The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Emirp 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 rambox11 740 76 11ms 27 Apr 2018 721st Davr1 🇨🇿 740 76 10ms 15 Oct 2023 721st ovs-code 🇩🇪 740 76 10ms 17 Nov 2024 724th GrayJoKing 🇦🇺 739 54 36ms 24 Nov 2021 724th emgordon154 739 54 36ms 26 Jul 2024 726th ian-h-chamberlain 🇺🇸 739 107 39ms 20 Oct 2025 727th RustemB 🇷🇺 738 50 90ms 3 Jan 2021 727th ovs-code 🇩🇪 738 50 155ms 8 May 2024 729th ovs-code 🇩🇪 737 68 442ms 16 Jan 2024 730th gnuvince 735 34 2ms 28 Jun 2025 731st AlephSquirrel 734 40 45ms 31 Jul 2022 732nd GrayJoKing 🇦🇺 732 78 3ms 26 Jul 2023 733rd itsh01 731 77 11ms 23 Aug 2021 734th davitf 730 74 11ms 19 Nov 2018 734th ydevor 🇮🇱 730 74 10ms 26 Nov 2020 734th itsjustfreekie 730 74 12ms 19 Sep 2021 734th ZakkkkAttackkkk 🇵🇭 730 74 12ms 26 Dec 2021 734th domingues 🇵🇹 730 74 9ms 10 Aug 2022 734th jakobkordez 🇸🇮 730 74 56ms 31 Oct 2022 734th scpchicken 🇵🇼 730 74 10ms 17 Jan 2023 734th aksyristos 730 74 11ms 26 Jan 2023 742nd dokutan 730 93 369ms 24 Sep 2025 743rd msbranicky 729 214 10ms 29 Aug 2023 744th Yewzir 🇧🇪 728 77 378ms 8 May 2023 744th janbehrens 🇩🇪 728 77 376ms 20 Jun 2023 746th GrayJoKing 🇦🇺 727 73 4ms 16 Aug 2023 746th edsrzf 🇳🇿 727 73 4ms 30 Nov 2025 748th annaproxy 726 91 130ms 5 Feb 2022 749th sisyphus-ppcg 🇦🇺 725 55 38ms 15 Jun 2021 749th Yewzir 🇧🇪 725 55 37ms 7 Feb 2024 751st inventshah 725 62 2,718ms 24 Oct 2024 751st DialFrost 🇸🇬 725 62 3,318ms 25 Dec 2024 753rd jared-hughes 725 89 2ms 5 Jul 2024 754th MeWhenI 🇻🇦 725 109 2ms 10 Oct 2023 755th emgordon154 723 59 1,376ms 26 Jul 2024 756th marcin7Cd 723 97 5ms 6 Feb 2021 757th DialFrost 🇸🇬 722 94 474ms 1 Jan 2026 758th FlorianCassayre 🇫🇷 721 75 13ms 18 Sep 2023 759th marcin7Cd 721 78 9ms 5 Oct 2020 759th PatrickStephansen 🇿🇦 721 78 10ms 16 Oct 2020 759th Shanethegamer 🇺🇸 721 78 12ms 19 Apr 2022 762nd dokutan 721 90 100ms 12 Dec 2025 763rd jmerle 🇳🇱 721 134 7ms 4 Jul 2023 764th DialFrost 🇸🇬 720 79 5ms 16 Dec 2025 765th rucin93 🇵🇱 718 110 12ms 18 Nov 2025 766th SirBogman 🇺🇸 716 41 45ms 29 Oct 2022 766th CaedenHarper 🇨🇦 716 41 48ms 10 days ago 768th commandz0 🇺🇸 716 70 432ms 15 Jan 2024 769th Steffan153 🇫🇮 716 135 7ms 12 Mar 2023 769th annaproxy 716 135 8ms 12 Mar 2023 769th Shanethegamer 🇺🇸 716 135 7ms 12 Mar 2023 769th lynn 716 135 7ms 13 Mar 2023 769th JayXon 🇺🇸 716 135 7ms 13 Mar 2023 769th ovs-code 🇩🇪 716 135 7ms 13 Mar 2023 769th Lydxn 🇨🇦 716 135 7ms 13 Mar 2023 769th dokutan 716 135 7ms 1 Apr 2023 769th MeWhenI 🇻🇦 716 135 7ms 23 Nov 2023 769th Yewzir 🇧🇪 716 135 7ms 6 Mar 2024 769th KatieLG 🇬🇧 716 135 7ms 31 Jul 2024 769th snoozingnewt 🇨🇦 716 135 7ms 5 Oct 2025 769th JOrE20 716 135 7ms 15 Dec 2025 782nd nickspoons 🇳🇿 714 40 33ms 1 Aug 2022 783rd SirBogman 🇺🇸 713 49 230ms 8 Jan 2024 784th marshallward 🇺🇸 713 114 52ms 2 Oct 2020 785th edsrzf 🇳🇿 712 58 1,224ms 8 Sep 2025 786th lynn 712 68 1,233ms 27 May 2021 787th prplz 🇦🇺 712 78 124ms 10 Jul 2021 787th MeWhenI 🇻🇦 712 78 131ms 4 Jan 2022 787th GrayJoKing 🇦🇺 712 78 125ms 9 Apr 2022 790th BBoehm 🇩🇪 712 79 10ms 20 Jan 2021 790th DialFrost 🇸🇬 712 79 10ms 14 Nov 2023 792nd lynn 712 100 125ms 7 Jul 2024 792nd sean-niemann 🇺🇸 712 100 130ms 6 Jun 2025 794th Bubbler-4 711 55 63ms 13 Sep 2023 794th DialFrost 🇸🇬 711 55 64ms 8 Apr 2025 796th Irratix 🇳🇱 711 60 1,311ms 25 Mar 2021 797th GrayJoKing 🇦🇺 711 74 139ms 10 Aug 2024 798th Nic0M 711 76 10ms 13 Aug 2023 798th vgamula 🇺🇦 711 76 13ms 10 Jul 2024 798th Emutis 🇱🇹 711 76 10ms 10 Nov 2025 First Prev 721–800 of 3,188 Next Last
