The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 hours. Why not try and solve them ahead of time?
Gray Code Decoder 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 khvdm 0 69 137ms 13 Jan 2025 1st 4atj 0 69 1,062ms 21 May 2025 3rd btnlq 0 70 193ms 4 Dec 2024 3rd error256 0 70 129ms 15 Jan 2026 3rd Seek64 🇩🇪 0 70 116ms 7 days ago 6th ovs-code 🇩🇪 0 71 134ms 7 days ago 7th aksyristos 0 72 247ms 19 days ago 7th blaztoma 🇱🇹 0 72 151ms 7 days ago 7th Emutis 🇱🇹 0 72 121ms 7 days ago 7th zacjl 0 72 131ms 5 days ago 11th pardouin 🇫🇷 0 73 179ms 14 Feb 2026 11th Steffan153 🇫🇮 0 73 1,300ms 19 Feb 2026 13th lukegustafson 🇺🇸 0 74 189ms 22 days ago 14th kg583 🇺🇸 0 75 38ms 1 Dec 2024 14th hallvabo 🇳🇴 0 75 131ms 30 Dec 2024 14th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 14th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 14th GolfingSuccess 🇬🇷 0 75 19ms 11 Jan 2026 14th madex 🇩🇪 0 75 26ms 12 days ago 14th CaedenHarper 🇨🇦 0 75 149ms 9 days ago 14th fuzzylojik-golf 🇺🇸 0 75 123ms 7 days ago 14th edsrzf 🇳🇿 0 75 17ms 6 days ago 14th plcc0 0 75 21ms 6 days ago 14th zgialor-lab 0 75 25ms 6 days ago 14th ndren 0 75 19ms 5 days ago 14th CornerMercury 🇬🇧 0 75 19ms 4 days ago 14th DialFrost 🇸🇬 0 75 25ms 2 days ago 14th sean-niemann 🇺🇸 0 75 178ms 33 hours ago 29th AlephSquirrel 0 76 43ms 3 Dec 2025 29th MeWhenI 🇻🇦 0 76 586ms 15 days ago 29th duckyluuk 🇳🇱 0 76 128ms 5 days ago 32nd lifthrasiir 🇰🇷 0 77 192ms 11 Dec 2024 32nd Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 32nd emgordon154 0 77 161ms 9 May 2025 32nd addmai 0 77 20ms 24 Jul 2025 32nd hiichbindermax 0 77 17ms 17 Aug 2025 32nd 5cw 🇺🇸 0 77 18ms 22 Aug 2025 32nd davecame 0 77 135ms 25 Sep 2025 32nd SirBogman 🇺🇸 0 77 232ms 13 Oct 2025 32nd jtaxen 0 77 19ms 16 Oct 2025 32nd albanian-laundromat 0 77 19ms 25 Nov 2025 32nd anter69 🇭🇺 0 77 139ms 4 Feb 2026 32nd Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 32nd KasperKivimaeki 🇫🇮 0 77 564ms 15 days ago 32nd StefanHabel 🇨🇦 0 77 1,217ms 7 days ago 32nd ahmetdemirag 🇨🇾 0 77 18ms 7 days ago 32nd tomh1012 0 77 17ms 7 days ago 32nd HumanoidCPU 0 77 230ms 6 days ago 32nd qpwoeirut 0 77 19ms 6 days ago 32nd btjones0 0 77 19ms 6 days ago 32nd ComradeSquirrel 0 77 18ms 6 days ago 32nd bzijlema 🇳🇱 0 77 19ms 6 days ago 32nd Lv0Sys 🇵🇱 0 77 18ms 5 days ago 32nd stefangimmillaro 0 77 136ms 2 days ago 32nd LostSyntax21 🇬🇧 0 77 18ms 2 days ago 56th jameswmccarty 0 78 19ms 29 Mar 2025 56th solisolu 0 78 20ms 10 Nov 2025 58th BREMAUCY 🇫🇷 0 79 18ms 7 days ago 58th Andrey2001 0 79 18ms 7 days ago 58th mishak-sys 0 79 411ms 5 days ago 58th firegene 🇮🇪 0 79 18ms 4 hours ago 62nd Aquateraneal 🇺🇸 0 81 19ms 4 days ago 62nd luuumine 🇫🇷 0 81 16ms 4 days ago 64th bricknellj 0 82 17ms 30 Jan 2025 64th dokutan 0 82 17ms 15 Aug 2025 64th scpchicken 🇵🇼 0 82 402ms 7 days ago 64th KatieLG 🇬🇧 0 82 18ms 7 days ago 68th msbranicky 0 83 18ms 4 days ago 69th JOrE20 0 100 42ms 15 Dec 2025 70th retrohun 0 111 41ms 7 days ago 71st AstroOrbis 0 126 23ms 12 Aug 2025 1–71 of 71