- 16+18=214
- 21 Sticks
- 254 shades of grey
- 2D Vector Mapping
- 80's Kids #1: How Many Licks Does it Take?
- 80's Kids #2: Help ALF Find His Spaceship
- 80's Kids #3: Punky Brewster's Socks
- 80's Kids #5: You Can't Do That on Television
- A Letter's Best Friend
- A Man and his Earthly Measurement
- A Rule of Divisibility by 7
- A snail enters a bar!
- Acronym Generator
- AD2070: Help Lorimar troubleshoot his robots- ultrasonic distance analysis
- Adding values of arrays in a shifted way
- Aerial Firefighting
- Age in days
- All Inclusive?
- All Nines
- All Star Code Challenge #22
- All unique
- Alphabet symmetry
- Alphabet war
- Alphabetical Addition
- Alphabetical Sequence
- Alternate capitalization
- Alternate case
- Alternate Square Sum
- An English Twist on a Japanese Classic
- Anagram Detection
- Another card game
- Anti-virus file scanner
- ANTISTRING
- Approaching enemies
- Are the numbers in order?
- Area of a Circle
- Arithmetic progression
- Arithmetic Sequence!
- Array - squareUp b!
- Array element parity
- Array Leaders (Array Series #3)
- ATM
- Automorphic Number (Special Numbers Series #6)
- Averages of numbers
- Balanced Number (Special Numbers Series #1)
- Basic Calculator
- Basic Sequence Practice
- Basics - Generators #1
- Batman Quotes
- Battle of the characters (Easy)
- Beginner Series #3 Sum of Numbers
- Between Extremes
- Binary Addition
- Binary Calculator
- Binary scORe
- Binary sXORe
- Bingo (Or Not)
- Bits Battle
- Blood Moon
- Blowing Birthday Candles
- Breaking chocolate problem
- Broken sequence
- Bubblesort Once
- [BUG] XCOM-241: Genome mapper freezes
- Build a square
- Building blocks
- Bulls and Cows
- Bumps in the Road
- Bus mastering - Who is the most prioritary?
- C.Wars
- Caffeine Script
- Calculate mean and concatenate string
- Calculate the Harmonic Conjugated Point of a Triplet of Aligned Points
- Cartesian coordinates from degree angle
- Cartesian neighbors
- Cat Years, Dog Years (2)
- Cats and shelves
- Center of the Matrix
- Ch4113ng3
- Change two-dimensional array
- Changing letters
- Character Counter
- Check contained matrix
- Check three and two
- Chinese Zodiac
- Circle cipher
- Circular List
- Clean up after your dog
- Closest to Zero
- Closing in Sum
- Codewars Leaderboard Climber
- Cogs
- Cogs 2
- Collatz Conjecture Length
- Colored Hexes!
- Coloured Triangles
- Common Substrings
- Compare Strings by Sum of Chars
- Complementary DNA
- Complete The Pattern #1
- Complete The Pattern #2
- Complete The Pattern #4
- Composing squared strings
- CompoundArray
- Computer problem series #1: Fill the Hard Disk Drive
- Conference Traveller
- Consecutive Digits To Form Sum
- Consecutive letters
- Convert a linked list to a string
- Convert Time to String
- Converting from base 10 to 16! Dare you?
- Correct the time-string
- Count all the sheep on farm in the heights of New Zealand
- Count consonants
- Count the Digit
- Count the divisors of a number
- Covfefe
- Create palindrome
- Credit card issuer checking
- Credit Card Mask
- Cryptanalysis Word Patterns
- Curing Arachnophobia
- Currying functions: multiply all elements in an array
- Cyclops numbers
- Day of the Year
- Debug Sum of Digits of a Number
- Decimal decomposition
- Decimal Time Conversion
- Decipher the Message
- Delta Bits
- Deodorant Evaporator
- Descending Order
- Describe a list
- Determine if the poker hand is flush
- Dice Rotation
- Difference between two collections
- Difference between years. (Level 1)
- Digital cypher
- Digital cypher vol 2
- Digitize
- Digits explosion
- Disagreeable ascii
- Disarium Number (Special Numbers Series #3)
- Disemvowel Trolls
- Don't give me five!
