The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 23 hours. Why not try and solve them ahead of time?
Arrows in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous 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 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 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 Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 481st MeWhenI 🇻🇦 663 86 187ms 31 Jan 2023 482nd targrik 662 121 7ms 27 Aug 2025 483rd StefanHabel 🇨🇦 662 144 13ms 14 Nov 2022 483rd codingisgreatbutiamnot 662 144 11ms 24 Aug 2024 483rd FortuiteMan 🇫🇷 662 144 11ms 1 Nov 2025 486th adyache 🇺🇸 662 163 7ms 5 Jun 2023 487th MWI-polygolf 661 169 171ms 6 Dec 2023 488th Andriamanitra 🇫🇮 660 104 49ms 1 Sep 2022 489th jaredtrh 658 145 14ms 12 Sep 2021 489th inverseLorentz 🇦🇺 658 145 15ms 19 Oct 2023 491st The3gs 658 207 174ms 28 Nov 2024 492nd Shanethegamer 🇺🇸 655 99 3ms 19 Dec 2021 493rd Shanethegamer 🇺🇸 654 117 19ms 9 Jul 2022 494th BREMAUCY 🇫🇷 653 146 10ms 26 Dec 2025 495th dokutan 649 131 3ms 5 Nov 2025 496th wh3n3v3r 🇨🇿 649 147 15ms 18 Nov 2024 497th ovs-code 🇩🇪 648 136 4ms 27 Sep 2024 498th c0d3-4-F00d 🇩🇪 643 132 13ms 22 Sep 2021 499th MeWhenI 🇻🇦 641 187 20ms 17 Nov 2021 500th Troon 640 149 11ms 16 Dec 2024 501st BREMAUCY 🇫🇷 638 203 119ms 28 Dec 2025 502nd adamnielson42 🇺🇸 636 150 14ms 22 Aug 2023 502nd Anonymousellama21 636 150 12ms 7 Mar 2024 504th snoozingnewt 🇨🇦 635 176 134ms 10 Dec 2025 505th the-zammers 635 234 157ms 15 Oct 2023 506th KatieLG 🇬🇧 634 132 610ms 30 Sep 2025 507th mousetail 🇳🇱 633 83 2ms 13 Dec 2022 508th Natanaelel 🇸🇪 633 134 13ms 3 Sep 2021 509th snoozingnewt 🇨🇦 628 141 79ms 10 Dec 2025 510th mossprescott 628 152 14ms 18 Jan 2023 511th tobeannouncd 627 237 153ms 5 Jan 2024 512th hemphen 626 153 486ms 30 Aug 2022 513th CedricGebistorf 619 154 23ms 10 Mar 2022 513th ndren 619 154 14ms 3 Aug 2025 515th janbehrens 🇩🇪 618 177 81ms 20 Nov 2022 516th djeedjay 🇳🇱 615 140 2ms 5 Sep 2021 517th msbranicky 615 155 24ms 31 Aug 2023 518th commandz0 🇺🇸 611 156 14ms 4 Sep 2022 518th annaproxy 611 156 13ms 29 Nov 2022 518th andrewjc2000 611 156 11ms 24 Jun 2025 521st InigoK 🇺🇸 608 157 23ms 10 Jul 2023 522nd MeWhenI 🇻🇦 607 126 22ms 18 Nov 2023 523rd BlankSpruce 604 158 10ms 31 Aug 2025 524th albanian-laundromat 601 124 2,054ms 29 Sep 2025 525th neihousaigaai 600 159 13ms 5 Apr 2025 526th annaproxy 599 200 20ms 29 Nov 2022 527th MWI-polygolf 597 82 46ms 6 Dec 2023 528th janbehrens 🇩🇪 597 142 13ms 17 Jun 2023 529th MWI-polygolf 597 158 6ms 7 Dec 2023 530th janbehrens 🇩🇪 597 171 517ms 24 Mar 2022 531st MeWhenI 🇻🇦 596 148 4ms 2 Oct 2022 532nd vishwathg 596 160 15ms 12 Oct 2023 533rd emgordon154 595 199 4ms 4 Sep 2025 534th dokutan 593 180 476ms 7 Nov 2025 535th CatsAreFluffy 592 185 66ms 30 Dec 2022 536th jgbaldwinbrown 590 146 2ms 21 Jul 2022 537th FlorianCassayre 🇫🇷 589 162 13ms 24 Sep 2023 538th h3ra993huskp 🇯🇵 589 191 860ms 30 Nov 2025 539th Shanethegamer 🇺🇸 588 97 208ms 8 Dec 2021 540th dokutan 587 127 2,008ms 14 Dec 2025 541st c0d3-4-F00d 🇩🇪 586 147 2ms 5 Dec 2021 542nd commandz0 🇺🇸 585 143 741ms 1 Sep 2025 543rd lelbal 582 164 14ms 23 Sep 2025 544th janbehrens 🇩🇪 581 165 469ms 21 Nov 2021 545th namelessiw 578 165 17ms 15 Jan 2024 545th Just4FunCoder 578 165 11ms 18 Jun 2025 545th Lv0Sys 🇵🇱 578 165 11ms 20 Feb 2026 548th voytxt 🇨🇿 577 147 15ms 12 Apr 2025 549th dokutan 577 226 8ms 4 May 2024 550th janbehrens 🇩🇪 576 139 6ms 17 Jun 2023 551st Yewzir 🇧🇪 575 166 13ms 15 Feb 2024 552nd MeWhenI 🇻🇦 574 155 4ms 13 Aug 2024 553rd elgan65536 🇺🇸 574 237 387ms 5 Mar 2024 554th BREMAUCY 🇫🇷 573 146 569ms 26 Dec 2025 555th Elkfoot2 573 148 12ms 25 Jan 2026 556th adoxography 572 120 51ms 28 Sep 2021 557th kmathis22 571 197 842ms 5 Dec 2025 558th jakobkordez 🇸🇮 568 168 46ms 28 Nov 2022 558th dokutan 568 168 43ms 4 Feb 2026 560th olleicua 🇺🇸 567 121 37ms 24 Feb 2024 First Prev 481–560 of 1,322 Next Last