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?
Ordinal 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 719th voytxt 🇨🇿 812 78 148ms 17 Apr 2025 722nd Lv0Sys 🇵🇱 812 99 2ms 3 Dec 2025 723rd roavin 812 101 419ms 23 Jun 2022 724th GrayJoKing 🇦🇺 812 140 178ms 8 Dec 2020 724th Hillsoft 812 140 166ms 27 Jul 2022 726th albanian-laundromat 812 224 1,429ms 15 Oct 2025 727th janbehrens 🇩🇪 811 66 265ms 5 Dec 2023 728th Yewzir 🇧🇪 811 83 4ms 8 Jun 2024 728th rucin93 🇵🇱 811 83 4ms 23 Apr 2025 730th RockOfStone 811 91 3ms 4 Nov 2021 731st Steffan153 🇫🇮 811 126 79ms 2 days ago 732nd MeWhenI 🇻🇦 810 47 4ms 16 Apr 2023 733rd JulianJJ 810 79 12ms 7 Dec 2020 733rd xkacer 🇨🇿 810 79 13ms 31 Jan 2021 733rd Ephellon 810 79 12ms 4 Dec 2022 733rd Mazn3k 810 79 15ms 2 Mar 2023 733rd stefangabos 🇷🇴 810 79 12ms 14 May 2023 733rd Jak-Ch-ll 810 79 12ms 5 Jul 2025 739th Shanethegamer 🇺🇸 810 94 2,833ms 28 Oct 2024 739th sean-niemann 🇺🇸 810 94 2,744ms 7 Jan 2026 741st ovs-code 🇩🇪 810 135 157ms 21 Jun 2023 742nd b97tsk 810 153 310ms 26 Apr 2020 742nd argusdusty 🇺🇸 810 153 291ms 21 Aug 2022 744th janbehrens 🇩🇪 809 123 468ms 5 Dec 2023 745th stefangimmillaro 807 139 42ms 26 Apr 2025 746th sean-niemann 🇺🇸 806 130 3ms 18 Jan 2025 747th edsrzf 🇳🇿 805 70 6ms 8 Nov 2025 748th toombs-caeman 804 97 22ms 8 Mar 2020 748th Fargeol 804 97 12ms 17 Nov 2021 748th vishwathg 804 97 13ms 7 Apr 2023 748th bnic24 804 97 12ms 22 Aug 2024 748th albanian-laundromat 804 97 13ms 29 Aug 2025 748th Googolplexo 🇷🇺 804 97 13ms 7 hours ago 754th iczelia 🇩🇪 804 100 2ms 16 Oct 2025 755th amazingalek 🇳🇴 804 102 455ms 1 Jan 2026 756th primo-ppcg 🇹🇭 803 75 9ms 4 Jul 2023 756th xsot 🇸🇬 803 75 10ms 13 Apr 2024 756th targrik 803 75 10ms 9 Sep 2025 759th GrayJoKing 🇦🇺 802 79 156ms 4 Aug 2024 759th pardouin 🇫🇷 802 79 166ms 17 Apr 2025 761st SirBogman 🇺🇸 801 58 33ms 5 Jan 2020 762nd AlephSquirrel 801 82 442ms 21 Jan 2024 763rd LukeBridges 🇬🇧 800 80 16ms 4 Nov 2022 763rd AlephSquirrel 800 80 11ms 6 Jan 2023 763rd junkondo-jp 800 80 11ms 2 Jun 2024 763rd alexsave 800 80 11ms 7 Nov 2024 767th tuffnatty 🇩🇪 800 104 11ms 20 Jul 2023 768th MeWhenI 🇻🇦 800 131 3ms 10 Sep 2022 768th GrayJoKing 🇦🇺 800 131 3ms 11 Sep 2022 770th laikoni 800 142 177ms 21 Sep 2019 770th tobeannouncd 800 142 177ms 9 Jan 2024 772nd yzzyx 800 155 271ms 18 Apr 2020 773rd TimCurwick 🇺🇸 799 67 311ms 29 Sep 2020 773rd hasan1st 799 67 297ms 28 May 2022 773rd juliansiebert 🇩🇪 799 67 268ms 10 Nov 2024 773rd madex 🇩🇪 799 67 330ms 9 days ago 777th Bubbler-4 798 41 3ms 19 Jan 2022 777th rak1507 🇬🇧 798 41 3ms 2 Jan 2023 779th pzagrebin 798 66 49ms 26 Jul 2022 780th lynn 798 137 158ms 31 Mar 2022 780th Shanethegamer 🇺🇸 798 137 30ms 10 Feb 2026 782nd iznax 797 103 388ms 21 Nov 2021 783rd raphaelimahorn 797 126 383ms 13 days ago 784th dzhang314 796 98 12ms 16 Sep 2019 784th 77Tigers 796 98 12ms 11 Mar 2021 784th bbakersmith 796 98 13ms 18 Jul 2021 784th Heathcorp 🇦🇺 796 98 11ms 15 Feb 2022 784th markus-rekdal 796 98 15ms 10 May 2022 784th commandz0 🇺🇸 796 98 13ms 9 Sep 2022 784th Bmrl7 796 98 12ms 4 Mar 2024 784th alemelis 796 98 13ms 13 Sep 2024 784th jacekwladzinski 796 98 13ms 7 Oct 2025 784th LostSyntax21 🇬🇧 796 98 13ms 2 Dec 2025 794th Shanethegamer 🇺🇸 796 113 70ms 8 Jan 2025 795th Shanethegamer 🇺🇸 795 156 294ms 2 Nov 2024 796th DialFrost 🇸🇬 794 60 30ms 2 Aug 2025 797th GolfingSuccess 🇬🇷 794 132 3ms 6 Mar 2025 798th JRaspass 🇬🇧 793 48 3ms 11 Jul 2019 798th scpchicken 🇵🇼 793 48 4ms 9 Apr 2022 800th cafehaine 🇫🇷 793 93 3ms 27 Apr 2022 First Prev 721–800 of 1,902 Next Last