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 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 80th GolfingSuccess 🇬🇷 0 51 35ms 12 Jan 2026 80th sean-niemann 🇺🇸 0 51 34ms 15 Jan 2026 80th Steffan153 🇫🇮 0 51 33ms 19 Feb 2026 80th rucin93 🇵🇱 0 51 33ms 19 days ago 80th Natanaelel 🇸🇪 0 51 34ms 47 hours ago 80th CaedenHarper 🇨🇦 0 51 882ms 38 hours ago 87th Shanethegamer 🇺🇸 0 52 1,314ms 13 Dec 2024 87th Shanethegamer 🇺🇸 0 52 181ms 7 Feb 2026 87th Lv0Sys 🇵🇱 0 52 13ms 2 hours ago 90th ovs-code 🇩🇪 0 53 125ms 30 May 2025 90th albanian-laundromat 0 53 840ms 6 Dec 2025 90th pardouin 🇫🇷 0 53 2,732ms 19 Feb 2026 90th edsrzf 🇳🇿 0 53 2,777ms 32 hours ago 94th Shanethegamer 🇺🇸 0 54 41ms 13 Dec 2024 94th error256 0 54 28ms 2 May 2025 94th albanian-laundromat 0 54 2,676ms 18 Feb 2026 94th emgordon154 0 54 41ms 2 days ago 94th ComradeSquirrel 0 54 40ms 28 hours ago 94th helbling 🇨🇭 0 54 33ms 18 hours ago 100th error256 0 55 2,813ms 15 Feb 2026 100th MeWhenI 🇻🇦 0 55 50ms 34 hours ago 102nd GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 102nd kg583 🇺🇸 0 56 9ms 14 Jan 2026 102nd edsrzf 🇳🇿 0 56 9ms 42 hours ago 102nd CaedenHarper 🇨🇦 0 56 12ms 38 hours ago 102nd MeWhenI 🇻🇦 0 56 13ms 8 hours ago 107th edsrzf 🇳🇿 0 57 14ms 10 May 2025 108th GolfingSuccess 🇬🇷 0 59 224ms 12 Jan 2026 108th error256 0 59 68ms 13 Jan 2026 108th rucin93 🇵🇱 0 59 200ms 17 days ago 108th madex 🇩🇪 0 59 2,743ms 5 days ago 112th kg583 🇺🇸 0 60 365ms 1 Dec 2024 112th ovs-code 🇩🇪 0 60 413ms 23 Feb 2025 112th GolfingSuccess 🇬🇷 0 60 445ms 11 Jan 2026 112th Steffan153 🇫🇮 0 60 446ms 19 Feb 2026 112th sean-niemann 🇺🇸 0 60 458ms 4 days ago 112th pardouin 🇫🇷 0 60 413ms 45 hours ago 118th DialFrost 🇸🇬 0 61 34ms 24 Feb 2025 118th voytxt 🇨🇿 0 61 28ms 1 Jan 2026 118th albanian-laundromat 0 61 13ms 22 days ago 118th aksyristos 0 61 13ms 8 days ago 122nd Andrey-Plotnikov 0 62 36ms 12 Jan 2025 122nd sean-niemann 🇺🇸 0 62 167ms 19 May 2025 122nd XenThe 🇬🇧 0 62 16ms 15 Jul 2025 122nd JOrE20 0 62 29ms 26 days ago 122nd edsrzf 🇳🇿 0 62 111ms 29 hours ago 127th Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 127th sean-niemann 🇺🇸 0 63 7ms 9 May 2025 127th rucin93 🇵🇱 0 63 7ms 10 May 2025 127th edsrzf 🇳🇿 0 63 6ms 10 May 2025 127th targrik 0 63 7ms 8 Oct 2025 127th GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 133rd error256 0 64 4,375ms 15 Jan 2026 134th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 135th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 135th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 135th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 135th edsrzf 🇳🇿 0 66 11ms 31 hours ago 135th Steffan153 🇫🇮 0 66 10ms 7 hours ago 135th plcc0 0 66 463ms 4 hours ago 141st Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 141st Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 141st emgordon154 0 67 396ms 9 May 2025 141st namelessiw 0 67 407ms 2 Nov 2025 141st error256 0 67 111ms 30 Jan 2026 141st CaedenHarper 🇨🇦 0 67 553ms 4 days ago 141st fuzzylojik-golf 🇺🇸 0 67 490ms 2 days ago 141st HumanoidCPU 0 67 577ms 38 hours ago 149th lifthrasiir 🇰🇷 0 68 559ms 11 Dec 2024 149th Shanethegamer 🇺🇸 0 68 257ms 13 Dec 2024 149th Yax42 🇫🇷 0 68 16ms 45 hours ago 152nd khvdm 0 69 136ms 13 Jan 2025 152nd 4atj 0 69 1,135ms 21 May 2025 152nd albanian-laundromat 0 69 533ms 6 Dec 2025 152nd GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 152nd albanian-laundromat 0 69 380ms 22 Feb 2026 152nd error256 0 69 410ms 3 days ago 152nd edsrzf 🇳🇿 0 69 394ms 30 hours ago 159th btnlq 0 70 193ms 4 Dec 2024 159th error256 0 70 129ms 15 Jan 2026 First Prev 81–160 of 356 Next Last