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?
Abundant 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 801st frankgraziano 796 198 37ms 12 Aug 2025 802nd WilliamDeBlieck 795 47 78ms 23 days ago 803rd primo-ppcg 🇹🇭 795 92 61ms 18 Jan 2022 803rd MeWhenI 🇻🇦 795 92 64ms 21 Aug 2023 803rd Herbert00709 🇵🇱 795 92 61ms 24 Feb 2024 803rd ovs-code 🇩🇪 795 92 59ms 10 Mar 2025 803rd fuzzylojik-golf 🇺🇸 795 92 60ms 29 May 2025 803rd DialFrost 🇸🇬 795 92 61ms 15 Dec 2025 809th DialFrost 🇸🇬 794 46 1,063ms 10 Oct 2024 810th fuzzylojik-golf 🇺🇸 794 91 446ms 24 Sep 2025 810th dokutan 794 91 398ms 24 Sep 2025 810th Shanethegamer 🇺🇸 794 91 478ms 25 Sep 2025 810th Yewzir 🇧🇪 794 91 376ms 2 Oct 2025 810th snoozingnewt 🇨🇦 794 91 482ms 9 Oct 2025 810th CaedenHarper 🇨🇦 794 91 445ms 19 Oct 2025 810th h3ra993huskp 🇯🇵 794 91 476ms 30 Nov 2025 810th emgordon154 794 91 370ms 9 Feb 2026 810th raphaelimahorn 794 91 377ms 11 days ago 819th GrayJoKing 🇦🇺 792 24 64ms 28 Jul 2022 819th AlephSquirrel 792 24 66ms 30 Dec 2022 819th Shanethegamer 🇺🇸 792 24 68ms 3 Apr 2023 822nd shuding 791 59 9ms 27 Apr 2020 822nd tomh1012 791 59 9ms 21 Aug 2020 822nd meyginix 791 59 10ms 28 Aug 2020 822nd omurakazuaki 🇯🇵 791 59 10ms 9 Feb 2021 822nd Pimentero 🇷🇺 791 59 9ms 2 Apr 2021 822nd dzshn 791 59 10ms 7 Apr 2021 822nd ForkKILLET 🇨🇳 791 59 10ms 22 Jul 2021 822nd Mazn3k 791 59 10ms 9 Sep 2021 822nd shellbertt 🇨🇦 791 59 10ms 30 Nov 2021 822nd Cazka 791 59 9ms 12 Feb 2022 822nd bartvw 791 59 12ms 27 Oct 2022 822nd LukeBridges 🇬🇧 791 59 9ms 28 Nov 2022 822nd weliveinhell 🇭🇹 791 59 9ms 5 Sep 2023 822nd 823126 791 59 10ms 8 Nov 2024 822nd eranws 791 59 10ms 23 Dec 2024 822nd CaedenHarper 🇨🇦 791 59 10ms 25 Jun 2025 822nd daniel-cardone 791 59 10ms 28 Jun 2025 822nd Program-Pi 791 59 11ms 18 days ago 840th KatieLG 🇬🇧 790 57 374ms 28 Oct 2024 840th GolfingSuccess 🇬🇷 790 57 439ms 25 Jan 2025 842nd inventshah 790 61 10ms 8 Aug 2020 842nd rklavin 790 61 10ms 12 Sep 2020 842nd yzhs 🇩🇪 790 61 10ms 25 Oct 2020 842nd GeneralTwi 790 61 10ms 2 May 2022 842nd CarsonChr 🇺🇸 790 61 11ms 18 Sep 2022 842nd dhilman 790 61 10ms 25 Sep 2022 842nd The3gs 790 61 10ms 10 Oct 2022 842nd bricknellj 790 61 10ms 24 Jan 2023 842nd kaptsanovb 790 61 10ms 20 Apr 2023 842nd lynn 790 61 16ms 20 Oct 2023 842nd elgan65536 🇺🇸 790 61 11ms 18 Nov 2023 842nd ridingqwerty 🇺🇸 790 61 10ms 6 Dec 2023 842nd VictorStenvers 🇳🇱 790 61 10ms 29 Jan 2024 842nd ArcticBeat05 790 61 9ms 19 Sep 2024 842nd Artemis21 🇬🇧 790 61 11ms 10 Jan 2025 842nd addmai 790 61 10ms 31 Jul 2025 842nd madeforlosers 790 61 10ms 11 Nov 2025 842nd bizy-coder 790 61 10ms 3 Dec 2025 860th Shanethegamer 🇺🇸 790 62 2ms 31 Oct 2022 861st piebot3000 790 72 125ms 14 Sep 2023 861st glassala 790 72 116ms 28 Oct 2024 863rd Eolu 789 84 130ms 25 Jan 2022 863rd verticallity 789 84 129ms 7 Apr 2022 863rd Re-Adventures 🇮🇳 789 84 122ms 9 Jun 2023 863rd elgan65536 🇺🇸 789 84 132ms 21 Sep 2023 863rd drabart 🇵🇱 789 84 131ms 15 Dec 2023 863rd Aurel300 🇨🇭 789 84 128ms 6 Jun 2024 863rd wuzekai518 789 84 126ms 5 Aug 2024 863rd edsrzf 🇳🇿 789 84 135ms 16 Nov 2024 863rd luuumine 🇫🇷 789 84 127ms 18 Nov 2025 872nd kkoenig 789 109 266ms 5 Jan 2024 873rd GrayJoKing 🇦🇺 788 58 514ms 1 Dec 2021 873rd jared-hughes 788 58 502ms 17 Jul 2022 875th primo-ppcg 🇹🇭 788 61 1,244ms 11 May 2020 875th sean-niemann 🇺🇸 788 61 1,274ms 18 Apr 2025 877th primo-ppcg 🇹🇭 788 89 24ms 10 May 2023 878th DialFrost 🇸🇬 788 200 10ms 13 Aug 2025 879th jipsong 🇩🇪 787 69 104ms 22 Oct 2023 880th Irratix 🇳🇱 787 93 62ms 3 Jan 2022 First Prev 801–880 of 4,397 Next Last