The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 26 hours. Why not try and solve them ahead of time?
Leyland 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 721st HumanEquivalentUnit 711 38 32ms 12 Oct 2020 721st jared-hughes 711 38 45ms 2 Aug 2022 721st Natanaelel 🇸🇪 711 38 41ms 25 Feb 2023 724th abailey2020 🇺🇸 711 85 10ms 10 Dec 2020 724th Secozzi 711 85 14ms 21 Mar 2021 724th tkr-sh 🇰🇵 711 85 81ms 29 Apr 2022 724th jtaxen 711 85 11ms 29 Apr 2024 724th cros107 🇦🇺 711 85 16ms 11 Jul 2024 724th hiichbindermax 711 85 12ms 17 Sep 2024 724th wuduculfre 711 85 10ms 22 Jul 2025 731st stefangimmillaro 709 99 2,926ms 18 Oct 2023 732nd emgordon154 709 109 8ms 10 Dec 2024 733rd stefangimmillaro 709 139 2,286ms 18 Oct 2023 734th billings7 🇬🇧 708 160 470ms 22 May 2024 735th MeWhenI 🇻🇦 708 210 304ms 9 Feb 2023 736th Andriamanitra 🇫🇮 707 60 38ms 26 Jul 2023 736th olleicua 🇺🇸 707 60 35ms 23 Apr 2025 738th DialFrost 🇸🇬 707 137 2ms 9 Mar 2025 739th Betuaredead 707 176 2,959ms 13 Jan 2023 740th tayloia 🇬🇧 705 95 9ms 26 May 2022 740th voytxt 🇨🇿 705 95 9ms 17 Jul 2024 742nd clockworknazo 704 109 25ms 10 Mar 2023 743rd sk- 703 86 12ms 11 Sep 2020 743rd Loag 703 86 12ms 14 Nov 2021 743rd msbranicky 703 86 10ms 23 Jul 2023 743rd aalec 703 86 18ms 25 Apr 2024 743rd Andrey2001 703 86 10ms 1 Feb 2026 748th michelebastione 🇮🇹 703 161 435ms 20 Jul 2024 749th btjones0 703 170 232ms 31 Dec 2020 750th MeWhenI 🇻🇦 701 139 544ms 4 Mar 2022 751st snoozingnewt 🇨🇦 699 114 3ms 13 Oct 2025 752nd GolfingSuccess 🇬🇷 699 151 2ms 26 Oct 2023 753rd o0lit3 🇺🇸 698 60 4ms 8 Oct 2020 754th albanian-laundromat 698 87 3ms 6 Dec 2025 755th jared-hughes 698 96 10ms 29 Oct 2021 755th zakariamouhid 698 96 9ms 21 Jun 2023 755th Maznek 698 96 74ms 10 Jul 2023 755th two-bad 🇬🇧 698 96 10ms 6 Feb 2024 759th vgamula 🇺🇦 697 167 30ms 25 Jan 2024 760th HCRitter 🇩🇪 696 81 311ms 31 Oct 2023 761st akshatj27 🇦🇶 695 61 36ms 11 Jan 2022 761st orthoplex 🇨🇽 695 61 38ms 1 Apr 2022 761st OhmNomNom 695 61 41ms 14 Oct 2022 764th jiaminglimjm 🇲🇾 695 87 10ms 12 Sep 2020 764th Pena86 695 87 11ms 19 Feb 2021 764th osmith93 695 87 11ms 31 Jul 2021 764th roytu 695 87 12ms 30 May 2022 764th fkantelberg 695 87 10ms 18 Jul 2023 764th iczelia 🇩🇪 695 87 10ms 19 Oct 2025 764th Emutis 🇱🇹 695 87 10ms 2 Nov 2025 764th madeforlosers 695 87 616ms 13 Nov 2025 764th Sandw1ch123 695 87 10ms 13 hours ago 773rd Shanethegamer 🇺🇸 695 101 4ms 6 Apr 2023 774th AlephSquirrel 695 107 4ms 20 Apr 2023 775th lifthrasiir 🇰🇷 694 50 2ms 28 Nov 2024 776th primo-ppcg 🇹🇭 693 62 647ms 25 Aug 2020 776th Yewzir 🇧🇪 693 62 590ms 28 Feb 2024 778th m-tkach 🇺🇦 692 109 1ms 4 Feb 2024 779th PatrickStephansen 🇿🇦 690 97 9ms 10 Sep 2020 779th alasdair-greenland 690 97 10ms 19 Nov 2021 779th nakatchi 690 97 9ms 27 Feb 2024 782nd DialFrost 🇸🇬 690 139 189ms 10 Nov 2025 783rd FortuiteMan 🇫🇷 690 272 2,011ms 26 Jan 2026 784th Andriamanitra 🇫🇮 689 108 4ms 13 Jun 2024 785th CaedenHarper 🇨🇦 688 216 309ms 12 Nov 2025 786th hjcafaroUC 687 88 10ms 26 Jul 2020 786th argusdusty 🇺🇸 687 88 10ms 27 Dec 2020 786th richard-oelze 🇩🇪 687 88 16ms 6 Feb 2021 786th fynnkroeger 687 88 18ms 8 Feb 2021 786th pengu1n-master 687 88 14ms 11 Oct 2021 786th mathisfun271 687 88 10ms 1 Nov 2021 786th petroselo 687 88 11ms 13 Apr 2022 786th dalamajama 687 88 4,433ms 17 Aug 2023 786th chartung17 687 88 10ms 14 Jan 2024 786th WillConker 687 88 10ms 10 Mar 2024 786th zgialor-lab 687 88 10ms 5 days ago 797th Shanethegamer 🇺🇸 687 116 2ms 2 Mar 2023 798th emgordon154 686 84 153ms 9 Aug 2024 799th JunkIce 685 84 452ms 3 Dec 2024 800th emgordon154 684 62 37ms 13 Nov 2021 First Prev 721–800 of 1,899 Next Last