The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 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 715th Papushkado 764 93 12ms 18 Nov 2025 715th klixel 🇨🇦 764 93 10ms 9 Jan 2026 723rd NewDefectus 🇮🇱 764 95 48ms 8 Jul 2021 724th StarmaQ 763 99 2ms 22 Jan 2021 724th edsrzf 🇳🇿 763 99 2ms 30 May 2025 726th ovs-code 🇩🇪 763 124 142ms 28 Nov 2022 727th lynn 763 126 188ms 19 May 2021 728th msbranicky 763 195 291ms 31 Aug 2023 729th targrik 762 88 625ms 13 May 2025 730th DialFrost 🇸🇬 762 157 152ms 7 Nov 2025 731st snoozingnewt 🇨🇦 761 75 97ms 10 Feb 2026 732nd DialFrost 🇸🇬 761 260 1,407ms 3 Mar 2025 733rd Andriamanitra 🇫🇮 760 59 471ms 26 Jul 2023 734th emgordon154 759 62 37ms 13 Nov 2021 734th KatieLG 🇬🇧 759 62 34ms 10 Apr 2022 734th jared-hughes 759 62 34ms 20 Sep 2022 737th kkoenig 759 196 308ms 7 Sep 2025 738th janbehrens 🇩🇪 756 93 5ms 29 Oct 2021 739th bbakersmith 756 94 9ms 18 Jul 2021 739th jfallon1997 756 94 11ms 9 Aug 2022 739th wobblybits 756 94 10ms 19 Aug 2025 742nd jared-hughes 755 165 2,969ms 24 Jun 2022 742nd snyderek 🇺🇸 755 165 2,935ms 18 Dec 2024 744th prplz 🇦🇺 753 89 552ms 9 Oct 2021 745th anter69 🇭🇺 752 82 1,300ms 17 Sep 2024 745th Shanethegamer 🇺🇸 752 82 66ms 8 Dec 2024 745th edsrzf 🇳🇿 752 82 65ms 31 Jul 2025 748th edsrzf 🇳🇿 752 163 400ms 26 Sep 2025 748th CaedenHarper 🇨🇦 752 163 478ms 9 Oct 2025 750th LeeCamp 748 95 10ms 27 Dec 2021 750th 4ndyJ 🇬🇧 748 95 9ms 7 Feb 2023 750th 0-ag 748 95 11ms 25 Aug 2025 750th nemoyatpeace 748 95 10ms 14 Jan 2026 750th TheSecondComing123 748 95 11ms 5 Feb 2026 755th Shanethegamer 🇺🇸 747 60 616ms 17 Feb 2023 756th GrayJoKing 🇦🇺 747 156 40ms 4 Jan 2023 757th tomtheisen 🇺🇸 745 90 9ms 6 Oct 2020 758th jtaxen 743 92 117ms 19 Jun 2024 759th retrohun 742 82 2ms 9 Nov 2022 760th emgordon154 742 86 143ms 15 Nov 2024 761st Psirving 740 96 10ms 29 Jul 2020 761st henrytranter 740 96 10ms 27 Aug 2020 761st chrishm909 740 96 11ms 23 May 2021 761st sleepyStick 740 96 16ms 3 Dec 2021 761st tterem 740 96 11ms 8 Jun 2022 761st P-Quentin 🇫🇷 740 96 12ms 3 Aug 2022 761st sbyrne51 740 96 10ms 1 Oct 2022 761st NerdyMcNerd42 740 96 10ms 27 Oct 2022 769th CheeseCake628 🇳🇴 739 89 482ms 17 Jan 2024 769th namelessiw 739 89 489ms 5 Mar 2024 771st DialFrost 🇸🇬 739 153 203ms 6 Nov 2025 772nd Shanethegamer 🇺🇸 738 158 30ms 20 Sep 2023 773rd jared-hughes 737 38 45ms 2 Aug 2022 773rd Natanaelel 🇸🇪 737 38 41ms 25 Feb 2023 775th janbehrens 🇩🇪 737 76 3ms 29 Oct 2021 776th thisishowmymindworks 🇳🇴 737 91 20ms 5 Oct 2020 777th Herbert00709 🇵🇱 737 169 66ms 5 days ago 778th JRaspass 🇬🇧 736 64 145ms 26 Jul 2020 779th Waffle3z 735 64 47ms 22 Jan 2021 779th olivermrose 🇺🇸 735 64 40ms 3 Oct 2021 781st Irratix 🇳🇱 735 93 118ms 1 Nov 2021 782nd GrayJoKing 🇦🇺 735 150 4ms 19 Nov 2025 783rd MeWhenI 🇻🇦 734 77 248ms 29 Jan 2023 784th GrayJoKing 🇦🇺 734 133 465ms 6 Jun 2022 785th snoozingnewt 🇨🇦 733 77 5ms 13 Oct 2025 786th KrausRaus 🇺🇸 733 96 11ms 21 Dec 2021 787th asadullayev 732 97 15ms 3 Mar 2021 787th befoster 732 97 10ms 10 Apr 2021 787th myleopard 732 97 14ms 15 Oct 2021 787th Andrey135296 732 97 10ms 4 Apr 2022 787th Bodo171 732 97 16ms 25 Nov 2022 792nd vgamula 🇺🇦 732 114 9ms 26 Jan 2024 793rd annaproxy 731 155 404ms 1 Apr 2022 793rd snoozingnewt 🇨🇦 731 155 416ms 13 Oct 2025 795th roupiq 🇵🇱 728 171 2,798ms 5 days ago 796th emgordon154 726 85 1,220ms 11 Jan 2026 797th jared-hughes 726 104 14ms 27 Nov 2021 798th inventshah 726 110 2ms 12 Sep 2022 799th ehulinsky 🇺🇸 725 98 10ms 11 Nov 2021 799th Trunksistor 🇫🇷 725 98 10ms 24 May 2022 First Prev 721–800 of 1,916 Next Last