The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Leyland Numbers in all languages in bytes. 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 Bytes Time Submitted 801st helbling 🇨🇭 721 93 9ms 29 May 2024 802nd albanian-laundromat 720 137 112ms 7 Nov 2025 803rd KatieLG 🇬🇧 719 135 2ms 24 Sep 2021 803rd emgordon154 719 135 2ms 21 Jun 2024 805th roupiq 🇵🇱 719 173 3,059ms 26 Feb 2024 806th vezzick 717 99 14ms 7 Mar 2021 806th TimHuisman1703 717 99 10ms 7 Jan 2022 806th hellwue 717 99 9ms 25 Feb 2022 806th davecame 717 99 10ms 2 Aug 2023 806th Googolplexo 717 99 15ms 4 mins ago 811th Shanethegamer 🇺🇸 717 158 424ms 9 Apr 2025 812th primo-ppcg 🇹🇭 717 171 427ms 29 Aug 2020 813th DialFrost 🇸🇬 716 85 9ms 7 Nov 2025 814th okaponta 716 167 240ms 11 Jan 2024 815th TaserTheFox 🇺🇸 715 79 283ms 1 Jun 2023 816th janbehrens 🇩🇪 714 85 12ms 29 Oct 2021 817th FlyingPenguin223 713 66 43ms 11 Nov 2024 818th neihousaigaai 713 94 9ms 18 Apr 2021 818th emgordon154 713 94 9ms 24 Dec 2021 818th junkondo-jp 713 94 9ms 8 Jun 2024 818th Yax42 🇫🇷 713 94 12ms 5 Sep 2025 818th JOrE20 713 94 13ms 27 Jan 2026 823rd ertz1ertz 713 159 393ms 14 Aug 2024 824th CatsAreFluffy 711 102 50ms 24 Feb 2023 825th stefangimmillaro 710 99 2,926ms 18 Oct 2023 826th EwanSkene 710 100 12ms 3 Sep 2020 826th boxjelly 710 100 11ms 14 Feb 2021 826th PhysicDev 🇫🇷 710 100 10ms 16 Mar 2022 826th wen1now 710 100 10ms 6 Nov 2023 826th Alban-Boissard 710 100 10ms 14 Jun 2025 826th TheZwierzLF 🇵🇱 710 100 10ms 17 Dec 2025 832nd stefangimmillaro 710 139 2,286ms 18 Oct 2023 833rd billings7 🇬🇧 709 160 470ms 22 May 2024 834th DialFrost 🇸🇬 708 137 2ms 9 Mar 2025 835th MeWhenI 🇻🇦 708 210 304ms 9 Feb 2023 836th CatsAreFluffy 707 93 455ms 15 Jan 2024 837th Betuaredead 707 176 2,959ms 13 Jan 2023 838th tayloia 🇬🇧 706 95 10ms 26 May 2022 838th dmrichwa 🇺🇸 706 95 11ms 4 Oct 2022 838th voytxt 🇨🇿 706 95 10ms 17 Jul 2024 841st NewDefectus 🇮🇱 706 134 144ms 18 Feb 2021 842nd michelebastione 🇮🇹 704 161 435ms 20 Jul 2024 843rd jameslindesay 703 101 42ms 25 Feb 2021 843rd galloj 🇨🇿 703 101 11ms 21 Aug 2022 843rd Acky-Acky 703 101 11ms 9 May 2024 846th btjones0 703 170 240ms 31 Dec 2020 847th Lv0Sys 🇵🇱 702 67 38ms 3 Dec 2025 848th MeWhenI 🇻🇦 702 139 544ms 4 Mar 2022 849th Yewzir 🇧🇪 701 64 590ms 28 Feb 2024 850th snoozingnewt 🇨🇦 701 119 8ms 13 Oct 2025 851st snoozingnewt 🇨🇦 700 114 3ms 13 Oct 2025 852nd GolfingSuccess 🇬🇷 700 151 2ms 26 Oct 2023 853rd albanian-laundromat 699 87 3ms 6 Dec 2025 854th HCRitter 🇩🇪 698 81 311ms 31 Oct 2023 855th cywong-amino 🇭🇰 698 96 9ms 7 Oct 2020 855th jared-hughes 698 96 11ms 29 Oct 2021 855th KrausRaus 🇺🇸 698 96 9ms 21 Dec 2021 855th Shanethegamer 🇺🇸 698 96 9ms 10 Mar 2022 855th zakariamouhid 698 96 9ms 21 Jun 2023 855th Maznek 698 96 78ms 10 Jul 2023 855th two-bad 🇬🇧 698 96 10ms 6 Feb 2024 862nd vgamula 🇺🇦 698 167 30ms 25 Jan 2024 863rd lifthrasiir 🇰🇷 697 50 2ms 28 Nov 2024 864th AlephSquirrel 697 107 4ms 20 Apr 2023 865th Shanethegamer 🇺🇸 696 101 4ms 6 Apr 2023 866th findegil 696 102 10ms 26 Aug 2020 866th austinrwarner 696 102 11ms 25 Dec 2020 866th Omega65536 🇩🇪 696 102 16ms 6 Jan 2021 866th jhpaques 🇫🇷 696 102 14ms 29 Jul 2022 866th jamesthekee 696 102 10ms 25 Jan 2025 871st m-tkach 🇺🇦 693 109 1ms 4 Feb 2024 872nd TheZwierzLF 🇵🇱 692 95 447ms 17 Dec 2025 873rd PatrickStephansen 🇿🇦 691 97 9ms 10 Sep 2020 873rd alasdair-greenland 691 97 10ms 19 Nov 2021 873rd nakatchi 691 97 11ms 27 Feb 2024 873rd SadiinsoSnowfall 🇫🇷 691 97 10ms 7 Mar 2024 877th DialFrost 🇸🇬 691 139 189ms 10 Nov 2025 878th atazzam 🇺🇸 690 103 14ms 2 Apr 2022 878th vishwathg 690 103 10ms 21 Aug 2022 878th fredrik-bakke 🇳🇴 690 103 10ms 2 Oct 2022 First Prev 801–880 of 1,911 Next Last