beta
Fibonacci String Search
8aewhite
Status:Waiting for issues to be resolved
Estimated Rank:
2 kyu
Algorithms
Mathematics
Beta
Laser Archery
6phantamanta44
Status:Ranking feedback needed
Estimated Rank:
5 kyu
Mathematics
Linear Algebra
Algorithms
Beta
Cracking the digital hash lock
7dramforever
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Performance
Strings
Algorithms
Security
Mathematics
Language Features
Beta
Simple Fun #392: Count Robot
6myjinxin2015
Status:Testing & feedback needed
Estimated Rank:
5 kyu
Puzzles
Mathematics
Arrays
Algorithms
Beta
Simple Fun #351: Gallup
7myjinxin2015
Status:Waiting for issues to be resolved
Estimated Rank:
6 kyu
Algorithms
Beta
Simple Fun #325: Coins In Hat
5myjinxin2015
Status:Testing & feedback needed
Estimated Rank:
5 kyu
Algorithms
Beta
Challenge Fun #23: Crossword Formation
5myjinxin2015
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Algorithms
Puzzles
Beta
Find the Maximum Mean Value in the Array
7myjinxin2015
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Algorithms
Arrays
Dynamic Programming
Beta
Num & Block -- Play game Series #13
3myjinxin2015
Status:Testing & feedback needed
Game Solvers
Fundamentals
4 kyu
Maze Keeper
21myjinxin2015
Algorithms
Puzzles
Games
Performance
Beta
One Line Task: Periodic Rows
13myjinxin2015
Status:Waiting for issues to be resolved
Estimated Rank:
5 kyu
Puzzles
Restricted
Beta
Poor man's spreadsheet API
6user6793616
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Performance
Parsing
Fundamentals
Beta
Verified fulcrum (Theorem prover showdown #3)
5dramforever
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Theorem Proving
Fundamentals
Beta
Planning a city quarantine
7dramforever
Status:Waiting for issues to be resolved
Estimated Rank:
3 kyu
Graph Theory
Performance
Algorithms
Beta
Verified cartesian tree
4dramforever
Status:Testing & feedback needed
Estimated Rank:
3 kyu
Theorem Proving
Algorithms
Beta
Cracking CRC32
10dramforever
Status:Waiting for issues to be resolved
Estimated Rank:
2 kyu
Algorithms
Performance
Mathematics
Binary
Beta
Basic Router With Named Segments
21DiegoSalazar
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Data Structures
Regular Expressions
Algorithms
Beta
Event Date Dilemma
22westonkd
Status:Waiting for issues to be resolved
Date Time
Fundamentals
Beta
Function extensionality and explicitness
17ice1000
Status:Awaiting approval
Estimated Rank:
5 kyu
Theorem Proving
Functional Programming
Fundamentals
Beta
Adding words - Part III
16osofem
Status:Testing & feedback needed
Estimated Rank:
5 kyu
Mathematics
Fundamentals
Beta
Bullseye!
14paragonHex
Status:Testing & feedback needed
Estimated Rank:
6 kyu
Games
Algorithms
Beta
Tic Tac Toe Tournament
8matstc
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Games
Puzzles
Beta
Layout ordered sections in columns
21mweiss
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Algorithms
Beta
Pine's Orange Tree
11srMarquinho
Status:Testing & feedback needed
Estimated Rank:
5 kyu
Trees
Fundamentals
Refactoring
Beta
Detecting Factions in Friend-Foe Networks
23AlexandraBaier
Status:Waiting for issues to be resolved
Estimated Rank:
5 kyu
Graph Theory
Algorithms
Data Structures
Beta
Computational Geometry #1: Mixing Paints
11ALowVerus
Status:Testing & feedback needed
Estimated Rank:
3 kyu
Algorithms
Beta
Coping with NP-Hardness #4: 3-Recoloring
5ALowVerus
Status:Testing & feedback needed
Fundamentals
Beta
Finding a Circulation
5ALowVerus
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Networks
Algorithms
Graph Theory
Beta
False coin
3Ivana
Status:Testing & feedback needed
Puzzles
Beta
Registering Callbacks in Ruby
7pawptart
Status:Waiting for issues to be resolved
Estimated Rank:
3 kyu
Dynamic Programming
Fundamentals
Beta
Heroes of the Arena, Part 1 - Simple Gladiators
66akrammon
Status:Waiting for issues to be resolved
Estimated Rank:
6 kyu
Object-oriented Programming
Games
Fundamentals
Beta
Folding Tiles Solver
10docgunthrop
Status:Waiting for issues to be resolved
Algorithms
Performance
Game Solvers
Puzzles
Beta
Java SecurityManager basics
11DasBrain
Status:Testing & feedback needed
Estimated Rank:
6 kyu
Puzzles
Beta
Exploit indirection to escalate permissions.
5DasBrain
Status:Testing & feedback needed
Estimated Rank:
1 kyu
Fundamentals
Beta
A foot in the door - disable the SecurityManager
9DasBrain
Status:Testing & feedback needed
Estimated Rank:
4 kyu
Puzzles
Security
Beta
The Church-Rosser Theorem
8donaldsebleung
Status:Ranking feedback needed
Estimated Rank:
3 kyu
Theorem Proving
Puzzles
Beta
Pentomino SOLVER
6eurydice5717
Status:Awaiting approval
Estimated Rank:
2 kyu
Game Solvers
Puzzles
Beta
Master Puppeteer
9bholmes
Status:Waiting for issues to be resolved
Estimated Rank:
4 kyu
Performance
Algorithms
Beta
Church Numerals - Prefix is Overrated (All Operations)
2monadius
Status:Testing & feedback needed
Algorithms
Beta
What will Agumon digivolve into? (Digimon World 1)
7Anon2028
Status:Waiting for issues to be resolved
Estimated Rank:
5 kyu
Games
Algorithms
Beta
Read a UPC/Barcode Part 2
26BinaryEclipse
Status:Waiting for issues to be resolved
Estimated Rank:
5 kyu
Algorithms