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 chars. 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 Chars Time Submitted 1st khvdm 0 60 144ms 13 Jan 2025 1st Seek64 🇩🇪 0 60 125ms 16 hours ago 3rd pardouin 🇫🇷 0 62 192ms 14 Feb 2026 3rd Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 5th kg583 🇺🇸 0 63 904ms 1 Dec 2024 5th hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 5th fuzzylojik-golf 🇺🇸 0 63 142ms 32 hours ago 8th CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 8th ndren 0 64 18ms 3 Dec 2024 8th lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 8th emgordon154 0 64 19ms 9 May 2025 8th anter69 🇭🇺 0 64 19ms 4 Feb 2026 8th albanian-laundromat 0 64 18ms 22 Feb 2026 8th HumanoidCPU 0 64 256ms 8 hours ago 15th dokutan 0 66 19ms 18 Aug 2025 16th 4atj 0 69 1,159ms 21 May 2025 17th btnlq 0 70 193ms 4 Dec 2024 17th error256 0 70 133ms 15 Jan 2026 19th ovs-code 🇩🇪 0 71 134ms 14 hours ago 20th aksyristos 0 72 247ms 13 days ago 20th blaztoma 🇱🇹 0 72 123ms 18 hours ago 20th Emutis 🇱🇹 0 72 121ms 17 hours ago 23rd lukegustafson 🇺🇸 0 74 189ms 16 days ago 24th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 24th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 24th GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 24th madex 🇩🇪 0 75 18ms 6 days ago 24th CaedenHarper 🇨🇦 0 75 149ms 3 days ago 29th AlephSquirrel 0 76 43ms 3 Dec 2025 29th MeWhenI 🇻🇦 0 76 586ms 9 days ago 31st Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 31st DialFrost 🇸🇬 0 77 19ms 8 May 2025 31st edsrzf 🇳🇿 0 77 1,938ms 9 May 2025 31st addmai 0 77 20ms 24 Jul 2025 31st hiichbindermax 0 77 19ms 17 Aug 2025 31st 5cw 🇺🇸 0 77 18ms 22 Aug 2025 31st davecame 0 77 150ms 25 Sep 2025 31st SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 31st jtaxen 0 77 19ms 16 Oct 2025 31st Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 31st KasperKivimaeki 🇫🇮 0 77 564ms 9 days ago 31st StefanHabel 🇨🇦 0 77 1,207ms 26 hours ago 31st ahmetdemirag 🇨🇾 0 77 18ms 21 hours ago 31st tomh1012 0 77 17ms 19 hours ago 31st qpwoeirut 0 77 20ms 4 hours ago 31st btjones0 0 77 19ms 2 hours ago 31st ComradeSquirrel 0 77 18ms 34 mins ago 48th jameswmccarty 0 78 20ms 29 Mar 2025 48th solisolu 0 78 20ms 10 Nov 2025 50th BREMAUCY 🇫🇷 0 79 18ms 23 hours ago 50th Andrey2001 0 79 18ms 16 hours ago 52nd stefangimmillaro 0 80 19ms 3 hours ago 53rd bricknellj 0 82 17ms 30 Jan 2025 53rd scpchicken 🇵🇼 0 82 402ms 33 hours ago 53rd KatieLG 🇬🇧 0 82 18ms 33 hours ago 56th JOrE20 0 100 42ms 15 Dec 2025 57th retrohun 0 111 41ms 18 hours ago 58th AstroOrbis 0 126 23ms 12 Aug 2025 1–58 of 58