The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 720th emgordon154 862 55 3ms 3 Nov 2024 722nd Shanethegamer 🇺🇸 861 81 100ms 25 Mar 2023 723rd swbbl 860 76 289ms 5 Feb 2022 723rd thed1n 860 76 274ms 9 Jun 2022 723rd ehmiiz 🇸🇪 860 76 270ms 21 Jun 2022 723rd markroloff 860 76 262ms 24 Jul 2022 723rd Clebam 🇫🇷 860 76 280ms 26 Jul 2022 723rd KevinLaux 860 76 273ms 2 Nov 2022 723rd Tadas 860 76 250ms 23 Feb 2024 723rd MarkE0 860 76 266ms 30 Apr 2024 731st SirBogman 🇺🇸 860 110 134ms 4 Oct 2023 732nd Alex-x90 🇺🇸 860 112 2ms 19 May 2023 732nd JohandeRuiter 🇳🇱 860 112 2ms 27 Nov 2023 732nd Bmrl7 860 112 3ms 27 Dec 2023 732nd byronknoll 🇺🇸 860 112 2ms 21 Jan 2024 736th YPuest 859 93 6ms 15 Feb 2023 736th rus13th 859 93 5ms 4 Oct 2024 738th janAkali 🇷🇺 859 104 125ms 20 Feb 2026 739th MeWhenI 🇻🇦 858 47 50ms 28 Jul 2022 739th fuzzylojik-golf 🇺🇸 858 47 46ms 31 Aug 2025 741st Lydxn 🇨🇦 858 107 418ms 28 Apr 2022 741st Steffan153 🇫🇮 858 107 427ms 12 Feb 2023 741st feberhard 858 107 415ms 7 Apr 2023 741st sean-niemann 🇺🇸 858 107 425ms 20 Jun 2025 745th Shanethegamer 🇺🇸 858 121 468ms 13 Dec 2022 746th AlephSquirrel 857 133 4ms 2 Aug 2024 747th jared-hughes 857 139 421ms 24 Jun 2022 747th tim-trimble 857 139 64ms 4 Aug 2022 747th ZachClayburn 857 139 65ms 4 Aug 2022 747th SpacelessL 857 139 64ms 7 Apr 2024 751st snoozingnewt 🇨🇦 855 86 1,049ms 14 Oct 2025 752nd sean-niemann 🇺🇸 855 126 38ms 24 Apr 2023 753rd thadonz 854 90 10ms 1 Mar 2022 753rd Efren071 854 90 10ms 14 Apr 2022 753rd mackereldev 854 90 12ms 28 Apr 2022 753rd destofr 854 90 10ms 23 Aug 2022 753rd jorduino 854 90 11ms 30 Oct 2022 753rd Zach10za 854 90 12ms 30 Nov 2022 753rd MFazio23 854 90 11ms 30 Nov 2022 753rd lxmarinkovic 854 90 13ms 3 Mar 2023 753rd ejini6969 854 90 10ms 25 Mar 2023 753rd quirked-up 854 90 10ms 30 Aug 2023 753rd MineRPi 854 90 12ms 31 Jul 2024 753rd xShadowBlade 854 90 10ms 20 Nov 2024 753rd Jaydosu 854 90 13ms 28 Apr 2025 753rd De1p0 854 90 11ms 16 Jun 2025 753rd Charlie85270 854 90 11ms 25 Jun 2025 753rd Voltrifrodec 🇸🇰 854 90 10ms 10 Nov 2025 753rd Cube14yt 854 90 12ms 12 Nov 2025 770th olleicua 🇺🇸 853 72 38ms 13 Feb 2024 771st MeWhenI 🇻🇦 853 90 7ms 18 Feb 2025 772nd edsrzf 🇳🇿 853 127 21ms 8 Dec 2024 773rd tidalDisruptionEvent 🇨🇦 852 80 379ms 28 Mar 2023 773rd snoozingnewt 🇨🇦 852 80 525ms 14 Oct 2025 775th MeWhenI 🇻🇦 852 92 1ms 11 Nov 2022 775th stellartux 852 92 1ms 24 Dec 2023 775th alphafalfa 852 92 2ms 1 Aug 2025 778th MeWhenI 🇻🇦 852 110 121ms 15 Oct 2022 779th SirBogman 🇺🇸 851 109 1,291ms 9 Oct 2023 780th sean-niemann 🇺🇸 851 140 59ms 9 Feb 2022 780th arvidjonasson 851 140 72ms 7 Jun 2025 780th cjdyer 851 140 62ms 8 days ago 780th hazzery 851 140 61ms 8 days ago 784th Herbert00709 🇵🇱 851 152 4ms 15 Jan 2025 785th edsrzf 🇳🇿 850 88 6ms 5 Dec 2024 786th satutalo 🇫🇮 850 94 5ms 22 Nov 2022 786th roslov 850 94 5ms 4 Oct 2024 786th SamAntUA 🇺🇦 850 94 5ms 8 Oct 2024 789th GrayJoKing 🇦🇺 850 100 14ms 17 Dec 2021 789th Lydxn 🇨🇦 850 100 15ms 10 Jan 2022 791st cryptoriddlerUIO 850 108 403ms 22 Mar 2025 791st bilal2709 850 108 438ms 19 Jan 2026 793rd GrayJoKing 🇦🇺 849 77 271ms 21 Nov 2021 794th Shanethegamer 🇺🇸 848 119 2ms 25 Mar 2023 795th stefangimmillaro 847 89 1,290ms 2 Nov 2022 795th MeWhenI 🇻🇦 847 89 1,297ms 12 May 2023 795th inventshah 847 89 1,311ms 27 Sep 2023 795th Yewzir 🇧🇪 847 89 1,196ms 7 Feb 2024 795th anter69 🇭🇺 847 89 1,321ms 24 Oct 2024 800th sisyphus-ppcg 🇦🇺 846 56 2ms 13 Jan 2022 First Prev 721–800 of 3,459 Next Last