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?
Foo Fizz Buzz Bar 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 480th sisyphus-ppcg 🇦🇺 893 105 136ms 19 Oct 2022 480th stefangimmillaro 893 105 121ms 19 Oct 2022 480th sean-niemann 🇺🇸 893 105 106ms 19 Mar 2025 484th MeWhenI 🇻🇦 893 113 12ms 29 Mar 2024 485th canissimia 🇦🇶 893 138 186ms 20 May 2023 486th GrayJoKing 🇦🇺 892 106 3ms 12 Sep 2022 486th Shanethegamer 🇺🇸 892 106 140ms 23 May 2023 486th btnlq 892 106 131ms 15 Oct 2023 489th ovs-code 🇩🇪 892 108 2ms 16 Feb 2023 490th emgordon154 892 145 4ms 15 Jan 2025 491st MeWhenI 🇻🇦 891 69 66ms 16 Aug 2022 492nd yzhs 🇩🇪 891 73 11ms 16 Jun 2022 492nd PrathamMehta08 891 73 45ms 6 Dec 2023 492nd ASampsonMu31 891 73 11ms 12 days ago 495th emgordon154 891 93 17ms 29 Jul 2025 496th SirBogman 🇺🇸 891 101 43ms 3 Jun 2025 497th tomtheisen 🇺🇸 891 103 419ms 27 Jan 2023 497th btnlq 891 103 432ms 2 Mar 2023 497th meinsiedler 891 103 413ms 7 Apr 2023 497th JayXon 🇺🇸 891 103 411ms 19 Jun 2023 497th nwellnhof 🇩🇪 891 103 423ms 14 Jul 2023 502nd emgordon154 891 113 154ms 30 Nov 2025 502nd frankgraziano 891 113 9ms 23 Feb 2026 502nd edsrzf 🇳🇿 891 113 8ms 27 days ago 502nd Steffan153 🇫🇮 891 113 9ms 26 days ago 502nd emgordon154 891 113 10ms 21 days ago 502nd GrayJoKing 🇦🇺 891 113 8ms 21 days ago 508th SirBogman 🇺🇸 891 121 40ms 19 Jun 2022 509th btnlq 891 128 3ms 15 Jul 2023 509th GrayJoKing 🇦🇺 891 128 3ms 25 Jul 2023 511th jared-hughes 891 141 18ms 20 Dec 2024 512th m-tkach 🇺🇦 891 164 80ms 25 Apr 2022 513th TeodorDyakov 🇧🇬 890 139 502ms 9 Jan 2026 514th inventshah 889 134 433ms 26 Jan 2023 515th Steffan153 🇫🇮 888 122 23ms 23 Aug 2024 516th Jacob385 887 70 407ms 4 Apr 2024 517th canissimia 🇦🇶 886 320 32ms 22 Nov 2023 518th sisyphus-ppcg 🇦🇺 885 114 2ms 12 Mar 2022 518th NickTheEASDude 🇺🇸 885 114 2ms 9 May 2024 520th GolfingSuccess 🇬🇷 885 120 5ms 11 days ago 521st janbehrens 🇩🇪 884 87 15ms 23 Nov 2021 521st igmcdowell 884 87 11ms 23 Nov 2021 521st ScottHamper 884 87 12ms 17 Dec 2021 521st Jazcash 884 87 13ms 22 Mar 2022 521st LukeBridges 🇬🇧 884 87 10ms 24 Oct 2022 521st Ephellon 884 87 12ms 2 Dec 2022 521st PatrickStephansen 🇿🇦 884 87 12ms 14 Dec 2022 521st DialFrost 🇸🇬 884 87 11ms 27 Jan 2023 521st Mazn3k 884 87 12ms 14 Feb 2023 521st a1exeysv 🇺🇦 884 87 11ms 15 Mar 2023 521st unfinishedprogram 884 87 12ms 30 Jun 2023 521st dylanarmstrong 884 87 12ms 14 Dec 2023 521st SadiinsoSnowfall 🇫🇷 884 87 11ms 16 Feb 2024 521st HumanoidCPU 884 87 12ms 14 Apr 2024 521st pardouin 🇫🇷 884 87 12ms 17 Aug 2024 521st duckyluuk 🇳🇱 884 87 11ms 3 Oct 2024 521st dokutan 884 87 12ms 3 Oct 2024 521st XenThe 🇬🇧 884 87 11ms 1 Jul 2025 521st helbling 🇨🇭 884 87 12ms 13 Aug 2025 521st Yax42 🇫🇷 884 87 13ms 19 Jan 2026 521st Lv0Sys 🇵🇱 884 87 11ms 25 days ago 542nd inventshah 884 107 3ms 12 Sep 2022 543rd emgordon154 884 109 3ms 30 Dec 2021 543rd m-tkach 🇺🇦 884 109 3ms 17 Jan 2022 543rd inventshah 884 109 2ms 20 May 2023 546th SirBogman 🇺🇸 884 129 4ms 16 Jul 2023 547th emgordon154 884 140 383ms 9 Feb 2026 548th lifthrasiir 🇰🇷 884 142 8ms 24 Nov 2024 549th retrohun 883 72 249ms 6 Oct 2024 550th Steffan153 🇫🇮 881 90 8ms 7 Feb 2023 551st Yewzir 🇧🇪 880 87 2ms 18 Jan 2024 552nd sisyphus-ppcg 🇦🇺 880 147 4ms 15 Jan 2025 553rd Natanaelel 🇸🇪 879 56 117ms 43 hours ago 554th pythonNoobOz 879 74 12ms 20 Apr 2023 555th anter69 🇭🇺 878 70 37ms 2 Apr 2024 555th tatzyr 🇯🇵 878 70 38ms 13 Nov 2024 557th Steffan153 🇫🇮 878 121 4ms 5 days ago 557th MeWhenI 🇻🇦 878 121 4ms 5 days ago 559th ovs-code 🇩🇪 878 143 8ms 7 Jul 2024 560th frankgraziano 878 245 17ms 20 Aug 2025 First Prev 481–560 of 3,459 Next Last