- Dot Calculator
- Double Every Other
- Double Sort
- Double Trouble
- Double value every next call
- Driving Licence
- Driving School Series #2
- Drying Potatoes
- E.S.P. Cards
- EAN Validation
- Easy Line
- Easy wallpaper
- Eliminate the intruders! Bit manipulation
- Email Address Obfuscator
- Excel sheet column numbers
- Excessively Abundant Numbers
- Exclamation marks series #5: Remove all exclamation marks from the end of words
- Exclamation marks series #8: Move all exclamation marks to the end of the sentence
- Execute me nTimes
- Exes and Ohs
- Extended weekends
- Extra Perfect Numbers (Special Numbers Series #7)
- Factorial
- Factorial
- Figurate Numbers #2 - Pronic Number
- Fibonacci
- Filter the number
- Find Count of Most Frequent Item in an Array
- Find Fibonacci last digit
- Find Max Tree Node
- Find min and max
- Find Screen Size
- Find sum of top-left to bottom-right diagonals
- Find the index of the second occurrence of a letter in a string
- Find the Missing Number
- Find the next perfect square!
- Find the nth occurrence of a word in a string!
- Find the smallest power higher than a given a value
- Find the Squares
- Find the stray number
- Find the sum of the roots of a quadratic equation
- Find your caterer
- Finding queens on the board
- Finding Remainder Without Using '%' Operator
- Fix string case
- FIXME: 1, 2, 3, 4
- FIXME: Get Full Name
- FIXME: Hours to Seconds
- FIXME: Let's split this joint
- FIXME: Run, Runner!
- Fizz / Buzz
- Fizz Buzz Cuckoo Clock
- Flatten and sort an array
- Floating-point Approximation (III)
- Folding your way to the moon
- Form The Minimum
- Formatting decimal places #1
- Four/Seven
- Friend or Foe?
- Friends
- From A to Z
- Fun with lists: anyMatch + allMatch
- Fun with lists: indexOf
- Fun with lists: lastIndexOf
- Fun with lists: length
- Functional Addition
- Functions of Integers on Cartesian Plane
- Fusion Chamber Shutdown
- GCD sum
- Geometry Basics: Dot Product in 3D
- Geometry Basics: Triangle Perimeter in 2D
- Get the Middle Character
- Ghostbusters (whitespace removal)
- Go: Stone Scoring
- Going to the cinema
- Greatest common divisor
- Greatest Common Divisor Bitcount
- Green Glass Door
- Greet Me
- Growth of a Population
- Guarding the AlgoLandia
- Guava against Million dollar error
- Guess the Sequence
- Halving Sum
- Happy Birthday 1
- Happy Birthday, Darling!
- Harvest Festival
- Hello World - Without Strings
- Help Suzuki complete his chores!
- Help Suzuki rake his garden!
- Help the Fruit Guy
- Help your fellow warrior!
- Herding cats
- Hero's root
- Heron's formula
- Hide password from jdbc url
- Highest and Lowest
- Highest Value Pyramid
- Histogram - H1
- Histogram - H2
- Holiday III - Fire on the boat
- Holiday VII - Local Talk
- How far will I go?
- How Green Is My Valley?
- How long should you cook this for?
- How many arguments
- How many consecutive numbers are needed?
- How many days are we represented in a foreign country?
- How Many Streets?
- How many urinals are free?
- Hungarian Vowel Harmony (easy)
- Hëävÿ Mëtäl Ümläüts
- I Will Take the Biggest One and Nothing Else
- Incrementer
- Indexed capitalization
- Infinitely Nested Radicals
- Insert dashes
- Inspiring Strings
- Integer Primitive Data Types
- Interactive Dictionary
- Interlocking Binary Pairs
- IntTunes
- Invisible cubes
- Is It Negative Zero (-0)?
- Is n divisible by (...)?
- Is Sator Square?
- Is this a triangle?
- Is valid identifier?
