The
Connect Four
hole will go live in approximately
2 days
. Why not try and solve it ahead of time?
Recent Solutions
Achievements
Cheevos
Golfers
Solutions
All Holes
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Alphabetic Numbers
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)
Taxicab Numbers
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
Crossword
CSS Colors (Inverse)
CSS Grid
Dragon Curve
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
Huffman Encoder
NFA Simulator
Nim
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Turtle
Tutorial
Ulam Sequence
All Languages
><>
ALGOL 68
ArkScript
Assembly
AWK
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brainfuck
C
C#
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Crystal
D
Dart
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iogii
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Janet
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jq
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VimL
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Egel
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Hy
Knight
Lily
Luau
Odin
Picat
Qore
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Rebol
Rexx
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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
iogii
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
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)
Alphabetic Numbers
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)
Taxicab Numbers
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
Crossword
CSS Colors (Inverse)
CSS Grid
Dragon Curve
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
Huffman Encoder
NFA Simulator
Nim
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Turtle
Tutorial
Ulam Sequence
Hole
Golfer
Bytes
Time
Submitted
Pernicious Numbers
kcinnu
126
1,786ms
45 mins ago
Pernicious Numbers (Long)
kcinnu
140
1,781ms
53 mins ago
Connect Four
kcinnu
417
1,810ms
73 mins ago
ROT13
kcinnu
🥈
194
1,720ms
2 hours ago
Day of Week
ericlangedijk
400
1,752ms
6 hours ago
Calendar
ericlangedijk
💎
473
1,674ms
7 hours ago
Ascending Primes
kcinnu
🥈
173
2,336ms
15 hours ago
λ
JayXon
💎
269
2,157ms
19 hours ago
λ
kcinnu
🥈
271
2,415ms
19 hours ago
Kolakoski Sequence
JayXon
🥇
130
1,653ms
22 hours ago
Fizz Buzz
kcinnu
🥉
177
1,770ms
22 hours ago
Foo Fizz Buzz Bar
kcinnu
🥇
208
1,701ms
22 hours ago
Set
ericlangedijk
🥈
352
1,646ms
25 hours ago
Collatz
kcinnu
🥉
160
1,663ms
29 hours ago
Poker
Yewzir
💎
744
2,065ms
37 hours ago
Niven Numbers
albanian-laundromat
🥇
121
1,670ms
39 hours ago
Kolakoski Sequence
kcinnu
🥇
130
1,780ms
43 hours ago
Niven Numbers (Long)
kcinnu
143
1,666ms
43 hours ago
Sudoku
ericlangedijk
🥉
1,019
1,895ms
2 days ago
Tutorial
JOrE20
197
2,071ms
2 days ago
Taxicab Numbers
kcinnu
💎
186
2,238ms
2 days ago
Leap Years
denkyuu1
326
1,698ms
2 days ago
Sudoku
Yewzir
🥈
910
1,833ms
2 days ago
Fizz Buzz
JayXon
🥇
170
1,713ms
2 days ago
Fizz Buzz
Yewzir
🥇
170
1,660ms
2 days ago
Sierpiński Triangle
kcinnu
🥈
130
1,653ms
2 days ago
Rule 110
kcinnu
🥇
178
1,679ms
2 days ago
π
Ralac07
1,113
1,690ms
2 days ago
Sudoku (Fill-in)
kcinnu
💎
410
1,813ms
2 days ago
Sudoku
kcinnu
💎
784
2,040ms
2 days ago
Fibonacci
Andrey2001
142
1,618ms
3 days ago
Tutorial
