The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 28 hours. 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 799th MichaelMBradley 🇨🇦 725 98 10ms 19 Jun 2022 802nd perlebach 🇨🇿 725 143 2,673ms 10 Jun 2025 803rd Aurel300 🇨🇭 725 165 220ms 20 Jun 2024 804th gjoacorp 🇬🇧 724 172 2,989ms 4 Aug 2025 805th primo-ppcg 🇹🇭 723 62 647ms 25 Aug 2020 806th Alessandro-Balconi 🇮🇹 722 79 90ms 15 Jul 2023 807th tomh1012 722 157 466ms 5 Sep 2025 808th helbling 🇨🇭 721 93 11ms 29 May 2024 809th albanian-laundromat 720 137 112ms 7 Nov 2025 810th KatieLG 🇬🇧 719 135 2ms 24 Sep 2021 810th emgordon154 719 135 2ms 21 Jun 2024 812th vezzick 717 99 14ms 7 Mar 2021 812th TimHuisman1703 717 99 10ms 7 Jan 2022 812th hellwue 717 99 9ms 25 Feb 2022 812th davecame 717 99 10ms 2 Aug 2023 816th Shanethegamer 🇺🇸 717 158 424ms 9 Apr 2025 817th primo-ppcg 🇹🇭 717 171 427ms 29 Aug 2020 818th DialFrost 🇸🇬 716 85 9ms 7 Nov 2025 819th okaponta 716 167 243ms 11 Jan 2024 820th TaserTheFox 🇺🇸 715 79 283ms 1 Jun 2023 821st janbehrens 🇩🇪 714 85 12ms 29 Oct 2021 822nd FlyingPenguin223 713 66 43ms 11 Nov 2024 823rd neihousaigaai 713 94 10ms 18 Apr 2021 823rd emgordon154 713 94 12ms 24 Dec 2021 823rd junkondo-jp 713 94 11ms 8 Jun 2024 823rd Yax42 🇫🇷 713 94 12ms 5 Sep 2025 823rd JOrE20 713 94 10ms 27 Jan 2026 828th ertz1ertz 713 159 393ms 14 Aug 2024 829th CatsAreFluffy 711 102 50ms 24 Feb 2023 830th stefangimmillaro 710 99 2,926ms 18 Oct 2023 831st EwanSkene 710 100 12ms 3 Sep 2020 831st boxjelly 710 100 11ms 14 Feb 2021 831st PhysicDev 🇫🇷 710 100 10ms 16 Mar 2022 831st wen1now 710 100 10ms 6 Nov 2023 831st Alban-Boissard 710 100 10ms 14 Jun 2025 831st TheZwierzLF 🇵🇱 710 100 10ms 17 Dec 2025 837th stefangimmillaro 710 139 2,286ms 18 Oct 2023 838th billings7 🇬🇧 709 160 470ms 22 May 2024 839th DialFrost 🇸🇬 708 137 2ms 9 Mar 2025 840th Betuaredead 708 176 2,959ms 13 Jan 2023 841st MeWhenI 🇻🇦 708 210 304ms 9 Feb 2023 842nd CatsAreFluffy 707 93 455ms 15 Jan 2024 843rd tayloia 🇬🇧 706 95 15ms 26 May 2022 843rd dmrichwa 🇺🇸 706 95 13ms 4 Oct 2022 843rd voytxt 🇨🇿 706 95 10ms 17 Jul 2024 846th NewDefectus 🇮🇱 706 134 144ms 18 Feb 2021 847th michelebastione 🇮🇹 704 161 435ms 20 Jul 2024 848th jameslindesay 703 101 42ms 25 Feb 2021 848th galloj 🇨🇿 703 101 11ms 21 Aug 2022 848th Acky-Acky 703 101 11ms 9 May 2024 851st btjones0 703 170 232ms 31 Dec 2020 852nd Lv0Sys 🇵🇱 702 67 38ms 3 Dec 2025 853rd MeWhenI 🇻🇦 702 139 544ms 4 Mar 2022 854th Yewzir 🇧🇪 701 64 590ms 28 Feb 2024 855th snoozingnewt 🇨🇦 701 119 8ms 13 Oct 2025 856th snoozingnewt 🇨🇦 700 114 3ms 13 Oct 2025 857th GolfingSuccess 🇬🇷 700 151 2ms 26 Oct 2023 858th albanian-laundromat 699 87 3ms 6 Dec 2025 859th HCRitter 🇩🇪 698 81 311ms 31 Oct 2023 860th cywong-amino 🇭🇰 698 96 10ms 7 Oct 2020 860th jared-hughes 698 96 10ms 29 Oct 2021 860th KrausRaus 🇺🇸 698 96 11ms 21 Dec 2021 860th Shanethegamer 🇺🇸 698 96 19ms 10 Mar 2022 860th zakariamouhid 698 96 10ms 21 Jun 2023 860th Maznek 698 96 83ms 10 Jul 2023 860th two-bad 🇬🇧 698 96 12ms 6 Feb 2024 867th vgamula 🇺🇦 698 167 30ms 25 Jan 2024 868th lifthrasiir 🇰🇷 697 50 2ms 28 Nov 2024 869th AlephSquirrel 697 107 4ms 20 Apr 2023 870th Shanethegamer 🇺🇸 696 101 4ms 6 Apr 2023 871st findegil 696 102 10ms 26 Aug 2020 871st austinrwarner 696 102 11ms 25 Dec 2020 871st Omega65536 🇩🇪 696 102 16ms 6 Jan 2021 871st jhpaques 🇫🇷 696 102 14ms 29 Jul 2022 871st jamesthekee 696 102 10ms 25 Jan 2025 876th m-tkach 🇺🇦 693 109 1ms 4 Feb 2024 877th TheZwierzLF 🇵🇱 692 95 447ms 17 Dec 2025 878th PatrickStephansen 🇿🇦 691 97 10ms 10 Sep 2020 878th alasdair-greenland 691 97 10ms 19 Nov 2021 878th nakatchi 691 97 10ms 27 Feb 2024 First Prev 801–880 of 1,916 Next Last