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 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 721st MeWhenI 🇻🇦 812 78 141ms 3 Aug 2024 721st Shanethegamer 🇺🇸 812 78 178ms 8 Jan 2025 721st voytxt 🇨🇿 812 78 148ms 17 Apr 2025 724th Lv0Sys 🇵🇱 812 99 2ms 3 Dec 2025 725th roavin 812 101 419ms 23 Jun 2022 726th GrayJoKing 🇦🇺 812 140 178ms 8 Dec 2020 726th Hillsoft 812 140 166ms 27 Jul 2022 728th albanian-laundromat 812 224 1,484ms 15 Oct 2025 729th janbehrens 🇩🇪 811 66 265ms 5 Dec 2023 730th Yewzir 🇧🇪 811 83 4ms 8 Jun 2024 730th rucin93 🇵🇱 811 83 4ms 23 Apr 2025 732nd RockOfStone 811 91 3ms 4 Nov 2021 733rd Steffan153 🇫🇮 811 126 79ms 6 days ago 734th MeWhenI 🇻🇦 810 47 4ms 16 Apr 2023 735th JulianJJ 810 79 12ms 7 Dec 2020 735th xkacer 🇨🇿 810 79 13ms 31 Jan 2021 735th Ephellon 810 79 12ms 4 Dec 2022 735th Mazn3k 810 79 15ms 2 Mar 2023 735th stefangabos 🇷🇴 810 79 12ms 14 May 2023 735th jak-ch-ll 810 79 12ms 5 Jul 2025 741st Shanethegamer 🇺🇸 810 94 2,833ms 28 Oct 2024 741st sean-niemann 🇺🇸 810 94 2,744ms 7 Jan 2026 743rd ovs-code 🇩🇪 810 135 157ms 21 Jun 2023 744th b97tsk 810 153 310ms 26 Apr 2020 744th argusdusty 🇺🇸 810 153 291ms 21 Aug 2022 746th janbehrens 🇩🇪 809 123 468ms 5 Dec 2023 747th stefangimmillaro 807 139 42ms 26 Apr 2025 748th sean-niemann 🇺🇸 806 130 3ms 18 Jan 2025 749th edsrzf 🇳🇿 805 70 6ms 8 Nov 2025 750th toombs-caeman 804 97 22ms 8 Mar 2020 750th Fargeol 804 97 12ms 17 Nov 2021 750th vishwathg 804 97 13ms 7 Apr 2023 750th bnic24 804 97 12ms 22 Aug 2024 750th albanian-laundromat 804 97 13ms 29 Aug 2025 755th iczelia 🇩🇪 804 100 2ms 16 Oct 2025 756th amazingalek 🇳🇴 804 102 455ms 1 Jan 2026 757th primo-ppcg 🇹🇭 803 75 9ms 4 Jul 2023 757th xsot 🇸🇬 803 75 10ms 13 Apr 2024 757th targrik 803 75 8ms 9 Sep 2025 760th GrayJoKing 🇦🇺 802 79 156ms 4 Aug 2024 760th pardouin 🇫🇷 802 79 166ms 17 Apr 2025 762nd SirBogman 🇺🇸 801 58 33ms 5 Jan 2020 763rd AlephSquirrel 801 82 442ms 21 Jan 2024 764th LukeBridges 🇬🇧 800 80 16ms 4 Nov 2022 764th AlephSquirrel 800 80 11ms 6 Jan 2023 764th junkondo-jp 800 80 11ms 2 Jun 2024 764th alexsave 800 80 11ms 7 Nov 2024 768th tuffnatty 🇩🇪 800 104 11ms 20 Jul 2023 769th MeWhenI 🇻🇦 800 131 3ms 10 Sep 2022 769th GrayJoKing 🇦🇺 800 131 3ms 11 Sep 2022 771st laikoni 800 142 177ms 21 Sep 2019 771st tobeannouncd 800 142 177ms 9 Jan 2024 773rd yzzyx 800 155 271ms 18 Apr 2020 774th TimCurwick 🇺🇸 799 67 311ms 29 Sep 2020 774th hasan1st 799 67 297ms 28 May 2022 774th juliansiebert 🇩🇪 799 67 268ms 10 Nov 2024 774th madex 🇩🇪 799 67 330ms 13 days ago 778th Bubbler-4 798 41 3ms 19 Jan 2022 778th rak1507 🇬🇧 798 41 3ms 2 Jan 2023 780th pzagrebin 798 66 49ms 26 Jul 2022 781st lynn 798 137 165ms 31 Mar 2022 781st Shanethegamer 🇺🇸 798 137 30ms 10 Feb 2026 783rd iznax 797 103 388ms 21 Nov 2021 784th raphaelimahorn 797 126 383ms 17 days ago 785th dzhang314 796 98 12ms 16 Sep 2019 785th 77Tigers 796 98 12ms 11 Mar 2021 785th bbakersmith 796 98 13ms 18 Jul 2021 785th Heathcorp 🇦🇺 796 98 11ms 15 Feb 2022 785th markus-rekdal 796 98 15ms 10 May 2022 785th commandz0 🇺🇸 796 98 13ms 9 Sep 2022 785th Bmrl7 796 98 12ms 4 Mar 2024 785th alemelis 796 98 13ms 13 Sep 2024 785th jacekwladzinski 796 98 13ms 7 Oct 2025 785th LostSyntax21 🇬🇧 796 98 13ms 2 Dec 2025 795th Shanethegamer 🇺🇸 796 113 70ms 8 Jan 2025 796th Shanethegamer 🇺🇸 795 156 294ms 2 Nov 2024 797th DialFrost 🇸🇬 794 60 30ms 2 Aug 2025 798th GolfingSuccess 🇬🇷 794 132 3ms 6 Mar 2025 799th JRaspass 🇬🇧 793 48 3ms 11 Jul 2019 799th scpchicken 🇵🇼 793 48 4ms 9 Apr 2022 First Prev 721–800 of 1,904 Next Last