The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 26 hours. Why not try and solve them ahead of time?
φ 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 481st DialFrost 🇸🇬 877 37 1,558ms 24 Mar 2025 482nd emplv 🇱🇻 877 81 129ms 11 Apr 2023 483rd Steffan153 🇫🇮 877 84 601ms 23 Jul 2024 483rd sean-niemann 🇺🇸 877 84 554ms 14 Mar 2025 485th ovs-code 🇩🇪 877 165 2,845ms 1 Jul 2025 486th marcin7Cd 876 57 5ms 8 Feb 2021 486th AlephSquirrel 876 57 5ms 3 Oct 2024 488th galloj 🇨🇿 876 59 221ms 25 Jan 2021 488th vezzick 876 59 470ms 7 Mar 2021 488th petroselo 876 59 10ms 16 Nov 2021 488th guilhem-roy 🇫🇷 876 59 10ms 22 Feb 2022 488th MichalMarsalek 🇨🇿 876 59 9ms 5 Nov 2022 488th dusmart 876 59 80ms 11 Apr 2023 488th SB-945 876 59 25ms 2 Feb 2024 488th fgrosshans 🇫🇷 876 59 77ms 15 Jul 2024 488th edsrzf 🇳🇿 876 59 9ms 2 Jan 2025 488th ImpressedByRocks 876 59 51ms 23 May 2025 488th wuduculfre 876 59 10ms 22 Jul 2025 499th jared-hughes 874 55 28ms 6 Oct 2021 499th GeorgeStechman 🇬🇧 874 55 157ms 17 Jun 2022 499th two-bad 🇬🇧 874 55 63ms 4 Dec 2023 499th Lv0Sys 🇵🇱 874 55 28ms 8 Jun 2025 503rd inventshah 874 673 18ms 18 Nov 2022 504th DialFrost 🇸🇬 873 51 369ms 29 Jul 2024 504th Steffan153 🇫🇮 873 51 799ms 10 Aug 2024 506th MeWhenI 🇻🇦 872 44 38ms 14 Feb 2025 506th DialFrost 🇸🇬 872 44 40ms 15 Feb 2025 508th primo-ppcg 🇹🇭 871 153 205ms 20 Jan 2022 509th stefangimmillaro 870 104 457ms 16 Sep 2023 510th jared-hughes 869 119 8ms 23 Sep 2025 511th fuzzylojik-golf 🇺🇸 868 95 483ms 9 Jan 2026 512th andersk 🇺🇸 867 165 144ms 29 Nov 2022 512th ovs-code 🇩🇪 867 165 140ms 23 Apr 2025 514th emgordon154 866 137 1,446ms 28 Mar 2025 515th primo-ppcg 🇹🇭 866 145 1,715ms 15 Sep 2025 516th sean-niemann 🇺🇸 865 124 130ms 25 Dec 2025 516th Steffan153 🇫🇮 865 124 96ms 18 Feb 2026 518th iczelia 🇩🇪 864 35 56ms 14 Oct 2025 519th lifthrasiir 🇰🇷 863 58 430ms 3 Dec 2024 519th FortuiteMan 🇫🇷 863 58 157ms 29 Sep 2025 519th Babafaba 863 58 391ms 4 Nov 2025 522nd geofft 862 60 10ms 13 Dec 2020 522nd SniperSmiley 🇺🇸 862 60 80ms 1 Jun 2022 522nd glesnick 862 60 28ms 18 Aug 2022 522nd FlorianCassayre 🇫🇷 862 60 83ms 8 Nov 2022 522nd inverseLorentz 🇦🇺 862 60 72ms 10 Apr 2024 527th Lydxn 🇨🇦 861 58 5ms 6 Jul 2022 527th Steffan153 🇫🇮 861 58 4ms 5 Mar 2023 527th fuzzylojik-golf 🇺🇸 861 58 5ms 4 Aug 2025 530th ovs-code 🇩🇪 860 92 249ms 23 Feb 2025 531st MeWhenI 🇻🇦 859 44 3ms 20 Aug 2024 532nd andersk 🇺🇸 859 56 25ms 21 Mar 2020 532nd AlephSquirrel 859 56 12ms 15 Nov 2021 534th sean-niemann 🇺🇸 859 96 452ms 25 Sep 2025 534th kmathis22 859 96 487ms 10 Nov 2025 536th galloj 🇨🇿 859 685 92ms 1 Mar 2023 537th DialFrost 🇸🇬 858 125 128ms 23 Dec 2025 538th emgordon154 855 62 1,320ms 14 Oct 2025 539th fuzzylojik-golf 🇺🇸 854 38 1,679ms 14 Sep 2025 539th snoozingnewt 🇨🇦 854 38 1,669ms 16 Oct 2025 541st Indivicivet 854 42 164ms 30 Mar 2021 542nd MeWhenI 🇻🇦 854 106 486ms 8 Dec 2022 543rd MeWhenI 🇻🇦 853 69 1,419ms 8 Jun 2023 544th ZakkkkAttackkkk 🇵🇭 852 27 48ms 26 Dec 2021 544th j-Ewan 852 27 48ms 17 Mar 2022 546th Steffan153 🇫🇮 852 204 1,414ms 9 days ago 547th MeWhenI 🇻🇦 851 93 243ms 17 Nov 2022 548th daedals 848 61 26ms 5 Jun 2019 548th argusdusty 🇺🇸 848 61 10ms 31 Dec 2020 548th jiaminglimjm 🇲🇾 848 61 10ms 9 Jan 2021 548th commandz0 🇺🇸 848 61 10ms 6 Sep 2022 548th falsidge 848 61 9ms 20 Jun 2023 548th piano-miles 848 61 10ms 30 Dec 2023 548th mathisfun271 848 61 10ms 13 Feb 2024 555th DialFrost 🇸🇬 846 107 572ms 22 Jul 2025 556th edsrzf 🇳🇿 844 104 209ms 7 Dec 2025 557th DialFrost 🇸🇬 844 113 263ms 24 Sep 2024 558th BBoehm 🇩🇪 843 57 27ms 24 Feb 2021 558th MeWhenI 🇻🇦 843 57 29ms 28 Sep 2021 558th CaedenHarper 🇨🇦 843 57 28ms 15 Aug 2025 First Prev 481–560 of 2,518 Next Last