The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 479th stefangimmillaro 893 105 121ms 19 Oct 2022 479th sean-niemann 🇺🇸 893 105 106ms 19 Mar 2025 483rd MeWhenI 🇻🇦 893 113 12ms 29 Mar 2024 484th canissimia 🇦🇶 893 138 186ms 20 May 2023 485th GrayJoKing 🇦🇺 892 106 3ms 12 Sep 2022 485th Shanethegamer 🇺🇸 892 106 140ms 23 May 2023 485th btnlq 892 106 131ms 15 Oct 2023 488th ovs-code 🇩🇪 892 108 2ms 16 Feb 2023 489th emgordon154 892 145 4ms 15 Jan 2025 490th MeWhenI 🇻🇦 891 69 66ms 16 Aug 2022 491st yzhs 🇩🇪 891 73 11ms 16 Jun 2022 491st PrathamMehta08 891 73 45ms 6 Dec 2023 491st ASampsonMu31 891 73 11ms 11 days ago 494th emgordon154 891 93 17ms 29 Jul 2025 495th SirBogman 🇺🇸 891 101 43ms 3 Jun 2025 496th tomtheisen 🇺🇸 891 103 419ms 27 Jan 2023 496th btnlq 891 103 432ms 2 Mar 2023 496th meinsiedler 891 103 413ms 7 Apr 2023 496th JayXon 🇺🇸 891 103 411ms 19 Jun 2023 496th nwellnhof 🇩🇪 891 103 423ms 14 Jul 2023 501st emgordon154 891 113 154ms 30 Nov 2025 501st frankgraziano 891 113 9ms 23 Feb 2026 501st edsrzf 🇳🇿 891 113 9ms 26 days ago 501st Steffan153 🇫🇮 891 113 11ms 25 days ago 501st emgordon154 891 113 10ms 20 days ago 501st GrayJoKing 🇦🇺 891 113 9ms 20 days ago 507th SirBogman 🇺🇸 891 121 40ms 19 Jun 2022 508th btnlq 891 128 3ms 15 Jul 2023 508th GrayJoKing 🇦🇺 891 128 3ms 25 Jul 2023 510th jared-hughes 891 141 18ms 20 Dec 2024 511th m-tkach 🇺🇦 891 164 80ms 25 Apr 2022 512th TeodorDyakov 🇧🇬 890 139 502ms 9 Jan 2026 513th inventshah 889 134 450ms 26 Jan 2023 514th Steffan153 🇫🇮 888 122 23ms 23 Aug 2024 515th Jacob385 887 70 407ms 4 Apr 2024 516th canissimia 🇦🇶 886 320 32ms 22 Nov 2023 517th sisyphus-ppcg 🇦🇺 885 114 2ms 12 Mar 2022 517th NickTheEASDude 🇺🇸 885 114 2ms 9 May 2024 519th GolfingSuccess 🇬🇷 885 120 5ms 10 days ago 520th janbehrens 🇩🇪 884 87 10ms 23 Nov 2021 520th igmcdowell 884 87 11ms 23 Nov 2021 520th ScottHamper 884 87 11ms 17 Dec 2021 520th Jazcash 884 87 9ms 22 Mar 2022 520th LukeBridges 🇬🇧 884 87 11ms 24 Oct 2022 520th Ephellon 884 87 11ms 2 Dec 2022 520th PatrickStephansen 🇿🇦 884 87 14ms 14 Dec 2022 520th DialFrost 🇸🇬 884 87 10ms 27 Jan 2023 520th Mazn3k 884 87 14ms 14 Feb 2023 520th a1exeysv 🇺🇦 884 87 10ms 15 Mar 2023 520th unfinishedprogram 884 87 10ms 30 Jun 2023 520th dylanarmstrong 884 87 11ms 14 Dec 2023 520th SadiinsoSnowfall 🇫🇷 884 87 11ms 16 Feb 2024 520th HumanoidCPU 884 87 10ms 14 Apr 2024 520th pardouin 🇫🇷 884 87 9ms 17 Aug 2024 520th duckyluuk 🇳🇱 884 87 11ms 3 Oct 2024 520th dokutan 884 87 10ms 3 Oct 2024 520th XenThe 🇬🇧 884 87 9ms 1 Jul 2025 520th helbling 🇨🇭 884 87 11ms 13 Aug 2025 520th Yax42 🇫🇷 884 87 11ms 19 Jan 2026 520th Lv0Sys 🇵🇱 884 87 11ms 25 days ago 541st inventshah 884 107 3ms 12 Sep 2022 542nd emgordon154 884 109 3ms 30 Dec 2021 542nd m-tkach 🇺🇦 884 109 3ms 17 Jan 2022 542nd inventshah 884 109 2ms 20 May 2023 545th SirBogman 🇺🇸 884 129 4ms 16 Jul 2023 546th emgordon154 884 140 383ms 9 Feb 2026 547th lifthrasiir 🇰🇷 884 142 8ms 24 Nov 2024 548th retrohun 883 72 249ms 6 Oct 2024 549th Steffan153 🇫🇮 881 90 8ms 7 Feb 2023 550th Yewzir 🇧🇪 880 87 2ms 18 Jan 2024 551st sisyphus-ppcg 🇦🇺 880 147 4ms 15 Jan 2025 552nd Natanaelel 🇸🇪 879 56 118ms 21 hours ago 553rd pythonNoobOz 879 74 12ms 20 Apr 2023 554th anter69 🇭🇺 878 70 37ms 2 Apr 2024 554th tatzyr 🇯🇵 878 70 38ms 13 Nov 2024 556th Steffan153 🇫🇮 878 121 4ms 4 days ago 556th MeWhenI 🇻🇦 878 121 4ms 4 days ago 558th ovs-code 🇩🇪 878 143 8ms 7 Jul 2024 559th frankgraziano 878 245 17ms 20 Aug 2025 560th primo-ppcg 🇹🇭 877 46 50ms 9 Dec 2022 First Prev 481–560 of 3,458 Next Last
