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 797th anter69 🇭🇺 847 89 1,321ms 24 Oct 2024 802nd emplv 🇱🇻 847 173 81ms 28 Mar 2023 803rd sisyphus-ppcg 🇦🇺 846 56 2ms 13 Jan 2022 803rd Bubbler-4 846 56 2ms 20 Jan 2022 803rd sean-niemann 🇺🇸 846 56 3ms 10 Jul 2024 803rd gnuvince 846 56 2ms 1 Aug 2024 807th Anonymousellama21 845 77 12ms 30 Nov 2021 807th commandz0 🇺🇸 845 77 13ms 22 Aug 2023 809th BrettMerri 845 91 12ms 8 Apr 2022 809th elisherer 🇮🇱 845 91 10ms 5 Jun 2022 809th eranws 845 91 13ms 29 Sep 2022 809th joFra210 845 91 12ms 19 Nov 2022 809th stop-amertime 845 91 14ms 2 Dec 2022 809th jciurc 845 91 10ms 23 Feb 2023 809th sulphemi 845 91 11ms 5 Oct 2023 809th barneyb 845 91 11ms 14 Oct 2023 817th SirBogman 🇺🇸 845 114 3ms 28 Nov 2021 817th nai62 845 114 3ms 28 Aug 2022 819th keelimeguy 🇺🇸 845 141 63ms 19 Oct 2023 820th primo-ppcg 🇹🇭 844 87 1,031ms 4 Feb 2022 821st Shanethegamer 🇺🇸 843 106 119ms 25 Mar 2023 822nd sisyphus-ppcg 🇦🇺 842 81 344ms 22 Nov 2021 823rd lynn 842 101 10ms 22 Nov 2021 824th Gaddy 🇫🇷 842 109 394ms 9 May 2022 824th Romain-1 🇫🇷 842 109 393ms 9 May 2022 824th postie77 842 109 384ms 23 Feb 2023 824th annaproxy 842 109 441ms 12 Jun 2023 828th jb-lopez 🇺🇸 841 95 5ms 19 Apr 2022 828th rollershutter 841 95 5ms 5 Jul 2024 828th aloskutov 🇷🇺 841 95 5ms 7 Jan 2025 831st GolfingSuccess 🇬🇷 840 48 57ms 20 Nov 2025 832nd rvdnieuwendijk 🇳🇱 838 78 282ms 27 Nov 2021 833rd NewDefectus 🇮🇱 838 115 3ms 22 Nov 2021 833rd ZachClayburn 838 115 2ms 4 Aug 2022 833rd tim-trimble 838 115 2ms 4 Aug 2022 833rd KatieLG 🇬🇧 838 115 89ms 14 Jan 2023 837th MeWhenI 🇻🇦 837 99 14ms 9 May 2024 838th DialFrost 🇸🇬 837 113 2ms 23 Jan 2026 839th MeWhenI 🇻🇦 837 124 456ms 10 Oct 2022 840th Shanethegamer 🇺🇸 837 197 1,464ms 24 Apr 2025 841st zaneshaw 836 92 11ms 27 Apr 2022 841st GeorgeStechman 🇬🇧 836 92 11ms 14 May 2022 841st Heathcorp 🇦🇺 836 92 11ms 9 Jul 2022 841st zlpeak 836 92 10ms 26 Jul 2022 841st 7f-galaxii 836 92 12ms 6 Dec 2022 841st NoUselessTech 836 92 10ms 11 Dec 2022 841st A11yship 836 92 12ms 31 Oct 2023 841st lewdev 🇺🇸 836 92 12ms 28 Nov 2023 841st r-schmidtke 836 92 16ms 25 Apr 2024 841st johnkiernander 836 92 11ms 15 Dec 2025 851st SirBogman 🇺🇸 835 107 121ms 15 Dec 2021 852nd Isaac-Metthez 834 78 11ms 19 Dec 2023 852nd yokasuretsu 834 78 12ms 9 Jan 2025 854th GrayJoKing 🇦🇺 834 110 426ms 21 Nov 2021 854th primo-ppcg 🇹🇭 834 110 410ms 22 Nov 2021 854th ScottHamper 834 110 418ms 17 Dec 2021 854th billings7 🇬🇧 834 110 406ms 16 Apr 2022 854th Matgc04 834 110 426ms 19 May 2023 854th BREMAUCY 🇫🇷 834 110 390ms 30 Jun 2023 854th SirBogman 🇺🇸 834 110 401ms 20 Oct 2023 854th namelessiw 834 110 429ms 4 May 2024 854th pardouin 🇫🇷 834 110 373ms 17 Aug 2024 854th juliansiebert 🇩🇪 834 110 410ms 2 Mar 2025 854th kylejcwu 834 110 405ms 23 Apr 2025 854th Adix-null 🇱🇹 834 110 415ms 9 Nov 2025 866th dokutan 834 121 2ms 29 Mar 2025 866th SwordF-Official 🇺🇸 834 121 3ms 1 Jun 2025 868th Shanethegamer 🇺🇸 833 143 62ms 14 Sep 2022 869th Yewzir 🇧🇪 833 218 1,955ms 15 Nov 2025 870th primo-ppcg 🇹🇭 833 258 224ms 30 Aug 2023 871st MeWhenI 🇻🇦 832 57 2ms 12 Jan 2022 871st aksyristos 832 57 3ms 22 Oct 2022 871st Steffan153 🇫🇮 832 57 2ms 26 Feb 2023 871st Yewzir 🇧🇪 832 57 2ms 10 Dec 2023 871st DialFrost 🇸🇬 832 57 2ms 3 Feb 2024 871st GolfinK 832 57 2ms 22 Nov 2024 871st lifthrasiir 🇰🇷 832 57 2ms 29 Nov 2024 871st scpchicken 🇵🇼 832 57 3ms 19 days ago 879th ArekX 832 96 4ms 11 May 2022 880th SirBogman 🇺🇸 831 134 24ms 4 Oct 2023 First Prev 801–880 of 3,465 Next Last