The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Emirp Numbers 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 560th retrohun 802 46 127ms 26 Apr 2019 560th Shanethegamer 🇺🇸 802 46 111ms 20 Mar 2021 563rd JohandeRuiter 🇳🇱 802 82 2ms 26 Nov 2023 563rd fuzzylojik-golf 🇺🇸 802 82 1ms 6 Jul 2025 565th clockworknazo 799 81 3ms 30 Oct 2022 566th Lydxn 🇨🇦 798 99 2ms 11 Oct 2023 567th rucin93 🇵🇱 797 66 141ms 5 Jan 2025 568th somebody1234 797 88 4ms 20 Nov 2018 569th Shanethegamer 🇺🇸 796 83 139ms 12 May 2023 569th ovs-code 🇩🇪 796 83 141ms 20 May 2023 571st HPWiz 🇳🇿 795 68 11ms 30 Aug 2022 571st 4atj 795 68 11ms 30 Jun 2025 573rd jared-hughes 793 36 33ms 23 Sep 2021 573rd 4hg 🇺🇸 793 36 34ms 11 Mar 2025 575th jared-hughes 792 71 10ms 3 Aug 2022 576th pardouin 🇫🇷 792 118 313ms 22 Oct 2024 577th acotis 791 90 125ms 23 Apr 2025 577th kumavale 791 90 127ms 9 Sep 2025 579th MeWhenI 🇻🇦 790 54 1,195ms 12 May 2023 580th DialFrost 🇸🇬 790 100 2ms 18 Nov 2025 581st m-tkach 🇺🇦 790 115 27ms 18 Jan 2024 582nd MeWhenI 🇻🇦 789 48 3ms 12 Aug 2024 582nd DialFrost 🇸🇬 789 48 4ms 16 Aug 2024 582nd emgordon154 789 48 3ms 16 Aug 2024 582nd Shanethegamer 🇺🇸 789 48 3ms 25 May 2025 582nd snoozingnewt 🇨🇦 789 48 3ms 30 Nov 2025 587th Yewzir 🇧🇪 788 89 5ms 6 Feb 2024 588th GalladeGuy 🇺🇸 787 82 2ms 21 May 2020 589th Bubbler-4 787 84 121ms 17 Jan 2019 589th xnor-gate 787 84 138ms 3 Jan 2022 591st DialFrost 🇸🇬 786 119 310ms 26 Dec 2024 592nd IAGOAG 785 47 128ms 25 Jun 2018 592nd somebody1234 785 47 104ms 9 Dec 2018 592nd elisherer 🇮🇱 785 47 114ms 13 Apr 2019 592nd o0lit3 🇺🇸 785 47 129ms 10 Jul 2020 592nd rucin93 🇵🇱 785 47 122ms 7 Sep 2020 592nd prplz 🇦🇺 785 47 118ms 19 Dec 2020 592nd BBoehm 🇩🇪 785 47 100ms 30 Dec 2020 592nd olivermrose 🇺🇸 785 47 119ms 20 Sep 2021 592nd krcs 🇵🇱 785 47 125ms 21 Apr 2022 592nd MeWhenI 🇻🇦 785 47 124ms 4 Aug 2022 592nd trist224 🇫🇷 785 47 121ms 28 Nov 2022 592nd neel11235813 785 47 127ms 3 Feb 2023 604th MeWhenI 🇻🇦 785 74 2ms 9 Sep 2022 604th inventshah 785 74 2ms 9 Sep 2022 604th GrayJoKing 🇦🇺 785 74 2ms 10 Sep 2022 604th Yewzir 🇧🇪 785 74 2ms 22 Dec 2023 604th sean-niemann 🇺🇸 785 74 2ms 8 Oct 2024 604th albanian-laundromat 785 74 2ms 24 Jun 2025 610th Yewzir 🇧🇪 784 72 120ms 28 Mar 2024 611th msbranicky 783 64 427ms 17 Jan 2024 611th KatieLG 🇬🇧 783 64 380ms 28 Oct 2024 611th Babafaba 783 64 409ms 17 Nov 2025 614th Bonjour27891 🇻🇳 783 69 10ms 14 Jul 2022 614th KasperKivimaeki 🇫🇮 783 69 10ms 17 Dec 2025 616th sisyphus-ppcg 🇦🇺 783 84 1ms 23 Mar 2022 616th namelessiw 783 84 1ms 19 Jul 2024 618th verticallity 783 91 124ms 6 Apr 2022 618th prplz 🇦🇺 783 91 144ms 30 Apr 2022 618th emgordon154 783 91 133ms 24 Feb 2025 618th Steffan153 🇫🇮 783 91 136ms 16 Feb 2026 622nd duckyluuk 🇳🇱 782 72 4ms 16 Dec 2024 623rd SirBogman 🇺🇸 781 32 2ms 8 Feb 2023 623rd DialFrost 🇸🇬 781 32 2ms 3 Feb 2024 623rd bstrat 781 32 2ms 11 Jun 2024 623rd edsrzf 🇳🇿 781 32 3ms 9 days ago 627th kozgera 781 72 10ms 26 Mar 2021 628th ovs-code 🇩🇪 780 83 4ms 7 Feb 2023 629th inventshah 779 91 56ms 27 Jan 2023 630th MeWhenI 🇻🇦 779 93 36ms 28 Jun 2022 631st DialFrost 🇸🇬 778 85 142ms 6 Aug 2024 632nd GoateSo 777 83 2ms 14 Aug 2023 633rd Yewzir 🇧🇪 776 58 5ms 14 Dec 2023 633rd dokutan 776 58 6ms 8 May 2024 633rd Shanethegamer 🇺🇸 776 58 6ms 18 Aug 2024 633rd emgordon154 776 58 7ms 5 Dec 2024 633rd edsrzf 🇳🇿 776 58 6ms 4 Mar 2025 633rd kg583 🇺🇸 776 58 6ms 30 Jul 2025 633rd snoozingnewt 🇨🇦 776 58 7ms 30 Nov 2025 640th dokutan 774 75 2ms 27 Mar 2024 First Prev 561–640 of 3,187 Next Last