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?
Evil Numbers in C++ in bytes. 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 Bytes Time Submitted 1st Lydxn 🇨🇦 1,000 70 59ms 14 Apr 2022 2nd JayXon 🇺🇸 986 71 59ms 1 Jan 2022 2nd Steffan153 🇫🇮 986 71 71ms 2 Aug 2024 2nd rucin93 🇵🇱 986 71 66ms 3 Aug 2024 2nd sean-niemann 🇺🇸 986 71 53ms 6 Aug 2024 2nd KasperKivimaeki 🇫🇮 986 71 64ms 25 Aug 2025 7th nwellnhof 🇩🇪 972 72 61ms 3 Jan 2022 7th primo-ppcg 🇹🇭 972 72 59ms 18 Jan 2022 7th Shanethegamer 🇺🇸 972 72 60ms 3 Apr 2023 7th DialFrost 🇸🇬 972 72 57ms 16 Jan 2024 7th ovs-code 🇩🇪 972 72 65ms 8 Jun 2024 7th Herbert00709 🇵🇱 972 72 67ms 12 Jul 2024 7th MostParsingVex 972 72 54ms 26 Aug 2024 7th fuzzylojik-golf 🇺🇸 972 72 55ms 20 Aug 2025 7th 09cf 972 72 58ms 25 Nov 2025 16th prplz 🇦🇺 959 73 86ms 1 Jan 2022 16th Irratix 🇳🇱 959 73 73ms 3 Jan 2022 16th inventshah 959 73 62ms 18 Jan 2022 16th MeWhenI 🇻🇦 959 73 56ms 8 May 2022 16th solmyr2000 959 73 70ms 20 Jun 2022 16th m-tkach 🇺🇦 959 73 58ms 26 Jun 2022 16th michael-pruglo 🇺🇦 959 73 64ms 13 Jul 2022 16th Alex-x90 🇺🇸 959 73 59ms 30 Jul 2022 16th jared-hughes 959 73 59ms 8 Sep 2022 16th janbehrens 🇩🇪 959 73 54ms 20 Nov 2022 16th Yewzir 🇧🇪 959 73 63ms 14 Oct 2023 16th Betuaredead 959 73 57ms 12 Nov 2023 16th Mandrzejy 🇵🇱 959 73 54ms 14 Apr 2024 16th pardouin 🇫🇷 959 73 60ms 23 Aug 2024 16th CaedenHarper 🇨🇦 959 73 62ms 8 days ago 31st ZakkkkAttackkkk 🇵🇭 946 74 66ms 27 Jul 2022 31st emgordon154 946 74 56ms 7 Feb 2026 31st damagegithub 946 74 58ms 26 days ago 34th snyderek 🇺🇸 933 75 60ms 30 Oct 2024 35th Vinterion 921 76 64ms 29 Oct 2023 35th roupiq 🇵🇱 921 76 67ms 15 Nov 2023 35th luuumine 🇫🇷 921 76 66ms 8 Nov 2025 35th dokutan 921 76 62ms 23 Feb 2026 39th annaproxy 897 78 60ms 3 Jan 2023 40th astdefu 886 79 57ms 9 Dec 2022 40th syntax-rules 886 79 67ms 15 May 2023 42nd timhaj 🇸🇮 875 80 54ms 3 Aug 2024 43rd oceko 864 81 57ms 19 Feb 2024 43rd gjoacorp 🇬🇧 864 81 59ms 4 Aug 2025 45th snoozingnewt 🇨🇦 843 83 429ms 6 Oct 2025 46th connorslade 833 84 57ms 13 May 2022 46th namcartoon06 833 84 61ms 30 Jun 2023 46th keelimeguy 🇺🇸 833 84 60ms 19 Oct 2023 46th tailorspy 833 84 79ms 23 May 2024 46th Andrey2001 833 84 62ms 27 Nov 2025 51st retrohun 824 85 64ms 3 Jan 2022 51st CatsAreFluffy 824 85 57ms 19 Feb 2023 51st bac0id 824 85 54ms 23 Feb 2024 51st abrcdabr 824 85 58ms 7 Jan 2026 55th ritwinnarra 814 86 64ms 11 Jun 2023 55th 4QT0R 814 86 63ms 23 Nov 2023 55th LHLaurini 🇧🇷 814 86 59ms 30 Jul 2024 58th ognen98 795 88 451ms 14 Jun 2023 58th CosmicRaichu 795 88 57ms 3 Feb 2026 60th I-Love-47 🇺🇦 787 89 71ms 11 Feb 2022 60th msbranicky 787 89 56ms 15 Sep 2023 62nd SurmanPP 778 90 59ms 19 Oct 2025 63rd erics118 769 91 74ms 13 May 2022 64th tvcv901 761 92 64ms 21 Mar 2023 65th m93mark 753 93 61ms 2 Jan 2022 65th tte0 753 93 1,366ms 9 Aug 2024 67th samuel-thesing 🇩🇪 745 94 1,300ms 7 Jan 2026 68th dpethes 737 95 67ms 9 Jan 2024 68th northsuperman 737 95 77ms 21 Mar 2024 68th 199Mosidze 737 95 60ms 15 Nov 2025 71st cmayer777 729 96 61ms 11 Oct 2022 71st erikji 729 96 431ms 3 Feb 2025 73rd alonmaayan 722 97 63ms 28 Mar 2023 73rd Dpxx 722 97 60ms 2 Aug 2024 73rd pradyung 722 97 1,428ms 6 Feb 2025 76th PaulMWeiser 714 98 1,430ms 28 Feb 2023 77th 1231234md5 🇨🇳 707 99 2,874ms 7 Dec 2023 77th aspiringLich 707 99 1,403ms 13 Sep 2025 79th Walter225 700 100 76ms 19 Jul 2023 80th pkhrag 693 101 72ms 4 Jan 2022 1–80 of 127 Next Last