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
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
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
><>
ALGOL 68
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
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
><>
ALGOL 68
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
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
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
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
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
Tower of Hanoi
Lv0Sys
59
5ms
2 days ago
ROT13
denkyuu1
50
5ms
3 days ago
Evil Numbers
denkyuu1
61
5ms
3 days ago
Divisors
denkyuu1
82
5ms
3 days ago
Leap Years
denkyuu1
55
5ms
3 days ago
Alphabetic Numbers
HumanoidCPU
3,900
5ms
3 days ago
Billiards
targrik
🥉
156
15ms
4 days ago
Tower of Hanoi
zakariamouhid
3,584
5ms
5 days ago
Tower of Hanoi
Herbert00709
78
5ms
5 days ago
Tower of Hanoi
plcc0
69
5ms
5 days ago
Continued Fractions
edsrzf
💎
108
6ms
5 days ago
Tower of Hanoi
JayXon
💎
52
5ms
6 days ago
Tower of Hanoi
Steffan153
🥈
53
5ms
6 days ago
Tower of Hanoi
msbranicky
97
5ms
6 days ago
Tower of Hanoi
helbling
98
5ms
6 days ago
Tower of Hanoi
Openstreetmapler
192
5ms
7 days ago
Rijndael S-box
Steffan153
🥇
145
5ms
7 days ago
Partition Numbers
pardouin
61
6ms
7 days ago
Niven Numbers
pardouin
43
5ms
7 days ago
Fibonacci
pardouin
38
5ms
7 days ago
Tower of Hanoi
Seek64
58
5ms
7 days ago
Tower of Hanoi
pardouin
🥉
54
5ms
7 days ago
Tower of Hanoi
KrausRaus
74
5ms
7 days ago
Tower of Hanoi
IISResetMe
90
5ms
7 days ago
Tower of Hanoi
namelessiw
59
5ms
7 days ago
Tower of Hanoi
tomh1012
94
5ms
7 days ago
Tower of Hanoi
retrohun
3,583
5ms
7 days ago
Tower of Hanoi
Yewzir
91
5ms
7 days ago
Tower of Hanoi
primo-ppcg
58
6ms
7 days ago
Tower of Hanoi
KasperKivimaeki
59
5ms
7 days ago
Tower of Hanoi
scpchicken
141
5ms
7 days ago
Tower of Hanoi
emgordon154
71
6ms
7 days ago
Tower of Hanoi
Jacob385
3,582
5ms
7 days ago
Tower of Hanoi
JRaspass
96
5ms
7 days ago
Collatz
FranklinJiaChen
84
6ms
9 days ago
Leap Years
FranklinJiaChen
57
5ms
9 days ago
γ
JOrE20
1,006
4ms
9 days ago
π
JOrE20
1,006
4ms
10 days ago
PalindromemordnilaP
dokutan
283
5ms
10 days ago
Niven Numbers
dokutan
56
5ms
10 days ago
Fizz Buzz
JOrE20
59
5ms
10 days ago
Smith Numbers
emplv
💎
93
711ms
11 days ago
Abundant Numbers
tsschepens
84
5ms
13 days ago
Odious Numbers (Long)
dokutan
51
4ms
13 days ago
Evil Numbers (Long)
dokutan
52
4ms
13 days ago
Odious Numbers
dokutan
47
4ms
13 days ago
Evil Numbers
dokutan
49
5ms
13 days ago
Levenshtein Distance
JOrE20
🥇
56
5ms
13 days ago
Intersection
xsot
💎
123
5ms
15 days ago
CSS Colors
aksyristos
3,550
5ms
15 days ago
Pangram Grep
sean-niemann
66
7ms
16 days ago
Arrows
edsrzf
🥈
90
7ms
17 days ago
ln 2
JOrE20
1,008
20ms
18 days ago
Van Eck Sequence
JOrE20
2,560
4ms
18 days ago
Pangram Grep
DialFrost
73
5ms
19 days ago
Partition Numbers
Steffan153
🥇
57
6ms
20 days ago
ROT13
Steffan153
🥇
40
5ms
20 days ago
Leap Years
JayXon
🥈
47
5ms
21 days ago
Fractions
Steffan153
70
16ms
22 days ago
Tutorial
elgan65536
95
5ms
25 days ago
ln 2
Steffan153
🥇
93
1,201ms
26 days ago
Catalan’s Constant
Steffan153
🥉
124
1,347ms
26 days ago
Card Number Validation
Steffan153
🥈
81
12ms
26 days ago
PalindromemordnilaP
Steffan153
🥉
74
4ms
26 days ago
Partition Numbers
sean-niemann
🥉
59
5ms
8 Feb 2026
United States
JOrE20
953
5ms
8 Feb 2026
Levenshtein Distance
snoozingnewt
61
5ms
8 Feb 2026
Intersection
emplv
🥈
124
5ms
7 Feb 2026
Polygon Triangulations
targrik
216
9ms
6 Feb 2026
CSS Colors
tomh1012
892
5ms
5 Feb 2026
Multitap Input
edsrzf
💎
110
262ms
5 Feb 2026
Tutorial
FortuiteMan
168
5ms
3 Feb 2026
Fibonacci
sean-niemann
🥇
34
5ms
3 Feb 2026
Tutorial
StefanHabel
95
6ms
1 Feb 2026
τ
JOrE20
1,009
4ms
1 Feb 2026
Multitap Input
dokutan
412
5ms
1 Feb 2026
PalindromemordnilaP
edsrzf
🥈
72
4ms
31 Jan 2026
Gijswijt’s Sequence
sean-niemann
🥈
86
958ms
31 Jan 2026
Multitap Input
blaztoma
🥈
113
9ms
31 Jan 2026
99 Bottles of Beer
brunoabpinto
251
5ms
30 Jan 2026