The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Gray Code Decoder in all languages 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 darrenks 🇺🇸 0 6 48ms 2 days ago 1st 2bular 0 6 45ms 2 days ago 1st Natanaelel 🇸🇪 0 6 48ms 2 days ago 1st plcc0 0 6 47ms 31 hours ago 5th kg583 🇺🇸 0 9 921ms 14 May 2025 6th 2bular 0 13 4ms 9 Dec 2024 6th ovs-code 🇩🇪 0 13 4ms 5 Jan 2025 6th Natanaelel 🇸🇪 0 13 4ms 8 May 2025 6th SirBogman 🇺🇸 0 13 4ms 12 Oct 2025 6th namelessiw 0 13 335ms 25 Oct 2025 6th GolfingSuccess 🇬🇷 0 13 4ms 12 Jan 2026 6th zacjl 0 13 5ms 18 hours ago 6th Steffan153 🇫🇮 0 13 4ms 8 hours ago 14th emgordon154 0 17 9ms 2 days ago 15th saito-ta 🇯🇵 0 18 78ms 11 May 2025 15th GolfingSuccess 🇬🇷 0 18 85ms 12 Jan 2026 15th pardouin 🇫🇷 0 18 80ms 18 Feb 2026 15th MeWhenI 🇻🇦 0 18 79ms 24 hours ago 19th albanian-laundromat 0 19 4ms 13 Feb 2026 19th plcc0 0 19 86ms 31 hours ago 19th plcc0 0 19 9ms 31 hours ago 22nd AlephSquirrel 0 20 9ms 3 Dec 2025 22nd ovs-code 🇩🇪 0 20 9ms 3 Dec 2025 24th emgordon154 0 21 394ms 47 hours ago 25th CaedenHarper 🇨🇦 0 22 94ms 5 hours ago 26th albanian-laundromat 0 26 26ms 12 Feb 2026 27th AlephSquirrel 0 27 5ms 3 Dec 2025 27th ovs-code 🇩🇪 0 27 6ms 7 Dec 2025 27th GolfingSuccess 🇬🇷 0 27 27ms 26 Jan 2026 30th 2bular 0 28 36ms 9 Oct 2025 30th SirBogman 🇺🇸 0 28 37ms 9 Oct 2025 32nd Natanaelel 🇸🇪 0 29 35ms 11 May 2025 32nd ovs-code 🇩🇪 0 29 35ms 9 Oct 2025 32nd ovs-code 🇩🇪 0 29 125ms 3 Dec 2025 32nd Natanaelel 🇸🇪 0 29 121ms 2 days ago 32nd Steffan153 🇫🇮 0 29 118ms 8 hours ago 37th error256 0 30 26ms 12 Jan 2026 38th Shanethegamer 🇺🇸 0 32 36ms 19 May 2025 39th MeWhenI 🇻🇦 0 33 28ms 24 hours ago 40th 4atj 0 35 375ms 21 May 2025 40th error256 0 35 60ms 12 Jan 2026 42nd 4atj 0 36 235ms 21 May 2025 42nd saito-ta 🇯🇵 0 36 20ms 2 days ago 44th Natanaelel 🇸🇪 0 37 9ms 11 May 2025 45th Natanaelel 🇸🇪 0 38 41ms 8 May 2025 45th ovs-code 🇩🇪 0 38 38ms 13 Jan 2026 45th Steffan153 🇫🇮 0 38 79ms 19 Feb 2026 45th pardouin 🇫🇷 0 38 37ms 19 Feb 2026 49th Steffan153 🇫🇮 0 39 513ms 42 hours ago 50th stefangimmillaro 0 41 73ms 9 May 2025 50th aksyristos 0 41 104ms 8 days ago 50th MeWhenI 🇻🇦 0 41 42ms 27 hours ago 53rd Shanethegamer 🇺🇸 0 42 41ms 13 Dec 2024 53rd saito-ta 🇯🇵 0 42 386ms 10 May 2025 53rd anter69 🇭🇺 0 42 193ms 4 Feb 2026 53rd madex 🇩🇪 0 42 38ms 11 mins ago 57th bitsandbeyond 🇳🇱 0 43 3,231ms 7 days ago 57th Lv0Sys 🇵🇱 0 43 38ms 8 hours ago 57th madex 🇩🇪 0 43 8ms 7 mins ago 60th error256 0 44 1,261ms 15 Jan 2026 60th emgordon154 0 44 41ms 2 days ago 62nd pardouin 🇫🇷 0 45 1,189ms 15 Feb 2026 62nd Andriamanitra 🇫🇮 0 45 37ms 2 days ago 62nd stefangimmillaro 0 45 1,228ms 44 hours ago 65th Steffan153 🇫🇮 0 46 4,793ms 19 Feb 2026 65th Matter1024 🇮🇳 0 46 38ms 2 days ago 65th Solathian 0 46 68ms 8 hours ago 68th albanian-laundromat 0 47 1,193ms 5 Jan 2026 68th kg583 🇺🇸 0 47 11ms 14 Jan 2026 68th anter69 🇭🇺 0 47 1,232ms 4 Feb 2026 71st ovs-code 🇩🇪 0 48 316ms 23 Feb 2025 71st DialFrost 🇸🇬 0 48 55ms 16 Dec 2025 71st antimon2 🇯🇵 0 48 264ms 2 days ago 71st edsrzf 🇳🇿 0 48 888ms 40 hours ago 75th GolfingSuccess 🇬🇷 0 49 38ms 12 Jan 2026 75th error256 0 49 312ms 13 Jan 2026 75th albanian-laundromat 0 49 33ms 17 days ago 75th MeWhenI 🇻🇦 0 49 33ms 35 hours ago 75th GolfingSuccess 🇬🇷 0 49 853ms 21 hours ago 80th Shanethegamer 🇺🇸 0 50 4,029ms 8 May 2025 1–80 of 367 Next Last