The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 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 561st JohandeRuiter 🇳🇱 802 82 2ms 26 Nov 2023 561st fuzzylojik-golf 🇺🇸 802 82 1ms 6 Jul 2025 563rd clockworknazo 799 81 3ms 30 Oct 2022 564th Lydxn 🇨🇦 798 99 2ms 11 Oct 2023 565th rucin93 🇵🇱 797 66 141ms 5 Jan 2025 566th somebody1234 797 88 4ms 20 Nov 2018 567th Shanethegamer 🇺🇸 796 83 139ms 12 May 2023 567th ovs-code 🇩🇪 796 83 141ms 20 May 2023 569th HPWiz 🇳🇿 795 68 11ms 30 Aug 2022 569th 4atj 795 68 11ms 30 Jun 2025 571st jared-hughes 793 36 33ms 23 Sep 2021 571st 4hg 🇺🇸 793 36 34ms 11 Mar 2025 573rd jared-hughes 792 71 9ms 3 Aug 2022 574th pardouin 🇫🇷 792 118 313ms 22 Oct 2024 575th acotis 791 90 129ms 23 Apr 2025 575th kumavale 791 90 134ms 9 Sep 2025 577th MeWhenI 🇻🇦 790 54 1,195ms 12 May 2023 578th DialFrost 🇸🇬 790 100 2ms 18 Nov 2025 579th m-tkach 🇺🇦 790 115 27ms 18 Jan 2024 580th MeWhenI 🇻🇦 789 48 3ms 12 Aug 2024 580th DialFrost 🇸🇬 789 48 4ms 16 Aug 2024 580th emgordon154 789 48 3ms 16 Aug 2024 580th Shanethegamer 🇺🇸 789 48 3ms 25 May 2025 580th snoozingnewt 🇨🇦 789 48 3ms 30 Nov 2025 585th Yewzir 🇧🇪 788 89 5ms 6 Feb 2024 586th GalladeGuy 🇺🇸 787 82 2ms 21 May 2020 587th Bubbler-4 787 84 121ms 17 Jan 2019 587th xnor-gate 787 84 138ms 3 Jan 2022 589th DialFrost 🇸🇬 786 119 310ms 26 Dec 2024 590th IAGOAG 785 47 128ms 25 Jun 2018 590th somebody1234 785 47 104ms 9 Dec 2018 590th elisherer 🇮🇱 785 47 114ms 13 Apr 2019 590th o0lit3 🇺🇸 785 47 129ms 10 Jul 2020 590th rucin93 🇵🇱 785 47 122ms 7 Sep 2020 590th prplz 🇦🇺 785 47 118ms 19 Dec 2020 590th BBoehm 🇩🇪 785 47 100ms 30 Dec 2020 590th olivermrose 🇺🇸 785 47 119ms 20 Sep 2021 590th krcs 🇵🇱 785 47 125ms 21 Apr 2022 590th MeWhenI 🇻🇦 785 47 124ms 4 Aug 2022 590th trist224 🇫🇷 785 47 121ms 28 Nov 2022 590th neel11235813 785 47 127ms 3 Feb 2023 602nd MeWhenI 🇻🇦 785 74 2ms 9 Sep 2022 602nd inventshah 785 74 2ms 9 Sep 2022 602nd GrayJoKing 🇦🇺 785 74 2ms 10 Sep 2022 602nd Yewzir 🇧🇪 785 74 2ms 22 Dec 2023 602nd sean-niemann 🇺🇸 785 74 2ms 8 Oct 2024 602nd albanian-laundromat 785 74 2ms 24 Jun 2025 608th Yewzir 🇧🇪 784 72 120ms 28 Mar 2024 609th msbranicky 783 64 427ms 17 Jan 2024 609th KatieLG 🇬🇧 783 64 380ms 28 Oct 2024 609th Babafaba 783 64 409ms 17 Nov 2025 612th Bonjour27891 🇻🇳 783 69 10ms 14 Jul 2022 612th KasperKivimaeki 🇫🇮 783 69 10ms 17 Dec 2025 614th sisyphus-ppcg 🇦🇺 783 84 1ms 23 Mar 2022 614th namelessiw 783 84 1ms 19 Jul 2024 616th verticallity 783 91 128ms 6 Apr 2022 616th prplz 🇦🇺 783 91 130ms 30 Apr 2022 616th emgordon154 783 91 137ms 24 Feb 2025 616th Steffan153 🇫🇮 783 91 123ms 16 Feb 2026 620th duckyluuk 🇳🇱 782 72 4ms 16 Dec 2024 621st SirBogman 🇺🇸 781 32 2ms 8 Feb 2023 621st DialFrost 🇸🇬 781 32 2ms 3 Feb 2024 621st bstrat 781 32 2ms 11 Jun 2024 621st edsrzf 🇳🇿 781 32 3ms 4 days ago 625th kozgera 781 72 9ms 26 Mar 2021 626th ovs-code 🇩🇪 780 83 4ms 7 Feb 2023 627th inventshah 779 91 58ms 27 Jan 2023 628th MeWhenI 🇻🇦 779 93 36ms 28 Jun 2022 629th DialFrost 🇸🇬 778 85 142ms 6 Aug 2024 630th GoateSo 777 83 2ms 14 Aug 2023 631st Yewzir 🇧🇪 776 58 5ms 14 Dec 2023 631st dokutan 776 58 6ms 8 May 2024 631st Shanethegamer 🇺🇸 776 58 6ms 18 Aug 2024 631st emgordon154 776 58 7ms 5 Dec 2024 631st edsrzf 🇳🇿 776 58 6ms 4 Mar 2025 631st kg583 🇺🇸 776 58 6ms 30 Jul 2025 631st snoozingnewt 🇨🇦 776 58 7ms 30 Nov 2025 638th dokutan 774 75 2ms 27 Mar 2024 639th lynn 774 85 1ms 2 Oct 2021 639th jared-hughes 774 85 1ms 30 Mar 2022 First Prev 561–640 of 3,184 Next Last