The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 31 hours. 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 481st Shanethegamer 🇺🇸 893 105 112ms 15 Oct 2022 481st sisyphus-ppcg 🇦🇺 893 105 136ms 19 Oct 2022 481st stefangimmillaro 893 105 121ms 19 Oct 2022 481st sean-niemann 🇺🇸 893 105 106ms 19 Mar 2025 485th MeWhenI 🇻🇦 893 113 12ms 29 Mar 2024 486th canissimia 🇦🇶 893 138 186ms 20 May 2023 487th m-tkach 🇺🇦 893 164 80ms 25 Apr 2022 488th GrayJoKing 🇦🇺 892 106 3ms 12 Sep 2022 488th Shanethegamer 🇺🇸 892 106 140ms 23 May 2023 488th btnlq 892 106 131ms 15 Oct 2023 491st ovs-code 🇩🇪 892 108 2ms 16 Feb 2023 492nd emgordon154 892 145 4ms 15 Jan 2025 493rd MeWhenI 🇻🇦 891 69 66ms 16 Aug 2022 494th yzhs 🇩🇪 891 73 11ms 16 Jun 2022 494th PrathamMehta08 891 73 45ms 6 Dec 2023 494th ASampsonMu31 891 73 11ms 17 days ago 497th emgordon154 891 93 17ms 29 Jul 2025 498th SirBogman 🇺🇸 891 101 43ms 3 Jun 2025 499th tomtheisen 🇺🇸 891 103 419ms 27 Jan 2023 499th btnlq 891 103 432ms 2 Mar 2023 499th meinsiedler 891 103 413ms 7 Apr 2023 499th JayXon 🇺🇸 891 103 411ms 19 Jun 2023 499th nwellnhof 🇩🇪 891 103 423ms 14 Jul 2023 504th emgordon154 891 113 154ms 30 Nov 2025 504th frankgraziano 891 113 9ms 23 Feb 2026 504th edsrzf 🇳🇿 891 113 8ms 25 Feb 2026 504th Steffan153 🇫🇮 891 113 9ms 26 Feb 2026 504th emgordon154 891 113 10ms 26 days ago 504th GrayJoKing 🇦🇺 891 113 8ms 26 days ago 510th SirBogman 🇺🇸 891 121 40ms 19 Jun 2022 511th btnlq 891 128 3ms 15 Jul 2023 511th GrayJoKing 🇦🇺 891 128 3ms 25 Jul 2023 513th jared-hughes 891 141 18ms 20 Dec 2024 514th TeodorDyakov 🇧🇬 890 139 502ms 9 Jan 2026 515th inventshah 889 134 433ms 26 Jan 2023 516th Steffan153 🇫🇮 888 122 23ms 23 Aug 2024 517th Jacob385 887 70 407ms 4 Apr 2024 518th canissimia 🇦🇶 886 320 32ms 22 Nov 2023 519th sisyphus-ppcg 🇦🇺 885 114 2ms 12 Mar 2022 519th NickTheEASDude 🇺🇸 885 114 2ms 9 May 2024 521st GolfingSuccess 🇬🇷 885 120 5ms 16 days ago 522nd janbehrens 🇩🇪 884 87 15ms 23 Nov 2021 522nd igmcdowell 884 87 11ms 23 Nov 2021 522nd ScottHamper 884 87 12ms 17 Dec 2021 522nd Jazcash 884 87 13ms 22 Mar 2022 522nd LukeBridges 🇬🇧 884 87 10ms 24 Oct 2022 522nd Ephellon 884 87 12ms 2 Dec 2022 522nd PatrickStephansen 🇿🇦 884 87 12ms 14 Dec 2022 522nd DialFrost 🇸🇬 884 87 11ms 27 Jan 2023 522nd Mazn3k 884 87 12ms 14 Feb 2023 522nd a1exeysv 🇺🇦 884 87 11ms 15 Mar 2023 522nd unfinishedprogram 884 87 12ms 30 Jun 2023 522nd dylanarmstrong 884 87 12ms 14 Dec 2023 522nd SadiinsoSnowfall 🇫🇷 884 87 11ms 16 Feb 2024 522nd HumanoidCPU 884 87 12ms 14 Apr 2024 522nd pardouin 🇫🇷 884 87 12ms 17 Aug 2024 522nd duckyluuk 🇳🇱 884 87 11ms 3 Oct 2024 522nd dokutan 884 87 12ms 3 Oct 2024 522nd XenThe 🇬🇧 884 87 11ms 1 Jul 2025 522nd helbling 🇨🇭 884 87 12ms 13 Aug 2025 522nd Yax42 🇫🇷 884 87 13ms 19 Jan 2026 522nd Lv0Sys 🇵🇱 884 87 11ms 27 Feb 2026 543rd inventshah 884 107 3ms 12 Sep 2022 544th emgordon154 884 109 3ms 30 Dec 2021 544th m-tkach 🇺🇦 884 109 3ms 17 Jan 2022 544th inventshah 884 109 2ms 20 May 2023 547th SirBogman 🇺🇸 884 129 4ms 16 Jul 2023 548th emgordon154 884 140 383ms 9 Feb 2026 549th lifthrasiir 🇰🇷 884 142 8ms 24 Nov 2024 550th retrohun 883 72 249ms 6 Oct 2024 551st Steffan153 🇫🇮 881 90 8ms 7 Feb 2023 552nd Yewzir 🇧🇪 880 87 2ms 18 Jan 2024 553rd sisyphus-ppcg 🇦🇺 880 147 4ms 15 Jan 2025 554th Natanaelel 🇸🇪 879 56 117ms 6 days ago 555th pythonNoobOz 879 74 12ms 20 Apr 2023 556th anter69 🇭🇺 878 70 37ms 2 Apr 2024 556th tatzyr 🇯🇵 878 70 38ms 13 Nov 2024 558th Steffan153 🇫🇮 878 121 4ms 10 days ago 558th MeWhenI 🇻🇦 878 121 4ms 10 days ago 560th ovs-code 🇩🇪 878 143 8ms 7 Jul 2024 First Prev 481–560 of 3,465 Next Last
