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 800th Bubbler-4 846 56 2ms 20 Jan 2022 800th sean-niemann 🇺🇸 846 56 3ms 10 Jul 2024 800th gnuvince 846 56 2ms 1 Aug 2024 804th Anonymousellama21 845 77 12ms 30 Nov 2021 804th commandz0 🇺🇸 845 77 13ms 22 Aug 2023 806th BrettMerri 845 91 10ms 8 Apr 2022 806th elisherer 🇮🇱 845 91 10ms 5 Jun 2022 806th eranws 845 91 12ms 29 Sep 2022 806th joFra210 845 91 9ms 19 Nov 2022 806th stop-amertime 845 91 10ms 2 Dec 2022 806th jciurc 845 91 9ms 23 Feb 2023 806th sulphemi 845 91 10ms 5 Oct 2023 806th barneyb 845 91 10ms 14 Oct 2023 806th madeforlosers 845 91 10ms 23 Oct 2024 815th SirBogman 🇺🇸 845 114 3ms 28 Nov 2021 815th nai62 845 114 3ms 28 Aug 2022 817th keelimeguy 🇺🇸 845 141 54ms 19 Oct 2023 818th emplv 🇱🇻 845 173 81ms 28 Mar 2023 819th primo-ppcg 🇹🇭 844 87 1,031ms 4 Feb 2022 820th Shanethegamer 🇺🇸 843 106 119ms 25 Mar 2023 821st sisyphus-ppcg 🇦🇺 842 81 344ms 22 Nov 2021 822nd lynn 842 101 10ms 22 Nov 2021 823rd Gaddy 🇫🇷 842 109 394ms 9 May 2022 823rd Romain-1 🇫🇷 842 109 393ms 9 May 2022 823rd postie77 842 109 384ms 23 Feb 2023 823rd annaproxy 842 109 441ms 12 Jun 2023 827th jb-lopez 🇺🇸 841 95 5ms 19 Apr 2022 827th rollershutter 841 95 5ms 5 Jul 2024 827th aloskutov 🇷🇺 841 95 5ms 7 Jan 2025 830th GolfingSuccess 🇬🇷 840 48 57ms 20 Nov 2025 831st rvdnieuwendijk 🇳🇱 838 78 282ms 27 Nov 2021 832nd NewDefectus 🇮🇱 838 115 3ms 22 Nov 2021 832nd ZachClayburn 838 115 2ms 4 Aug 2022 832nd tim-trimble 838 115 2ms 4 Aug 2022 832nd KatieLG 🇬🇧 838 115 83ms 14 Jan 2023 836th MeWhenI 🇻🇦 837 99 14ms 9 May 2024 837th DialFrost 🇸🇬 837 113 2ms 23 Jan 2026 838th MeWhenI 🇻🇦 837 124 456ms 10 Oct 2022 839th Shanethegamer 🇺🇸 837 197 1,425ms 24 Apr 2025 840th zaneshaw 836 92 10ms 27 Apr 2022 840th GeorgeStechman 🇬🇧 836 92 10ms 14 May 2022 840th Heathcorp 🇦🇺 836 92 10ms 9 Jul 2022 840th zlpeak 836 92 10ms 26 Jul 2022 840th 7f-galaxii 836 92 10ms 6 Dec 2022 840th NoUselessTech 836 92 10ms 11 Dec 2022 840th A11yship 836 92 12ms 31 Oct 2023 840th lewdev 🇺🇸 836 92 12ms 28 Nov 2023 840th r-schmidtke 836 92 10ms 25 Apr 2024 840th johnkiernander 836 92 10ms 15 Dec 2025 850th SirBogman 🇺🇸 835 107 121ms 15 Dec 2021 851st Isaac-Metthez 834 78 11ms 19 Dec 2023 851st yokasuretsu 834 78 12ms 9 Jan 2025 853rd GrayJoKing 🇦🇺 834 110 426ms 21 Nov 2021 853rd primo-ppcg 🇹🇭 834 110 410ms 22 Nov 2021 853rd ScottHamper 834 110 418ms 17 Dec 2021 853rd billings7 🇬🇧 834 110 406ms 16 Apr 2022 853rd Matgc04 834 110 426ms 19 May 2023 853rd BREMAUCY 🇫🇷 834 110 390ms 30 Jun 2023 853rd SirBogman 🇺🇸 834 110 401ms 20 Oct 2023 853rd namelessiw 834 110 429ms 4 May 2024 853rd pardouin 🇫🇷 834 110 373ms 17 Aug 2024 853rd juliansiebert 🇩🇪 834 110 410ms 2 Mar 2025 853rd kylejcwu 834 110 405ms 23 Apr 2025 853rd Adix-null 🇱🇹 834 110 415ms 9 Nov 2025 865th dokutan 834 121 2ms 29 Mar 2025 865th SwordF-Official 🇺🇸 834 121 3ms 1 Jun 2025 867th Shanethegamer 🇺🇸 833 143 59ms 14 Sep 2022 868th Yewzir 🇧🇪 833 218 1,955ms 15 Nov 2025 869th primo-ppcg 🇹🇭 833 258 224ms 30 Aug 2023 870th MeWhenI 🇻🇦 832 57 2ms 12 Jan 2022 870th aksyristos 832 57 3ms 22 Oct 2022 870th Steffan153 🇫🇮 832 57 2ms 26 Feb 2023 870th Yewzir 🇧🇪 832 57 2ms 10 Dec 2023 870th DialFrost 🇸🇬 832 57 2ms 3 Feb 2024 870th GolfinK 832 57 2ms 22 Nov 2024 870th lifthrasiir 🇰🇷 832 57 2ms 29 Nov 2024 870th scpchicken 🇵🇼 832 57 3ms 14 days ago 878th ArekX 832 96 4ms 11 May 2022 879th SirBogman 🇺🇸 831 134 24ms 4 Oct 2023 880th KrausRaus 🇺🇸 829 113 124ms 17 Oct 2022 First Prev 801–880 of 3,458 Next Last
