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
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
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
Apéry’s Constant
Binary Lambda Calculus
Connect Four
Continued Fractions
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
All Languages
><>
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
ALGOL 68
APL
ArkScript
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
><>
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
ALGOL 68
APL
ArkScript
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
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
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
Apéry’s Constant
Binary Lambda Calculus
Connect Four
Continued Fractions
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
Hole
Golfer
Bytes
Time
Submitted
Fractions
ovs-code
80
11ms
19 hours ago
Trinomial Triangle
ovs-code
57
3ms
19 hours ago
Hexdump
ovs-code
201
3ms
19 hours ago
Number Spiral
ovs-code
61
3ms
19 hours ago
Tutorial
FortuiteMan
100
3ms
5 days ago
π
Andrey2001
1,010
3ms
14 days ago
Tutorial
Mefred
100
3ms
15 days ago
𝑒
JOrE20
1,010
3ms
5 Jan 2026
Quine
dokutan
59
3ms
18 Dec 2025
99 Bottles of Beer
kurkale6ka
11,892
3ms
17 Dec 2025
Happy Numbers
ovs-code
45
3ms
9 Dec 2025
Pascal’s Triangle
AlephSquirrel
56
3ms
9 Dec 2025
Happy Numbers (Long)
AlephSquirrel
50
6ms
9 Dec 2025
Happy Numbers
AlephSquirrel
49
4ms
9 Dec 2025
Fibonacci
AlephSquirrel
38
3ms
9 Dec 2025
Gray Code Decoder
ovs-code
42
6ms
7 Dec 2025
Gray Code Decoder
AlephSquirrel
42
6ms
3 Dec 2025
Collatz
AlephSquirrel
74
9ms
2 Dec 2025
Abundant Numbers (Long)
AlephSquirrel
48
8ms
2 Dec 2025
Abundant Numbers
AlephSquirrel
47
3ms
2 Dec 2025
Ascending Primes
AlephSquirrel
73
2,249ms
2 Dec 2025
Leap Years
AlephSquirrel
49
3ms
2 Dec 2025
Tower of Hanoi
KatieLG
8,175
4ms
30 Nov 2025
Sierpiński Triangle
AlephSquirrel
50
3ms
28 Nov 2025
Rule 110
AlephSquirrel
60
3ms
28 Nov 2025
Niven Numbers (Long)
AlephSquirrel
44
8ms
28 Nov 2025
Pernicious Numbers (Long)
AlephSquirrel
67
7ms
28 Nov 2025
Pernicious Numbers
AlephSquirrel
44
3ms
28 Nov 2025
Odious Numbers (Long)
ovs-code
31
3ms
27 Nov 2025
Odious Numbers
ovs-code
29
3ms
27 Nov 2025
Evil Numbers
ovs-code
29
3ms
27 Nov 2025
Evil Numbers (Long)
ovs-code
31
3ms
27 Nov 2025
Evil Numbers (Long)
AlephSquirrel
32
3ms
27 Nov 2025
Odious Numbers (Long)
AlephSquirrel
32
3ms
27 Nov 2025
Evil Numbers
AlephSquirrel
31
3ms
27 Nov 2025
Odious Numbers
AlephSquirrel
31
3ms
27 Nov 2025
𝑒
BREMAUCY
1,010
3ms
27 Nov 2025
Taxicab Numbers
HumanoidCPU
4,167
3ms
27 Nov 2025
Tongue-twisters
dokutan
530
3ms
26 Nov 2025
Niven Numbers
AlephSquirrel
43
3ms
26 Nov 2025
Taxicab Numbers
ovs-code
50
6ms
26 Nov 2025
Taxicab Numbers
Shanethegamer
4,167
3ms
26 Nov 2025
Leyland Numbers
AlephSquirrel
46
3ms
25 Nov 2025
Prime Numbers (Long)
AlephSquirrel
48
221ms
21 Nov 2025
Prime Numbers
AlephSquirrel
46
3ms
21 Nov 2025
Fizz Buzz
AlephSquirrel
71
3ms
20 Nov 2025
Set
ovs-code
88
361ms
17 Nov 2025
Kolakoski Sequence
HumanoidCPU
2,007
3ms
12 Nov 2025
Tower of Hanoi
HumanoidCPU
3,584
3ms
6 Nov 2025
Tower of Hanoi
Shanethegamer
3,584
3ms
30 Oct 2025
Tutorial
Babafaba
100
4ms
15 Oct 2025
Fizz Buzz
snoozingnewt
63
3ms
10 Oct 2025
Tutorial
retrohun
100
4ms
19 Sep 2025
Tutorial
snoozingnewt
52
3ms
15 Sep 2025
Fizz Buzz
CaedenHarper
63
3ms
28 Aug 2025
Tutorial
Vexxter9
100
4ms
21 Aug 2025
Highly Composite Numbers
HumanoidCPU
399
4ms
18 Aug 2025
Semiprime Numbers
HumanoidCPU
12,796
4ms
18 Aug 2025
Hilbert Curve
HumanoidCPU
5,125
4ms
18 Aug 2025
Abundant Numbers (Long)
HumanoidCPU
971
5ms
18 Aug 2025
Polyominoes
HumanoidCPU
3,571
3ms
18 Aug 2025
Recamán
HumanoidCPU
904
3ms
18 Aug 2025
Pascal’s Triangle
HumanoidCPU
776
3ms
18 Aug 2025
Kaprekar Numbers
HumanoidCPU
447
3ms
18 Aug 2025
Happy Numbers
HumanoidCPU
114
4ms
18 Aug 2025
Happy Numbers (Long)
HumanoidCPU
559
3ms
18 Aug 2025
Emirp Numbers (Long)
HumanoidCPU
1,163
2ms
18 Aug 2025
Catalan Numbers
HumanoidCPU
2,879
3ms
18 Aug 2025
Tongue-twisters
HumanoidCPU
530
3ms
18 Aug 2025
Van Eck Sequence
HumanoidCPU
2,562
2ms
17 Aug 2025
Abundant Numbers
HumanoidCPU
170
2ms
16 Aug 2025
Look and Say
HumanoidCPU
1,286
2ms
15 Aug 2025
Leyland Numbers
HumanoidCPU
893
3ms
15 Aug 2025
Farey Sequence
HumanoidCPU
4,361
3ms
15 Aug 2025
Diamonds
HumanoidCPU
1,110
3ms
14 Aug 2025
Niven Numbers
HumanoidCPU
98
3ms
14 Aug 2025
Lucky Numbers
HumanoidCPU
4,827
3ms
14 Aug 2025
Inventory Sequence
HumanoidCPU
2,630
3ms
14 Aug 2025
Gijswijt’s Sequence
HumanoidCPU
2,007
3ms
14 Aug 2025
Smith Numbers
HumanoidCPU
1,831
3ms
14 Aug 2025