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 chars. 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 Chars Time Submitted 632nd Mabeloid 🇳🇴 569 127 11ms 7 Sep 2024 632nd CaedenHarper 🇨🇦 569 127 13ms 7 Nov 2024 632nd wuduculfre 569 127 13ms 29 Jul 2025 632nd solisolu 569 127 12ms 25 Nov 2025 645th SteveHales 569 154 93ms 20 Oct 2025 646th MeWhenI 🇻🇦 568 155 4ms 13 Aug 2024 647th Michiocre 567 144 13ms 20 Feb 2024 648th MeWhenI 🇻🇦 565 86 187ms 31 Jan 2023 649th Jacob385 565 192 655ms 28 Oct 2025 650th KatieLG 🇬🇧 565 208 3ms 7 Oct 2021 651st CaedenHarper 🇨🇦 564 120 182ms 23 Aug 2025 652nd jacklynnepenick 564 128 15ms 28 Aug 2021 652nd nstearns96 🇬🇧 564 128 14ms 22 Jan 2023 652nd wuzekai518 564 128 14ms 28 Jun 2024 652nd lelbal 564 128 11ms 22 Sep 2025 656th MiffOttah 564 158 501ms 6 Oct 2024 657th MiffOttah 563 145 14ms 6 Oct 2024 658th dokutan 563 168 43ms 4 Feb 2026 659th Yewzir 🇧🇪 563 215 385ms 3 Jan 2024 660th mousetail 🇳🇱 562 83 2ms 13 Dec 2022 661st janbehrens 🇩🇪 562 193 710ms 10 Jul 2023 662nd Yewzir 🇧🇪 562 216 3ms 18 Jan 2024 663rd MeWhenI 🇻🇦 562 241 209ms 17 Feb 2022 664th JunkIce 561 118 564ms 3 Dec 2024 665th snoozingnewt 🇨🇦 561 135 21ms 10 Dec 2025 666th dokutan 561 180 476ms 7 Nov 2025 667th jaredtrh 560 129 14ms 11 Sep 2021 667th guilhem-roy 🇫🇷 560 129 15ms 9 May 2022 667th MaxElf999 560 129 12ms 19 Sep 2022 667th DrPiranoid 560 129 23ms 28 Sep 2022 667th PhysicDev 🇫🇷 560 129 13ms 4 Oct 2022 667th cykim8811 560 129 11ms 10 Jul 2024 667th andrewjc2000 560 129 14ms 26 Feb 2025 667th raymur 560 129 10ms 14 Jul 2025 667th vgamula 🇺🇦 560 129 11ms 15 Jul 2025 667th Alex-Huggett 🇬🇧 560 129 14ms 14 Sep 2025 667th nemoyatpeace 560 129 10ms 9 Jan 2026 678th jared-hughes 558 109 43ms 25 Sep 2021 679th janbehrens 🇩🇪 557 136 12ms 29 Aug 2021 680th CaedenHarper 🇨🇦 556 119 535ms 10 Dec 2024 681st rowboat1 556 130 14ms 11 Jun 2022 681st georgehulme 556 130 13ms 5 Oct 2022 683rd jgbaldwinbrown 556 146 2ms 21 Jul 2022 684th CaedenHarper 🇨🇦 555 218 350ms 2 Nov 2025 685th Andriamanitra 🇫🇮 552 104 49ms 1 Sep 2022 686th c0d3-4-F00d 🇩🇪 552 147 2ms 5 Dec 2021 687th scpchicken 🇵🇼 551 107 5ms 10 Mar 2023 688th dionjw 551 131 13ms 22 Mar 2022 688th za3k 551 131 14ms 12 Oct 2022 688th mossprescott 551 131 13ms 18 Jan 2023 688th SB-945 551 131 14ms 14 Jul 2023 688th suhren 551 131 13ms 1 Oct 2023 693rd CatsAreFluffy 551 185 66ms 30 Dec 2022 694th MeWhenI 🇻🇦 551 437 10ms 28 Nov 2023 695th Yewzir 🇧🇪 550 153 2ms 19 Nov 2025 696th p-vf 🇨🇭 550 162 435ms 24 Feb 2022 696th SpareManiKatti 550 162 491ms 7 Apr 2025 698th snoozingnewt 🇨🇦 550 178 7ms 10 Dec 2025 699th sergioabreu-g 549 247 234ms 20 Jun 2025 700th ComradeSquirrel 548 149 12ms 2 days ago 701st Shanethegamer 🇺🇸 547 117 8ms 5 Nov 2022 702nd fuzzylojik-golf 🇺🇸 547 121 610ms 6 Jul 2025 703rd CedricGebistorf 547 132 12ms 7 Feb 2022 703rd FlorianCassayre 🇫🇷 547 132 14ms 29 Oct 2022 703rd PaulMWeiser 547 132 14ms 8 Mar 2023 703rd yuchuehw 547 132 14ms 21 Jan 2024 703rd RaBa21 🇭🇺 547 132 13ms 11 Aug 2025 708th KatieLG 🇬🇧 546 138 2,279ms 2 Sep 2021 709th retrohun 546 185 379ms 27 days ago 710th tomh1012 545 150 14ms 23 Aug 2021 710th JTH1999 545 150 13ms 11 Apr 2023 712th snoozingnewt 🇨🇦 543 121 200ms 10 Dec 2025 713th bastienvoirin 🇫🇷 543 133 13ms 14 Sep 2021 713th adoxography 543 133 11ms 28 Sep 2021 713th martinnorling 🇸🇪 543 133 14ms 25 Feb 2022 716th Shnapster 543 164 487ms 28 Sep 2023 717th johanrosenson 541 151 13ms 8 Dec 2021 718th ovs-code 🇩🇪 540 136 4ms 27 Sep 2024 719th janbehrens 🇩🇪 540 165 469ms 21 Nov 2021 720th zbreit 🇺🇸 539 134 14ms 6 May 2023 First Prev 641–720 of 1,317 Next Last