- Isograms
- Jaden Casing Strings
- Java Functional Programming (Part 1: The Beginning)
- Java Functional Programming (Part 2: Multiline Functions)
- Java Functional Programming (Part 3: Closured for Business)
- Java: Generic Inheritance
- Jumping Number (Special Numbers Series #4)
- Large sum
- Largest 5 digit number in a series
- Largest Elements
- Largest pair sum in array
- Last
- Last Survivor
- Latin Squares
- Laxative Shot Roulette
- Leap Years
- Length and two values
- Letterbox Paint-Squad
- Likes Vs Dislikes
- Linked Lists - Append
- Linked Lists - Get Nth Node
- Linked Lists - Push & BuildOneTwoThree
- List Filtering
- Lombok Builder
- Lombok Encapsulation
- London CityHacker
- Longest vowel chain
- Looking for a benefactor
- Lost number in number sequence
- Love vs friendship
- Lucky number
- Lunar Mathematics: Addition
- Make a function that does arithmetic!
- Make Me Slow
- Make Backronym
- Map over a list of lists
- Match My Husband
- Math.pow?
- Matrix Addition of Elements
- Matrix Square Up, B!
- Matrix Weight
- Max diff - easy
- Max sum between two negatives
- Max-min arrays
- Maximum Gap (Array Series #4)
- Maximum Length Difference
- Maximum Multiple
- Maximum Product
- Maximum Triplet Sum (Array Series #7)
- Mean vs. Median
- Mew Cipher
- Mind the Gap
- Minimize Sum Of Array (Array Series #1)
- Minimum Steps (Array Series #6)
- Minimum Ticket Cost
- Misleading Signs
- MOD 256 without the MOD operator
- Money, Money, Money
- Monty Hall Problem
- More than Zero?
- Most digits
- Most valuable character
- Move 10
- Moves in squared strings (I)
- Multiple implications
- Multiplication - Generators #2
- Mumbling
- My Language Skills
- Mystery Colors
- N-Dimensional Vector Magnitude
- Name Array Capping
- Name That Number!
- Nice Array
- Nickname Generator
- Nth power rules them all!
- Nth Smallest Element (Array Series #4)
- Null
- Number of Decimal Digits
- Number of People in the Bus
- Number of Rectangles in a Grid
- Number-Star ladder
- Number to digit tiers
- Numbers in strings
- Numbers Which Sum of Powers of Its Digits Is The Same Number
- Numbers with d occurrences of digit d
- Numbers with this digit inside
- O's and X's adjudicator
- Odd March Bits 8 bits
- Odd or Even?
- Odder Than the Rest
- Odd-Even String Sort
- Ones and Zeros
- Ordered Count of Characters
- Ordering the words!
- ORing arrays
- Orthogonal Vectors
- Over The Road
- Overflowing with joy
- Page replacement algorithms: FIFO
- Palindrome chain length
- Pandemia 🌡️
- Parallel resistors
- Partial Word Searching
- Parts of a list
- Password maker
- Password System
- Paul's Misery
- Perpendicular lines
- Pizza Payments
- Plan Your Dream Wedding
- Playing Cards Draw Order – Part 1
- Plus - minus - plus - plus - ... - Count
- Point in a unit circle
- Pokerhand, straight or not?
- Possibilities Array
- Power of two
- Powers of i
- Predict your age!
- Previous multiple of three
- Principal Diagonal VS Secondary Diagonal
- Printer Errors
- Prison Break
- Product Array (Array Series #5)
- Product Of Maximums Of Array (Array Series #2)
- Product of the main diagonal of a square matrix
- Recursion 101
- Red Knight
- Redacted!
- Reduce My Fraction
- Regex validate PIN code
- Regex validation of 24 hours time.
- Regexp Basics - is it a eight bit signed number?
- Regexp Basics - is it a eight bit unsigned number?
- Regexp Basics - is it a hexadecimal number?
- Regexp Basics - is it a letter?
- Regexp Basics - is it a six bit unsigned number?
- Regexp Basics - is it a vowel?
- Regexp basics - parsing prices
- Remove consecutive duplicate words
- Remove duplicate words
- Remove the minimum
- Replace every nth
- Resistor Color Codes
- Responsible Drinking
- Return the first M multiples of N
- Reverse a Number
- Reverse the bits in an integer
- Reverse words
- Reversing Fun
- Robinson Crusoe
- Robotic Tattoo Removal
- Rock Off!
