The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 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 721st Shanethegamer 🇺🇸 861 81 100ms 25 Mar 2023 722nd swbbl 860 76 289ms 5 Feb 2022 722nd thed1n 860 76 274ms 9 Jun 2022 722nd ehmiiz 🇸🇪 860 76 270ms 21 Jun 2022 722nd markroloff 860 76 262ms 24 Jul 2022 722nd Clebam 🇫🇷 860 76 280ms 26 Jul 2022 722nd KevinLaux 860 76 273ms 2 Nov 2022 722nd Tadas 860 76 250ms 23 Feb 2024 722nd MarkE0 860 76 266ms 30 Apr 2024 730th SirBogman 🇺🇸 860 110 134ms 4 Oct 2023 731st Alex-x90 🇺🇸 860 112 2ms 19 May 2023 731st JohandeRuiter 🇳🇱 860 112 2ms 27 Nov 2023 731st Bmrl7 860 112 3ms 27 Dec 2023 731st byronknoll 🇺🇸 860 112 2ms 21 Jan 2024 735th YPuest 859 93 6ms 15 Feb 2023 735th rus13th 859 93 5ms 4 Oct 2024 737th janAkali 🇷🇺 859 104 125ms 20 Feb 2026 738th MeWhenI 🇻🇦 858 47 50ms 28 Jul 2022 738th fuzzylojik-golf 🇺🇸 858 47 46ms 31 Aug 2025 740th Lydxn 🇨🇦 858 107 418ms 28 Apr 2022 740th Steffan153 🇫🇮 858 107 427ms 12 Feb 2023 740th feberhard 858 107 415ms 7 Apr 2023 740th sean-niemann 🇺🇸 858 107 425ms 20 Jun 2025 744th Shanethegamer 🇺🇸 858 121 468ms 13 Dec 2022 745th AlephSquirrel 857 133 4ms 2 Aug 2024 746th jared-hughes 857 139 440ms 24 Jun 2022 746th tim-trimble 857 139 66ms 4 Aug 2022 746th ZachClayburn 857 139 64ms 4 Aug 2022 746th SpacelessL 857 139 62ms 7 Apr 2024 750th snoozingnewt 🇨🇦 855 86 1,049ms 14 Oct 2025 751st sean-niemann 🇺🇸 855 126 38ms 24 Apr 2023 752nd thadonz 854 90 9ms 1 Mar 2022 752nd Efren071 854 90 10ms 14 Apr 2022 752nd mackereldev 854 90 10ms 28 Apr 2022 752nd destofr 854 90 10ms 23 Aug 2022 752nd jorduino 854 90 11ms 30 Oct 2022 752nd Zach10za 854 90 10ms 30 Nov 2022 752nd MFazio23 854 90 10ms 30 Nov 2022 752nd lxmarinkovic 854 90 10ms 3 Mar 2023 752nd ejini6969 854 90 10ms 25 Mar 2023 752nd quirked-up 854 90 10ms 30 Aug 2023 752nd MineRPi 854 90 12ms 31 Jul 2024 752nd xShadowBlade 854 90 9ms 20 Nov 2024 752nd Jaydosu 854 90 10ms 28 Apr 2025 752nd De1p0 854 90 10ms 16 Jun 2025 752nd Charlie85270 854 90 10ms 25 Jun 2025 752nd Voltrifrodec 🇸🇰 854 90 10ms 10 Nov 2025 752nd Cube14yt 854 90 11ms 12 Nov 2025 769th olleicua 🇺🇸 853 72 38ms 13 Feb 2024 770th MeWhenI 🇻🇦 853 90 7ms 18 Feb 2025 771st edsrzf 🇳🇿 853 127 21ms 8 Dec 2024 772nd tidalDisruptionEvent 🇨🇦 852 80 379ms 28 Mar 2023 772nd snoozingnewt 🇨🇦 852 80 525ms 14 Oct 2025 774th MeWhenI 🇻🇦 852 92 1ms 11 Nov 2022 774th stellartux 852 92 1ms 24 Dec 2023 774th alphafalfa 852 92 2ms 1 Aug 2025 777th MeWhenI 🇻🇦 852 110 121ms 15 Oct 2022 778th SirBogman 🇺🇸 851 109 1,291ms 9 Oct 2023 779th sean-niemann 🇺🇸 851 140 66ms 9 Feb 2022 779th arvidjonasson 851 140 63ms 7 Jun 2025 779th cjdyer 851 140 62ms 6 days ago 779th hazzery 851 140 59ms 6 days ago 783rd Herbert00709 🇵🇱 851 152 4ms 15 Jan 2025 784th edsrzf 🇳🇿 850 88 6ms 5 Dec 2024 785th satutalo 🇫🇮 850 94 5ms 22 Nov 2022 785th roslov 850 94 5ms 4 Oct 2024 785th SamAntUA 🇺🇦 850 94 5ms 8 Oct 2024 788th GrayJoKing 🇦🇺 850 100 14ms 17 Dec 2021 788th Lydxn 🇨🇦 850 100 15ms 10 Jan 2022 790th cryptoriddlerUIO 850 108 403ms 22 Mar 2025 790th bilal2709 850 108 438ms 19 Jan 2026 792nd GrayJoKing 🇦🇺 849 77 271ms 21 Nov 2021 793rd Shanethegamer 🇺🇸 848 119 2ms 25 Mar 2023 794th stefangimmillaro 847 89 1,290ms 2 Nov 2022 794th MeWhenI 🇻🇦 847 89 1,297ms 12 May 2023 794th inventshah 847 89 1,311ms 27 Sep 2023 794th Yewzir 🇧🇪 847 89 1,196ms 7 Feb 2024 794th anter69 🇭🇺 847 89 1,321ms 24 Oct 2024 799th sisyphus-ppcg 🇦🇺 846 56 2ms 13 Jan 2022 799th Bubbler-4 846 56 2ms 20 Jan 2022 First Prev 721–800 of 3,457 Next Last