Recent Solutions
Achievements
Cheevos
Golfers
Solutions
All Holes
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
Billiards
brainfuck
Calendar
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
Continued Fractions
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Gray Code Decoder
Gray Code Encoder
Happy Numbers
Happy Numbers (Long)
Hexdump
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
Morse Decoder
Morse Encoder
Multitap Input
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Partition Numbers
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Alphabetic Numbers
Apéry’s Constant
Binary Lambda Calculus
Connect Four
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
All Languages
><>
ALGOL 68
ArkScript
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
Erlang
F#
Factor
Forth
Fortran
Gleam
Go
GolfScript
Groovy
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
05AB1E
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Lily
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
Bytes
Chars
Scoring
Bytes
Chars
Language
All
><>
ALGOL 68
ArkScript
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
Erlang
F#
Factor
Forth
Fortran
Gleam
Go
GolfScript
Groovy
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
Experimental Language
05AB1E
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Lily
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
Hole
All
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
Billiards
brainfuck
Calendar
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
Continued Fractions
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Gray Code Decoder
Gray Code Encoder
Happy Numbers
Happy Numbers (Long)
Hexdump
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
Morse Decoder
Morse Encoder
Multitap Input
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Partition Numbers
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Experimental Hole
Alphabetic Numbers
Apéry’s Constant
Binary Lambda Calculus
Connect Four
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
Hole
Golfer
Bytes
Time
Submitted
Kaprekar Numbers
flekAI
439
215ms
12 mins ago
Recamán
flekAI
126
232ms
12 mins ago
Tower of Hanoi
flekAI
90
261ms
43 mins ago
Catalan Numbers
flekAI
107
250ms
96 mins ago
Trinomial Triangle
flekAI
190
269ms
96 mins ago
Farey Sequence
flekAI
190
290ms
96 mins ago
Pascal’s Triangle
flekAI
139
240ms
96 mins ago
99 Bottles of Beer
flekAI
564
275ms
3 hours ago
Gray Code Decoder
flekAI
120
459ms
3 hours ago
Gray Code Encoder
flekAI
97
446ms
3 hours ago
Van Eck Sequence
flekAI
132
291ms
3 hours ago
Ascending Primes
flekAI
354
290ms
3 hours ago
Rule 110
flekAI
356
303ms
3 hours ago
Partition Numbers
flekAI
93
244ms
3 hours ago
Kolakoski Sequence
flekAI
171
265ms
3 hours ago
Roman to Arabic
flekAI
251
2,148ms
3 hours ago
Taxicab Numbers
flekAI
120
1,561ms
4 hours ago
Inventory Sequence
flekAI
107
2,500ms
4 hours ago
Lucky Numbers
flekAI
123
4,095ms
4 hours ago
Look and Say
flekAI
171
258ms
4 hours ago
Leyland Numbers
flekAI
197
621ms
4 hours ago
Pangram Grep
flekAI
101
299ms
5 hours ago
Pernicious Numbers (Long)
flekAI
86
401ms
5 hours ago
Pernicious Numbers
flekAI
81
243ms
5 hours ago
ASCII Table
flekAI
146
249ms
6 hours ago
ROT13
flekAI
184
291ms
6 hours ago
Christmas Trees
flekAI
74
253ms
6 hours ago
Divisors
flekAI
45
255ms
6 hours ago
Prime Numbers (Long)
flekAI
80
979ms
7 hours ago
Prime Numbers
flekAI
77
248ms
7 hours ago
Leap Years
flekAI
57
257ms
7 hours ago
Odious Numbers (Long)
flekAI
72
333ms
7 hours ago
Niven Numbers (Long)
flekAI
57
4,431ms
7 hours ago
Niven Numbers
flekAI
55
278ms
7 hours ago
Foo Fizz Buzz Bar
flekAI
133
261ms
7 hours ago
Evil Numbers (Long)
flekAI
76
357ms
7 hours ago
Collatz
flekAI
75
314ms
7 hours ago
Abundant Numbers (Long)
flekAI
64
1,697ms
7 hours ago
Abundant Numbers
flekAI
63
311ms
7 hours ago
Odious Numbers
flekAI
58
223ms
8 hours ago
Evil Numbers
flekAI
58
218ms
8 hours ago
Fibonacci
flekAI
35
187ms
8 hours ago
Fizz Buzz
flekAI
88
192ms
8 hours ago
Factorial Factorisation
retrohun
874
197ms
32 hours ago
Diamonds
blaztoma
🥉
55
203ms
42 hours ago
CSS Colors
scpchicken
69
373ms
47 hours ago
Leap Years
isenschmid
40
231ms
2 days ago
Day of Week
Emutis
🥇
16
249ms
2 days ago
Kaprekar Numbers
DialFrost
💎
97
4,359ms
2 days ago
Day of Week
blaztoma
🥇
16
317ms
3 days ago
Van Eck Sequence
jusaka
2,579
263ms
3 days ago
Vampire Numbers
jusaka
1,095
287ms
3 days ago
Trinomial Triangle
jusaka
2,090
209ms
3 days ago
Taxicab Numbers
jusaka
4,184
253ms
3 days ago
Smith Numbers
jusaka
1,848
261ms
3 days ago
Rijndael S-box
jusaka
792
280ms
3 days ago
Recamán
jusaka
921
302ms
3 days ago
Prime Numbers (Long)
jusaka
5,972
240ms
3 days ago
Polygon Triangulations
jusaka
4,336
267ms
3 days ago
Pascal’s Triangle
jusaka
793
290ms
3 days ago
Partition Numbers
jusaka
671
272ms
3 days ago
Odious Numbers (Long)
jusaka
1,969
224ms
3 days ago
N Queens
jusaka
1,270
219ms
3 days ago
Lucky Numbers
jusaka
4,844
290ms
3 days ago
Look and Say
jusaka
1,303
273ms
3 days ago
Leyland Numbers
jusaka
910
258ms
3 days ago
Leap Years
jusaka
754
220ms
3 days ago
Kaprekar Numbers
jusaka
464
232ms
3 days ago
Inventory Sequence
jusaka
2,647
281ms
3 days ago
Highly Composite Numbers
jusaka
416
251ms
3 days ago
Happy Numbers (Long)
jusaka
576
269ms
3 days ago
Gijswijt’s Sequence
jusaka
2,023
224ms
3 days ago
Fizz Buzz
jusaka
437
215ms
3 days ago
Farey Sequence
jusaka
4,377
277ms
3 days ago
Evil Numbers (Long)
jusaka
1,974
277ms
3 days ago
Emirp Numbers (Long)
jusaka
1,180
260ms
3 days ago
Divisors
jusaka
1,190
230ms
3 days ago
12 Days of Christmas
jusaka
2,393
256ms
3 days ago
Abundant Numbers (Long)
jusaka
988
254ms
3 days ago
Collatz
jusaka
3,250
259ms
3 days ago