- Rock Paper Scissors Lizard Spock
- Rotate for a Max
- Round up to the next multiple of 5
- Row Weights
- Running out of space
- Santa's Naughty List
- Scaling Squared Strings
- Scoring Tests
- Scrabble Score
- Scrolling Text
- Search for letters
- Sectional Array Sort
- See You Next Happy Year
- Selective fear of numbers
- Send in the Clones
- Set Reducer
- Shift Left
- Shifter words
- Shorter concat [reverse longer]
- Shortest Word
- Show multiples of 2 numbers within a range
- Simple array product
- Simple beads count
- Simple consecutive pairs
- Simple directions reversal
- Simple equation reversal
- Simple eviternity numbers
- Simple fibonacci strings
- Simple Fun #11: Swap Adjacent Bits
- Simple Fun #152: Invite More Women?
- Simple Fun #176: Reverse Letter
- Simple Fun #2: Circle of Numbers
- Simple Fun #37: House Numbers Sum
- Simple Fun #40: Timed Reading
- Simple Fun #41: Elections Winners
- Simple Fun #63: Shape Area
- Simple Fun #74: Growing Plant
- Simple Fun #9: Array Packing
- Simple letter removal
- Simple Maths Test
- Simple remove duplicates
- Simple Socket Client
- Simple string characters
- Simple string division
- Simple string division II
- Simple string reversal
- Simple string reversal II
- Single digit
- Small enough? - Beginner
- Smallest value of an array
- Smoking Timmy
- Smooth numbers
- Snail crawls up
- Sort an array by value and index
- Sort arrays - 1
- Sort by binary ones
- Sort deck of cards
- Sort Out The Men From Boys
- Sort the Gift Code
- Sorted? yes? no? how?
- Sorting the Odd way!
- Special Number (Special Numbers Series #5)
- Speed Control
- Speed Limit
- Split By Value
- Split In Parts
- Spoonerize Me
- Square Every Digit
- Square Pi's
- Stacked Balls - 2D
- Stacked Balls - 3D (square base)
- Stacked Balls - 3D (triangle base)
- Stanton measure
- Status Arrays
- Steps
- Stone Pickaxe Crafting
- Strange mathematics
- String ends with?
- String interlacing
- String Merge!
- String Packet Based Communications
- String prefix and suffix
- Strong Number (Special Numbers Series #2)
- Subcuboids
- Suitcase packing
- Sum a list but ignore any duplicates
- Sum Array with different bases
- Sum of a sequence
- Sum of angles
- Sum of array singles
- Sum of Cubes
- Sum of differences between products and LCMs
- Sum of numbers from 0 to N
- Sum of Odd Cubed Numbers
- Sum of odd numbers
- Sum of the first nth term of Series
- Sum of Triangular Numbers
- Sum of two lowest positive integers
- Summation Triangle #1
- Supernatural
- Survive the attack
- Suzuki needs help lining up his students!
- Swap pairs in Array
- Swapping Cards
- Switcheroo
- Target Date
- Ten Green Bottles
- Testing 1-2-3
- The 'spiraling' box
- The 12 Days of Christmas
- The alphabet product
- The Baum-Sweet sequence
- The Culling of Stratholme
- The First Non Repeated Character In A String
- The fusc function -- Part 1
- The highest profit wins!
- The Hunting of the Snark
- The Nail
- The Office I - Outed
- The Office II - Boredom Score
- The Office III - Broken Photocopier
- The Office IV - Find a Meeting Room
- The old switcheroo
- The Poet And The Pendulum
- The Pony Express
- The Speed of Letters
- The wheat/rice and chessboard problem
- Thinkful - Number Drills: Congo warehouses
- Thinking & Testing : Incomplete string
- Thinking & Testing : Something capitalized
- Thinking & Testing : True or False
- Thinking & Testing : Uniq or not Uniq
- Thinking & Testing: A and B?
- Tidy Number (Special Numbers Series #9)
- ToLeetSpeak
- Treasure Hunt with Clues
- Triangle area
- Triangles from Dots
- Triangular Treasure
- Trigrams
- Trilingual democracy
- TV Remote
- Two fighters, one winner
- Two numbers are positive
- Two to One
- Uglify Word
- Ultimate Array Reverser
- Unflatten a list (Easy)
- Unique string characters
- Unlucky Days
- Unusual Lex Order
- URL Timestamps
- V A P O R C O D E
- Valid Parentheses
- Valid Spacing
- Valid teams and names
- Very Even Numbers
- Visible Dots On a Die
- Vowel Count