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 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 719th Natanaelel 🇸🇪 711 38 41ms 25 Feb 2023 722nd abailey2020 🇺🇸 711 85 10ms 10 Dec 2020 722nd Secozzi 711 85 14ms 21 Mar 2021 722nd tkr-sh 🇰🇵 711 85 81ms 29 Apr 2022 722nd jtaxen 711 85 11ms 29 Apr 2024 722nd cros107 🇦🇺 711 85 16ms 11 Jul 2024 722nd hiichbindermax 711 85 12ms 17 Sep 2024 722nd wuduculfre 711 85 10ms 22 Jul 2025 729th stefangimmillaro 709 99 2,926ms 18 Oct 2023 730th emgordon154 709 109 8ms 10 Dec 2024 731st stefangimmillaro 709 139 2,286ms 18 Oct 2023 732nd billings7 🇬🇧 708 160 470ms 22 May 2024 733rd MeWhenI 🇻🇦 708 210 304ms 9 Feb 2023 734th Andriamanitra 🇫🇮 707 60 38ms 26 Jul 2023 734th olleicua 🇺🇸 707 60 35ms 23 Apr 2025 736th DialFrost 🇸🇬 707 137 2ms 9 Mar 2025 737th Betuaredead 707 176 2,959ms 13 Jan 2023 738th tayloia 🇬🇧 705 95 15ms 26 May 2022 738th voytxt 🇨🇿 705 95 10ms 17 Jul 2024 740th clockworknazo 704 109 25ms 10 Mar 2023 741st sk- 703 86 12ms 11 Sep 2020 741st Loag 703 86 12ms 14 Nov 2021 741st msbranicky 703 86 10ms 23 Jul 2023 741st aalec 703 86 18ms 25 Apr 2024 741st Andrey2001 703 86 10ms 1 Feb 2026 746th michelebastione 🇮🇹 703 161 435ms 20 Jul 2024 747th btjones0 703 170 240ms 31 Dec 2020 748th MeWhenI 🇻🇦 701 139 544ms 4 Mar 2022 749th snoozingnewt 🇨🇦 699 114 3ms 13 Oct 2025 750th GolfingSuccess 🇬🇷 699 151 2ms 26 Oct 2023 751st o0lit3 🇺🇸 698 60 3ms 8 Oct 2020 752nd albanian-laundromat 698 87 3ms 6 Dec 2025 753rd jared-hughes 698 96 10ms 29 Oct 2021 753rd zakariamouhid 698 96 10ms 21 Jun 2023 753rd Maznek 698 96 83ms 10 Jul 2023 753rd two-bad 🇬🇧 698 96 12ms 6 Feb 2024 757th vgamula 🇺🇦 697 167 30ms 25 Jan 2024 758th HCRitter 🇩🇪 696 81 311ms 31 Oct 2023 759th akshatj27 🇦🇶 695 61 36ms 11 Jan 2022 759th orthoplex 🇨🇽 695 61 38ms 1 Apr 2022 759th OhmNomNom 695 61 41ms 14 Oct 2022 762nd jiaminglimjm 🇲🇾 695 87 10ms 12 Sep 2020 762nd Pena86 695 87 11ms 19 Feb 2021 762nd osmith93 695 87 11ms 31 Jul 2021 762nd roytu 695 87 12ms 30 May 2022 762nd fkantelberg 695 87 10ms 18 Jul 2023 762nd iczelia 🇩🇪 695 87 10ms 19 Oct 2025 762nd Emutis 🇱🇹 695 87 10ms 2 Nov 2025 762nd madeforlosers 695 87 616ms 13 Nov 2025 770th Shanethegamer 🇺🇸 695 101 4ms 6 Apr 2023 771st AlephSquirrel 695 107 4ms 20 Apr 2023 772nd lifthrasiir 🇰🇷 694 50 2ms 28 Nov 2024 773rd primo-ppcg 🇹🇭 693 62 647ms 25 Aug 2020 773rd Yewzir 🇧🇪 693 62 590ms 28 Feb 2024 775th m-tkach 🇺🇦 692 109 1ms 4 Feb 2024 776th PatrickStephansen 🇿🇦 690 97 10ms 10 Sep 2020 776th alasdair-greenland 690 97 10ms 19 Nov 2021 776th nakatchi 690 97 10ms 27 Feb 2024 779th DialFrost 🇸🇬 690 139 189ms 10 Nov 2025 780th FortuiteMan 🇫🇷 690 272 2,011ms 26 Jan 2026 781st Andriamanitra 🇫🇮 689 108 4ms 13 Jun 2024 782nd CaedenHarper 🇨🇦 688 216 309ms 12 Nov 2025 783rd hjcafaroUC 687 88 10ms 26 Jul 2020 783rd argusdusty 🇺🇸 687 88 10ms 27 Dec 2020 783rd richard-oelze 🇩🇪 687 88 16ms 6 Feb 2021 783rd fynnkroeger 687 88 18ms 8 Feb 2021 783rd pengu1n-master 687 88 14ms 11 Oct 2021 783rd mathisfun271 687 88 10ms 1 Nov 2021 783rd petroselo 687 88 11ms 13 Apr 2022 783rd dalamajama 687 88 4,433ms 17 Aug 2023 783rd chartung17 687 88 10ms 14 Jan 2024 783rd WillConker 687 88 10ms 10 Mar 2024 783rd zgialor-lab 687 88 10ms 4 hours ago 794th Shanethegamer 🇺🇸 687 116 2ms 2 Mar 2023 795th emgordon154 686 84 153ms 9 Aug 2024 796th JunkIce 685 84 452ms 3 Dec 2024 797th emgordon154 684 62 37ms 13 Nov 2021 797th jared-hughes 684 62 34ms 20 Sep 2022 799th MeWhenI 🇻🇦 684 90 1,320ms 12 May 2023 800th tigerdan2 🇩🇪 684 179 483ms 30 Nov 2025 First Prev 721–800 of 1,896 Next Last