The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Pernicious Numbers (Long) 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 795th AforAmpere 731 68 17ms 20 Sep 2023 795th Simpos 731 68 25ms 24 Oct 2023 795th mikehanus 731 68 19ms 22 Nov 2023 795th chartung17 731 68 17ms 31 Dec 2023 795th mathisfun271 731 68 24ms 13 Feb 2024 795th moustave 731 68 18ms 12 Nov 2024 807th Steffan153 🇫🇮 731 106 34ms 14 Jan 2023 808th MeWhenI 🇻🇦 730 57 339ms 14 Feb 2023 808th masflam 730 57 280ms 21 Jun 2024 810th GrayJoKing 🇦🇺 730 61 147ms 31 Aug 2024 811th FortuiteMan 🇫🇷 730 105 255ms 28 Jan 2026 812th dokutan 727 33 36ms 20 Oct 2024 813th Chinay-Domitrix 🇺🇸 727 71 2,584ms 2 Apr 2025 814th annaproxy 727 85 243ms 22 Nov 2022 814th Natanaelel 🇸🇪 727 85 263ms 27 Apr 2025 816th DialFrost 🇸🇬 726 73 4ms 31 Dec 2025 817th emgordon154 726 119 301ms 19 Mar 2025 818th jared-hughes 725 61 15ms 20 Nov 2022 818th janbehrens 🇩🇪 725 61 14ms 20 Nov 2022 818th tayloia 🇬🇧 725 61 17ms 9 Jan 2023 818th iczelia 🇩🇪 725 61 13ms 5 Nov 2025 822nd msbranicky 724 63 432ms 16 Jan 2024 823rd Shanethegamer 🇺🇸 724 73 39ms 18 Dec 2023 823rd steffan-polygolf 724 73 24ms 7 Mar 2024 825th primo-ppcg 🇹🇭 721 43 382ms 20 Nov 2022 826th snoozingnewt 🇨🇦 720 68 126ms 8 Oct 2023 826th rboath 720 68 2,090ms 11 Dec 2024 828th juliusgeo 720 69 16ms 13 Jan 2023 828th jhu04 720 69 18ms 18 Jan 2024 828th ImpressedByRocks 720 69 17ms 15 Nov 2024 831st prplz 🇦🇺 718 86 243ms 16 Jan 2023 832nd alemelis 717 58 422ms 29 Aug 2024 833rd dokutan 717 72 2,465ms 15 Dec 2025 834th Alex-x90 🇺🇸 716 74 4ms 20 Nov 2022 834th jared-hughes 716 74 4ms 20 Nov 2022 836th edsrzf 🇳🇿 716 82 23ms 9 Sep 2025 837th MeWhenI 🇻🇦 715 36 313ms 30 Dec 2023 838th syntax-rules 715 75 52ms 15 May 2023 839th Alex-x90 🇺🇸 713 62 18ms 14 Jan 2023 839th m-tkach 🇺🇦 713 62 15ms 20 Mar 2023 839th emgordon154 713 62 15ms 19 Mar 2025 839th Yax42 🇫🇷 713 62 14ms 6 Sep 2025 843rd Steffan153 🇫🇮 712 65 17ms 13 Feb 2026 844th sean-niemann 🇺🇸 711 87 42ms 21 Apr 2023 845th primo-ppcg 🇹🇭 710 40 224ms 20 Nov 2022 845th trist224 🇫🇷 710 40 175ms 28 Nov 2022 845th fuzzylojik-golf 🇺🇸 710 40 177ms 21 Aug 2025 848th jhpaques 🇫🇷 710 70 17ms 30 Nov 2022 848th michelebastione 🇮🇹 710 70 17ms 7 Dec 2022 848th Skwerl23 710 70 19ms 5 Feb 2023 848th celiendonze 🇨🇭 710 70 18ms 21 Apr 2023 848th epic-programmer-guy 710 70 18ms 20 Dec 2023 848th Stockoh 🇫🇷 710 70 264ms 24 Apr 2024 848th CutSandstone 710 70 16ms 5 Jul 2024 848th Andrey135296 710 70 17ms 25 Oct 2024 848th Emutis 🇱🇹 710 70 18ms 27 Oct 2024 857th brimstonetrader 710 87 282ms 24 Dec 2023 858th Yewzir 🇧🇪 709 122 288ms 12 Feb 2024 859th Irratix 🇳🇱 706 75 4ms 14 Jan 2023 859th Vinterion 706 75 4ms 19 Jul 2024 861st janbehrens 🇩🇪 704 90 415ms 17 Apr 2025 862nd MeWhenI 🇻🇦 703 123 285ms 9 Apr 2024 863rd msbranicky 703 161 1,703ms 16 Sep 2025 864th Shanethegamer 🇺🇸 702 82 145ms 22 Nov 2022 864th snoozingnewt 🇨🇦 702 82 139ms 13 Oct 2025 866th yzhs 🇩🇪 702 88 195ms 26 Jun 2023 867th CheeseCake628 🇳🇴 701 65 421ms 18 Oct 2025 868th Yewzir 🇧🇪 701 80 111ms 12 Feb 2024 869th Fishron 700 71 19ms 29 Nov 2022 869th Jacob385 700 71 19ms 18 Apr 2024 869th wobblybits 700 71 18ms 29 Aug 2025 869th dokutan 700 71 42ms 18 Nov 2025 873rd RYNO8 697 76 3ms 20 Aug 2023 874th Shanethegamer 🇺🇸 697 77 53ms 30 Nov 2022 875th msbranicky 697 124 289ms 3 Oct 2023 876th CaedenHarper 🇨🇦 695 99 600ms 3 Oct 2025 877th msbranicky 693 60 329ms 15 Jan 2024 878th Shanethegamer 🇺🇸 692 41 155ms 19 Nov 2022 878th prplz 🇦🇺 692 41 208ms 19 Nov 2022 878th scpchicken 🇵🇼 692 41 181ms 20 Nov 2022 First Prev 801–880 of 1,870 Next Last