The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Ordinal 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 881st rak1507 🇬🇧 729 155 178ms 21 Jan 2021 881st annaproxy 729 155 184ms 4 Sep 2022 881st yzhs 🇩🇪 729 155 178ms 26 Jun 2023 884th DialFrost 🇸🇬 728 80 144ms 29 Oct 2024 885th MeWhenI 🇻🇦 728 103 154ms 2 days ago 886th annaproxy 728 112 381ms 20 Mar 2022 887th oddvalue 726 82 6ms 4 Aug 2023 888th Shanethegamer 🇺🇸 725 69 1,283ms 2 Nov 2024 889th iczelia 🇩🇪 725 100 2ms 16 Oct 2025 890th Shanethegamer 🇺🇸 725 123 1,277ms 30 Oct 2024 891st primo-ppcg 🇹🇭 724 150 195ms 9 Jan 2020 891st WhoisDavid 724 150 169ms 15 Sep 2020 893rd lowlighter 723 88 13ms 30 Oct 2020 893rd Athe81 723 88 10ms 4 Nov 2020 893rd Re-Adventures 🇮🇳 723 88 12ms 21 Apr 2023 893rd Protothor 723 88 11ms 12 Jun 2025 893rd madeforlosers 723 88 11ms 5 Nov 2025 898th adyache 🇺🇸 723 91 17ms 18 Aug 2023 899th kg583 🇺🇸 723 124 42ms 14 Feb 2025 900th tailorspy 723 128 472ms 12 Aug 2024 901st DialFrost 🇸🇬 722 154 42ms 8 May 2025 902nd ovs-code 🇩🇪 721 50 34ms 10 Jan 2024 903rd varhammer 721 102 16ms 13 Dec 2023 904th ovs-code 🇩🇪 721 107 67ms 18 Sep 2023 905th billings7 🇬🇧 721 113 399ms 21 Nov 2021 906th primo-ppcg 🇹🇭 721 145 25ms 25 Jun 2022 907th LogicalJoe 720 88 12ms 25 Oct 2022 907th bricknellj 720 88 13ms 29 Dec 2022 907th nayakrujul 720 88 13ms 1 Feb 2023 907th 2011-Chan-Ethan 720 88 13ms 20 Jul 2023 907th ldoney 720 88 12ms 21 Aug 2023 907th FlorianCassayre 🇫🇷 720 88 13ms 18 Sep 2023 907th 5cw 🇺🇸 720 88 13ms 15 Jun 2024 914th timvermeulen 720 151 166ms 7 Jan 2020 914th argusdusty 🇺🇸 720 151 181ms 21 Aug 2022 916th MeWhenI 🇻🇦 718 252 1,427ms 10 Feb 2025 917th Andriamanitra 🇫🇮 717 102 3ms 2 Feb 2024 918th MeWhenI 🇻🇦 717 129 446ms 14 Nov 2022 919th MarcMush 🇫🇷 716 88 491ms 20 Oct 2021 920th anter69 🇭🇺 715 70 1,202ms 15 Feb 2023 921st HumanoidCPU 715 89 11ms 22 Apr 2024 922nd YuryChaikou-ServiceNow 715 114 398ms 29 Oct 2022 923rd verticallity 715 152 179ms 7 Apr 2022 924th dokutan 714 98 11ms 12 Feb 2025 925th alexhuntley 714 103 16ms 11 Apr 2021 926th Schmitt-Very-Cool 713 140 517ms 3 Oct 2025 927th 197g 712 89 11ms 7 Jan 2020 927th zxtej 712 89 14ms 31 Oct 2023 927th Languag3 712 89 14ms 10 Dec 2025 930th biinari 711 62 37ms 13 Aug 2020 930th Shanethegamer 🇺🇸 711 62 40ms 12 Dec 2021 932nd Irratix 🇳🇱 711 102 3ms 13 Jun 2022 932nd Babafaba 711 102 2ms 10 Oct 2025 934th DialFrost 🇸🇬 711 126 45ms 16 Feb 2025 934th GolfingSuccess 🇬🇷 711 126 43ms 6 Mar 2025 936th emgordon154 710 106 2,674ms 28 Oct 2024 937th razetime 708 45 3ms 12 Jan 2022 937th 5cw 🇺🇸 708 45 3ms 6 Apr 2023 939th GrayJoKing 🇦🇺 708 84 6ms 2 Jul 2023 940th alexkunin 707 90 11ms 14 Jul 2019 940th omurakazuaki 🇯🇵 707 90 11ms 21 Sep 2019 942nd Irratix 🇳🇱 707 131 1,409ms 3 Aug 2023 943rd msbranicky 707 147 3ms 10 Aug 2023 944th emplv 🇱🇻 707 148 25ms 30 Jun 2022 945th stefangimmillaro 705 75 255ms 9 Aug 2023 946th n1LS 704 90 12ms 8 Oct 2019 946th Lemonfrostt 704 90 12ms 14 Dec 2019 946th Bubbler-4 704 90 13ms 8 Feb 2022 949th passsy 🇩🇪 703 107 139ms 5 May 2025 950th Alikont 703 116 399ms 21 Nov 2021 950th JDiLenarda 🇫🇷 703 116 373ms 21 Nov 2021 950th Yewzir 🇧🇪 703 116 387ms 19 Jun 2024 953rd Bubbler-4 702 110 63ms 13 Sep 2023 954th carlmrichter 🇩🇪 700 91 11ms 29 Apr 2021 954th sultan 700 91 12ms 25 Feb 2024 954th KatieLG 🇬🇧 700 91 12ms 5 Oct 2025 957th Shanethegamer 🇺🇸 700 128 41ms 13 Feb 2025 958th m-tkach 🇺🇦 698 104 2ms 23 Aug 2022 959th MeWhenI 🇻🇦 698 127 412ms 27 Jul 2024 960th DialFrost 🇸🇬 698 162 181ms 8 Aug 2024 First Prev 881–960 of 1,895 Next Last