kcinnu
197
2,129ms
3 days ago
Tutorial
DialFrost
197
2,273ms
3 days ago
Quine
JayXon
🥇
76
1,660ms
3 days ago
Odious Numbers (Long)
JayXon
🥇
119
1,703ms
3 days ago
Tongue-twisters
kcinnu
518
1,714ms
3 days ago
Odious Numbers (Long)
kcinnu
🥇
119
1,646ms
4 days ago
Evil Numbers (Long)
kcinnu
🥇
119
1,905ms
4 days ago
Abundant Numbers
kcinnu
🥉
144
1,781ms
4 days ago
Abundant Numbers (Long)
Steffan153
🥇
145
1,831ms
4 days ago
Abundant Numbers (Long)
JayXon
🥇
145
1,726ms
4 days ago
Abundant Numbers (Long)
kcinnu
🥇
145
1,960ms
4 days ago
ROT13
Yewzir
224
1,853ms
4 days ago
φ
Yewzir
206
1,892ms
4 days ago
√2
Yewzir
197
1,606ms
4 days ago
𝑒
Yewzir
247
1,707ms
4 days ago
Continued Fractions
Yewzir
🥇
346
1,654ms
5 days ago
τ
kcinnu
🥉
173
1,683ms
5 days ago
99 Bottles of Beer
ericlangedijk
🥈
460
1,702ms
5 days ago
Christmas Trees
ericlangedijk
244
1,691ms
5 days ago
Divisors
ericlangedijk
152
1,695ms
5 days ago
Arabic to Roman
ericlangedijk
🥉
369
1,735ms
5 days ago
Rule 110
Yewzir
294
1,617ms
5 days ago
Fractions
Yewzir
🥈
271
1,643ms
5 days ago
π
kcinnu
🥉
171
1,677ms
5 days ago
φ
kcinnu
🥇
142
1,623ms
5 days ago
√2
kcinnu
🥇
140
1,683ms
5 days ago
𝑒
kcinnu
🥇
155
1,683ms
5 days ago
brainfuck
kcinnu
💎
338
1,756ms
5 days ago
Reverse Polish Notation
kcinnu
💎
339
1,712ms
5 days ago
Recamán
kcinnu
🥇
157
1,764ms
6 days ago
Reverse Polish Notation
Yewzir
🥉
390
1,674ms
6 days ago
Gray Code Decoder
kcinnu
🥇
185
1,678ms
6 days ago
Gray Code Encoder
kcinnu
🥇
188
1,652ms
6 days ago
99 Bottles of Beer
annaproxy
🥉
462
1,666ms
7 days ago
Prime Numbers
kcinnu
🥉
131
1,621ms
7 days ago
Prime Numbers (Long)
kcinnu
🥇
136
1,712ms
7 days ago
PalindromemordnilaP
DialFrost
🥈
297
1,644ms
7 days ago
Alphabetic Numbers
CaedenHarper
4,957
1,774ms
7 days ago
Leap Years
albanian-laundromat
130
1,712ms
8 days ago
Fibonacci
albanian-laundromat
140
1,786ms
8 days ago
Ordinal Numbers
Yewzir
🥉
239
1,678ms
9 days ago
Spelling Numbers
Yewzir
🥇
613
1,809ms
9 days ago
Multitap Input
scpchicken
🥉
260
1,810ms
9 days ago
Pascal’s Triangle
Steffan153
🥇
151
1,786ms
9 days ago
Multitap Input
Yewzir
💎
250
1,706ms
9 days ago
Pascal’s Triangle
Yewzir
153
1,647ms
10 days ago
Day of Week
Yewzir
🥉
365
1,625ms
10 days ago
Tutorial
Yewzir
197
2,210ms
10 days ago
Tutorial
MeWhenI
197
2,455ms
10 days ago
Gray Code Decoder
Yewzir
195
1,692ms
11 days ago
Scrambled Sort
Yewzir
💎
493
1,652ms
11 days ago
Polyominoes
scpchicken
💎
636
1,709ms
11 days ago
Polyominoes
CaedenHarper
🥈
787
1,712ms
11 days ago
Hilbert Curve
scpchicken
💎
525
1,678ms
11 days ago
Hilbert Curve
CaedenHarper
🥈
646
1,891ms
11 days ago
Topological Sort
scpchicken
🦄
433
1,786ms
11 days ago
Pangram Grep
zakariamouhid
1,396
1,790ms
12 days ago
Factorial Factorisation
zakariamouhid
1,191
1,762ms
12 days ago
12 Days of Christmas
zakariamouhid
2,812
1,675ms
12 days ago
Pangram Grep
SirBogman
253
1,754ms
13 days ago
Foo Fizz Buzz Bar
SirBogman
270
1,689ms
14 days ago
Fizz Buzz
SirBogman
214
1,715ms
14 days ago
Fibonacci
SirBogman
140
1,700ms
14 days ago
Billiards
emgordon154
💎
351
1,748ms
14 days ago
Tic-tac-toe
Yewzir
277
1,842ms
15 days ago
Tower of Hanoi
Yewzir
159
1,635ms
15 days ago
Fibonacci
scpchicken
140
1,717ms
15 days ago
Quine
prestosilver
🥇
76
1,781ms
16 days ago
Transpose Sentence
Yewzir
267
1,704ms
16 days ago