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?
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 136ms 13 Jan 2025 1st 4atj 0 69 1,135ms 21 May 2025 3rd btnlq 0 70 193ms 4 Dec 2024 3rd error256 0 70 129ms 15 Jan 2026 3rd Seek64 🇩🇪 0 70 114ms 21 hours ago 6th ovs-code 🇩🇪 0 71 134ms 19 hours ago 7th aksyristos 0 72 247ms 13 days ago 7th blaztoma 🇱🇹 0 72 123ms 23 hours ago 7th Emutis 🇱🇹 0 72 121ms 22 hours ago 10th pardouin 🇫🇷 0 73 179ms 14 Feb 2026 10th Steffan153 🇫🇮 0 73 1,278ms 19 Feb 2026 12th lukegustafson 🇺🇸 0 74 189ms 16 days ago 13th kg583 🇺🇸 0 75 38ms 1 Dec 2024 13th hallvabo 🇳🇴 0 75 131ms 30 Dec 2024 13th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 13th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 13th GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 13th madex 🇩🇪 0 75 18ms 6 days ago 13th CaedenHarper 🇨🇦 0 75 149ms 3 days ago 13th fuzzylojik-golf 🇺🇸 0 75 123ms 38 hours ago 13th edsrzf 🇳🇿 0 75 17ms 4 hours ago 22nd AlephSquirrel 0 76 43ms 3 Dec 2025 22nd MeWhenI 🇻🇦 0 76 586ms 9 days ago 24th CornerMercury 🇬🇧 0 77 18ms 3 Dec 2024 24th ndren 0 77 20ms 3 Dec 2024 24th lifthrasiir 🇰🇷 0 77 192ms 11 Dec 2024 24th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 24th DialFrost 🇸🇬 0 77 19ms 8 May 2025 24th emgordon154 0 77 161ms 9 May 2025 24th addmai 0 77 20ms 24 Jul 2025 24th hiichbindermax 0 77 19ms 17 Aug 2025 24th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 24th davecame 0 77 150ms 25 Sep 2025 24th SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 24th jtaxen 0 77 19ms 16 Oct 2025 24th albanian-laundromat 0 77 19ms 25 Nov 2025 24th anter69 🇭🇺 0 77 139ms 4 Feb 2026 24th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 24th KasperKivimaeki 🇫🇮 0 77 564ms 9 days ago 24th StefanHabel 🇨🇦 0 77 1,207ms 32 hours ago 24th ahmetdemirag 🇨🇾 0 77 18ms 26 hours ago 24th tomh1012 0 77 17ms 25 hours ago 24th HumanoidCPU 0 77 230ms 14 hours ago 24th qpwoeirut 0 77 20ms 10 hours ago 24th btjones0 0 77 19ms 7 hours ago 24th ComradeSquirrel 0 77 18ms 5 hours ago 24th bzijlema 🇳🇱 0 77 18ms 4 hours ago 48th jameswmccarty 0 78 20ms 29 Mar 2025 48th solisolu 0 78 20ms 10 Nov 2025 50th BREMAUCY 🇫🇷 0 79 18ms 28 hours ago 50th Andrey2001 0 79 18ms 22 hours ago 52nd stefangimmillaro 0 80 19ms 9 hours ago 53rd bricknellj 0 82 17ms 30 Jan 2025 53rd dokutan 0 82 17ms 15 Aug 2025 53rd scpchicken 🇵🇼 0 82 402ms 38 hours ago 53rd KatieLG 🇬🇧 0 82 18ms 38 hours ago 57th JOrE20 0 100 42ms 15 Dec 2025 58th retrohun 0 111 41ms 23 hours ago 59th AstroOrbis 0 126 23ms 12 Aug 2025 1–59 of 59