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?
φ in Python 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 75th LogicalJoe 930 57 10ms 6 Sep 2022 75th jakobkordez 🇸🇮 930 57 10ms 21 Nov 2022 75th fkantelberg 930 57 39ms 6 Aug 2023 75th RYNO8 930 57 75ms 22 Aug 2023 75th jacobly0 🇺🇸 930 57 10ms 1 Sep 2023 75th wuzekai518 930 57 28ms 12 Jun 2024 75th jatloe 930 57 78ms 27 Sep 2024 75th lifthrasiir 🇰🇷 930 57 11ms 3 Dec 2024 75th agreegious 930 57 84ms 16 Mar 2025 75th Mr-McChicken 930 57 33ms 4 Oct 2025 75th solisolu 930 57 16ms 18 Nov 2025 75th plcc0 930 57 23ms 13 Jan 2026 93rd cooljoseph1 914 58 9ms 6 May 2022 93rd betaveros 914 58 10ms 31 Dec 2022 93rd klixel 🇨🇦 914 58 9ms 9 Jun 2023 93rd snydej 914 58 35ms 21 Nov 2024 93rd andrewjc2000 914 58 10ms 7 Mar 2025 93rd Babafaba 914 58 12ms 4 Nov 2025 99th galloj 🇨🇿 898 59 221ms 25 Jan 2021 99th vezzick 898 59 470ms 7 Mar 2021 99th petroselo 898 59 10ms 16 Nov 2021 99th guilhem-roy 🇫🇷 898 59 10ms 22 Feb 2022 99th MichalMarsalek 🇨🇿 898 59 9ms 5 Nov 2022 99th dusmart 898 59 80ms 11 Apr 2023 99th SB-945 898 59 25ms 2 Feb 2024 99th fgrosshans 🇫🇷 898 59 77ms 15 Jul 2024 99th edsrzf 🇳🇿 898 59 9ms 2 Jan 2025 99th ImpressedByRocks 898 59 51ms 23 May 2025 99th wuduculfre 898 59 10ms 22 Jul 2025 110th geofft 883 60 10ms 13 Dec 2020 110th SniperSmiley 🇺🇸 883 60 80ms 1 Jun 2022 110th glesnick 883 60 28ms 18 Aug 2022 110th FlorianCassayre 🇫🇷 883 60 83ms 8 Nov 2022 110th inverseLorentz 🇦🇺 883 60 72ms 10 Apr 2024 115th daedals 869 61 26ms 5 Jun 2019 115th argusdusty 🇺🇸 869 61 10ms 31 Dec 2020 115th jiaminglimjm 🇲🇾 869 61 10ms 9 Jan 2021 115th commandz0 🇺🇸 869 61 10ms 6 Sep 2022 115th falsidge 869 61 9ms 20 Jun 2023 115th piano-miles 869 61 10ms 30 Dec 2023 115th mathisfun271 869 61 10ms 13 Feb 2024 122nd yokasuretsu 855 62 47ms 19 Apr 2018 122nd namelessiw 855 62 28ms 28 Feb 2024 124th jhu04 841 63 10ms 24 Sep 2022 124th Command-Master 841 63 10ms 23 Sep 2023 126th LucasBertocchini 828 64 10ms 11 Dec 2020 126th MaxElf999 828 64 9ms 15 Feb 2024 126th KasperKivimaeki 🇫🇮 828 64 73ms 16 Jul 2025 129th bwenstar 815 65 10ms 9 Aug 2022 129th nstearns96 🇬🇧 815 65 10ms 15 Sep 2023 129th GeorgeStechman 🇬🇧 815 65 47ms 6 Jan 2024 132nd petar-donchev 803 66 81ms 3 Sep 2019 132nd za3k 803 66 12ms 19 Oct 2022 132nd qpwoeirut 803 66 13ms 14 Aug 2025 135th CatsAreFluffy 779 68 11ms 19 Feb 2023 135th cros107 🇦🇺 779 68 10ms 5 Sep 2025 137th Shanethegamer 🇺🇸 768 69 10ms 27 Jun 2022 137th elgan65536 🇺🇸 768 69 72ms 18 Nov 2023 139th zbreit 🇺🇸 757 70 12ms 17 Aug 2021 139th thehylian 757 70 12ms 30 Dec 2022 139th NDR0216 🇹🇼 757 70 12ms 17 Feb 2023 139th fourth-bit 757 70 13ms 9 Jul 2023 139th cefqrn 757 70 12ms 13 Apr 2025 139th dirckvdende 757 70 13ms 27 Jul 2025 139th InigoK 🇺🇸 757 70 13ms 29 Aug 2025 139th dokutan 757 70 13ms 14 Feb 2026 147th sstadick 746 71 25ms 20 Feb 2018 147th biotinker 746 71 25ms 20 Feb 2018 147th gregadoff 746 71 24ms 20 Feb 2018 147th tcoard 746 71 24ms 20 Feb 2018 147th bkshrader 746 71 24ms 30 Dec 2018 147th GolfingSuccess 🇬🇷 746 71 24ms 27 May 2019 147th michelebastione 🇮🇹 746 71 23ms 30 Jun 2019 147th thisishowmymindworks 🇳🇴 746 71 10ms 17 Oct 2020 147th LlamaLad7 🇬🇧 746 71 24ms 17 Jan 2021 147th georgehulme 746 71 24ms 27 Jan 2022 147th LeeCamp 746 71 23ms 15 Feb 2022 147th andre-de-lorde 746 71 25ms 7 Jun 2022 147th cbondurant 746 71 12ms 6 Jul 2022 147th Bulmenisaurus 746 71 24ms 19 Jun 2024 First Prev 81–160 of 407 Next Last