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 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 albanian-laundromat 0 53 892ms 6 Dec 2025 80th pardouin 🇫🇷 0 53 2,732ms 19 Feb 2026 80th edsrzf 🇳🇿 0 53 2,777ms 6 hours ago 84th Shanethegamer 🇺🇸 0 54 39ms 13 Dec 2024 84th error256 0 54 25ms 2 May 2025 84th albanian-laundromat 0 54 2,676ms 18 Feb 2026 84th emgordon154 0 54 33ms 30 hours ago 84th ComradeSquirrel 0 54 41ms 3 hours ago 89th error256 0 55 2,813ms 15 Feb 2026 89th MeWhenI 🇻🇦 0 55 50ms 8 hours ago 91st GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 91st kg583 🇺🇸 0 56 9ms 14 Jan 2026 91st edsrzf 🇳🇿 0 56 9ms 16 hours ago 91st helbling 🇨🇭 0 56 40ms 15 hours ago 91st CaedenHarper 🇨🇦 0 56 14ms 13 hours ago 96th edsrzf 🇳🇿 0 57 13ms 10 May 2025 97th GolfingSuccess 🇬🇷 0 59 224ms 12 Jan 2026 97th error256 0 59 68ms 13 Jan 2026 97th rucin93 🇵🇱 0 59 200ms 16 days ago 97th madex 🇩🇪 0 59 2,743ms 4 days ago 101st kg583 🇺🇸 0 60 365ms 1 Dec 2024 101st ovs-code 🇩🇪 0 60 413ms 23 Feb 2025 101st GolfingSuccess 🇬🇷 0 60 445ms 11 Jan 2026 101st Steffan153 🇫🇮 0 60 446ms 19 Feb 2026 101st sean-niemann 🇺🇸 0 60 458ms 3 days ago 101st pardouin 🇫🇷 0 60 439ms 19 hours ago 107th DialFrost 🇸🇬 0 61 25ms 24 Feb 2025 107th voytxt 🇨🇿 0 61 62ms 1 Jan 2026 107th albanian-laundromat 0 61 26ms 21 days ago 107th aksyristos 0 61 11ms 6 days ago 111th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 111th sean-niemann 🇺🇸 0 62 167ms 19 May 2025 111th XenThe 🇬🇧 0 62 11ms 15 Jul 2025 111th JOrE20 0 62 28ms 25 days ago 111th edsrzf 🇳🇿 0 62 111ms 3 hours ago 116th Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 116th sean-niemann 🇺🇸 0 63 7ms 9 May 2025 116th rucin93 🇵🇱 0 63 7ms 10 May 2025 116th edsrzf 🇳🇿 0 63 6ms 10 May 2025 116th targrik 0 63 7ms 8 Oct 2025 116th GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 122nd error256 0 64 4,375ms 15 Jan 2026 123rd GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 124th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 124th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 124th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 124th edsrzf 🇳🇿 0 66 11ms 5 hours ago 128th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 128th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 128th emgordon154 0 67 396ms 9 May 2025 128th namelessiw 0 67 407ms 2 Nov 2025 128th error256 0 67 111ms 30 Jan 2026 128th CaedenHarper 🇨🇦 0 67 553ms 3 days ago 128th fuzzylojik-golf 🇺🇸 0 67 490ms 35 hours ago 128th HumanoidCPU 0 67 577ms 12 hours ago 136th lifthrasiir 🇰🇷 0 68 559ms 11 Dec 2024 136th Shanethegamer 🇺🇸 0 68 257ms 13 Dec 2024 136th Yax42 🇫🇷 0 68 12ms 19 hours ago 139th khvdm 0 69 136ms 13 Jan 2025 139th 4atj 0 69 1,135ms 21 May 2025 139th albanian-laundromat 0 69 533ms 6 Dec 2025 139th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 139th albanian-laundromat 0 69 380ms 22 Feb 2026 139th error256 0 69 410ms 2 days ago 139th edsrzf 🇳🇿 0 69 394ms 5 hours ago 146th btnlq 0 70 193ms 4 Dec 2024 146th error256 0 70 129ms 15 Jan 2026 146th error256 0 70 18ms 11 days ago 146th Seek64 🇩🇪 0 70 114ms 20 hours ago 150th GolfingSuccess 🇬🇷 0 71 3ms 12 Jan 2026 150th GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 150th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 150th ovs-code 🇩🇪 0 71 134ms 17 hours ago 150th edsrzf 🇳🇿 0 71 18ms 10 hours ago 150th kg583 🇺🇸 0 71 18ms 8 hours ago 150th rhdqor213 0 71 4ms 4 hours ago 157th dokutan 0 72 525ms 15 Aug 2025 157th rucin93 🇵🇱 0 72 9ms 18 days ago 157th aksyristos 0 72 247ms 13 days ago 157th blaztoma 🇱🇹 0 72 123ms 22 hours ago First Prev 81–160 of 325 Next Last