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?
Set 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 1st pardouin 🇫🇷 1,000 118 29ms 28 Mar 2025 1st Seek64 🇩🇪 1,000 118 28ms 30 Mar 2025 1st khvdm 1,000 118 29ms 31 Mar 2025 1st JayXon 🇺🇸 1,000 118 29ms 31 Mar 2025 1st 4atj 1,000 118 28ms 4 Apr 2025 1st error256 1,000 118 33ms 27 Apr 2025 1st orthoplex 🇨🇽 1,000 118 28ms 3 Jun 2025 1st ovs-code 🇩🇪 1,000 118 30ms 17 Nov 2025 1st sunleonid 1,000 118 29ms 3 Jan 2026 10th zacjl 967 122 126ms 29 Mar 2025 11th kg583 🇺🇸 959 123 28ms 4 Jan 2025 11th GolfingSuccess 🇬🇷 959 123 27ms 9 Jan 2025 11th AlephSquirrel 959 123 85ms 16 Jan 2025 11th hallvabo 🇳🇴 959 123 27ms 26 Mar 2025 11th emgordon154 959 123 26ms 26 Mar 2025 11th Natanaelel 🇸🇪 959 123 27ms 31 Mar 2025 11th lynn 959 123 27ms 7 Apr 2025 11th Mukundan314 959 123 28ms 12 Apr 2025 11th BlankSpruce 959 123 28ms 13 Apr 2025 11th m-tkach 🇺🇦 959 123 29ms 14 Apr 2025 11th Bulmenisaurus 959 123 28ms 30 Jun 2025 11th SirBogman 🇺🇸 959 123 28ms 1 Jul 2025 11th duckyluuk 🇳🇱 959 123 25ms 6 Jul 2025 11th KatieLG 🇬🇧 959 123 27ms 22 Sep 2025 11th edsrzf 🇳🇿 959 123 27ms 27 Sep 2025 11th Babafaba 959 123 27ms 26 Oct 2025 11th bzijlema 🇳🇱 959 123 27ms 28 Nov 2025 11th ryyyn 🇺🇸 959 123 27ms 7 Feb 2026 11th Steffan153 🇫🇮 959 123 26ms 11 Feb 2026 30th btnlq 952 124 26ms 6 Jan 2025 30th inventshah 952 124 32ms 31 Mar 2025 30th albanian-laundromat 952 124 28ms 15 Oct 2025 30th sean-niemann 🇺🇸 952 124 26ms 4 Dec 2025 30th Lv0Sys 🇵🇱 952 124 26ms 10 Dec 2025 30th blaztoma 🇱🇹 952 124 27ms 17 Jan 2026 36th davecame 944 125 23ms 12 Apr 2025 37th Shanethegamer 🇺🇸 937 126 26ms 13 Feb 2025 37th plcc0 937 126 27ms 26 Mar 2025 37th annaproxy 937 126 27ms 7 Apr 2025 37th BREMAUCY 🇫🇷 937 126 27ms 16 Apr 2025 37th FEZfan 🇦🇺 937 126 27ms 17 Apr 2025 37th ndren 937 126 27ms 28 May 2025 37th CornerMercury 🇬🇧 937 126 27ms 28 May 2025 37th 5cw 🇺🇸 937 126 27ms 30 May 2025 37th qpwoeirut 937 126 27ms 4 Sep 2025 37th luuumine 🇫🇷 937 126 26ms 26 Oct 2025 37th snoozingnewt 🇨🇦 937 126 27ms 20 Nov 2025 37th 051 🇸🇬 937 126 27ms 16 Feb 2026 49th DialFrost 🇸🇬 929 127 31ms 18 Feb 2025 49th bizy-coder 929 127 33ms 18 Feb 2025 49th bricknellj 929 127 27ms 28 Mar 2025 49th cros107 🇦🇺 929 127 27ms 30 Mar 2025 49th anter69 🇭🇺 929 127 25ms 31 Mar 2025 49th souta-1326 929 127 29ms 1 Apr 2025 49th bknower 929 127 28ms 29 Jun 2025 56th scpchicken 🇵🇼 922 128 27ms 13 Apr 2025 56th stefangimmillaro 922 128 99ms 28 Apr 2025 56th MeWhenI 🇻🇦 922 128 28ms 13 Jul 2025 56th solisolu 922 128 27ms 4 Dec 2025 60th neihousaigaai 915 129 19ms 5 Apr 2025 60th ahmetdemirag 🇨🇾 915 129 27ms 5 Apr 2025 62nd GrayJoKing 🇦🇺 908 130 41ms 1 Apr 2025 62nd rollershutter 908 130 27ms 8 Apr 2025 62nd InigoK 🇺🇸 908 130 27ms 19 Sep 2025 62nd StefanHabel 🇨🇦 908 130 26ms 6 hours ago 66th commandz0 🇺🇸 901 131 30ms 28 Mar 2025 67th SB-945 894 132 28ms 1 Apr 2025 67th OllieBoyne 🇬🇧 894 132 27ms 3 Apr 2025 69th mousetail 🇳🇱 887 133 20ms 3 Apr 2025 69th jatloe 887 133 25ms 29 Jun 2025 69th jtaxen 887 133 27ms 20 Oct 2025 72nd ImpressedByRocks 881 134 27ms 29 Apr 2025 72nd JOrE20 881 134 25ms 26 days ago 74th madex 🇩🇪 874 135 27ms 13 Feb 2025 74th KasperKivimaeki 🇫🇮 874 135 29ms 3 Jul 2025 74th amberzit 874 135 25ms 6 Jul 2025 74th JunkIce 874 135 22ms 9 Jul 2025 74th Flekay 🇩🇪 874 135 25ms 19 Feb 2026 79th hiichbindermax 843 140 20ms 22 May 2025 79th Artemis21 🇬🇧 843 140 31ms 23 May 2025 1–80 of 124 Next Last
