Recent Solutions
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
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
Morse Decoder
Morse Encoder
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
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
Calendar
Connect Four
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Minesweeper
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Turtle
Tutorial
All Languages
><>
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
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
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Erlang
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
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
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
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Erlang
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
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
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
Morse Decoder
Morse Encoder
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
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
Calendar
Connect Four
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Minesweeper
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Turtle
Tutorial
Hole
Golfer
Chars
Submitted
Fibonacci
jacekwladzinski
63
9 hours ago
Arithmetic Numbers
snoozingnewt
179
15 hours ago
Abundant Numbers
snoozingnewt
139
17 hours ago
Abundant Numbers (Long)
snoozingnewt
139
17 hours ago
Kaprekar Numbers
edsrzf
122
21 hours ago
Evil Numbers (Long)
ian-h-chamberlain
75
23 hours ago
Odious Numbers (Long)
ian-h-chamberlain
74
23 hours ago
Evil Numbers
ian-h-chamberlain
73
23 hours ago
Odious Numbers
ian-h-chamberlain
72
24 hours ago
Pernicious Numbers
snoozingnewt
140
25 hours ago
Pernicious Numbers (Long)
snoozingnewt
146
25 hours ago
Niven Numbers (Long)
jacekwladzinski
128
44 hours ago
Niven Numbers
jacekwladzinski
126
44 hours ago
Fizz Buzz
jacekwladzinski
153
44 hours ago
Odious Numbers (Long)
jacekwladzinski
125
44 hours ago
Odious Numbers
jacekwladzinski
83
44 hours ago
Evil Numbers (Long)
jacekwladzinski
123
45 hours ago
Evil Numbers
jacekwladzinski
121
45 hours ago
Divisors
jacekwladzinski
107
45 hours ago
Trinomial Triangle
dokutan
2,076
4 days ago
Pernicious Numbers
Yax42
112
6 days ago
Scrambled Sort
kg583
🥈
173
6 days ago
Tutorial
ian-h-chamberlain
207
7 days ago
Leap Years
ian-h-chamberlain
127
7 days ago
Trinomial Triangle
DialFrost
🥉
81
8 days ago
Pascal’s Triangle
snoozingnewt
184
8 days ago
Trinomial Triangle
snoozingnewt
283
9 days ago
Fibonacci
ian-h-chamberlain
72
10 days ago
Trinomial Triangle
CaedenHarper
2,076
10 days ago
Sudoku (Fill-in)
edsrzf
💎
244
10 days ago
Niven Numbers
snoozingnewt
164
10 days ago
Niven Numbers (Long)
snoozingnewt
164
10 days ago
Fizz Buzz
ian-h-chamberlain
136
10 days ago
Evil Numbers
kmathis22
132
10 days ago
Prime Numbers (Long)
snoozingnewt
134
11 days ago
Prime Numbers
snoozingnewt
133
11 days ago
Collatz
kmathis22
145
16 days ago
Recamán
snoozingnewt
189
16 days ago
Partition Numbers
snoozingnewt
209
16 days ago
Evil Numbers
InigoK
122
20 days ago
Game of Life
edsrzf
💎
153
21 days ago
π
ChesterJFGould
155
21 days ago
Reversi
kg583
💎
171
22 days ago
99 Bottles of Beer
x-kiana
416
23 days ago
Tutorial
snoozingnewt
63
25 days ago
Odious Numbers (Long)
snoozingnewt
87
25 days ago
Odious Numbers
snoozingnewt
86
25 days ago
Evil Numbers (Long)
snoozingnewt
88
25 days ago
Evil Numbers
snoozingnewt
87
25 days ago
Morse Encoder
dokutan
664
26 days ago
Happy Numbers (Long)
snoozingnewt
205
26 days ago
Happy Numbers
snoozingnewt
205
26 days ago
Quine
snoozingnewt
93
27 days ago
Pernicious Numbers (Long)
edsrzf
73
9 Sep 2025
Sudoku
edsrzf
🥈
807
5 Sep 2025
Evil Numbers (Long)
blaztoma
133
5 Sep 2025
Evil Numbers
blaztoma
131
5 Sep 2025
Inventory Sequence
blaztoma
23,622
4 Sep 2025
𝑒
Jacob385
1,012
3 Sep 2025
brainfuck
kg583
💎
192
3 Sep 2025
Day of Week
edsrzf
💎
159
1 Sep 2025
Hilbert Curve
dokutan
💎
437
28 Aug 2025
Hilbert Curve
CaedenHarper
🥈
2,057
28 Aug 2025
Medal Tally
kg583
💎
159
28 Aug 2025
Inventory Sequence
kg583
🥈
90
27 Aug 2025
λ
duckyluuk
1,012
27 Aug 2025
Evil Numbers
duckyluuk
79
27 Aug 2025
Look and Say
edsrzf
🥉
139
27 Aug 2025
Intersection
kg583
🥈
155
26 Aug 2025
Recamán
kg583
🥇
84
26 Aug 2025
Sierpiński Triangle
edsrzf
🥈
86
22 Aug 2025
Tutorial
Vexxter9
207
21 Aug 2025
Transpose Sentence
edsrzf
💎
144
21 Aug 2025
Medal Tally
edsrzf
🥈
161
19 Aug 2025
Leap Years
edsrzf
🥇
61
19 Aug 2025