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 78th Steffan153 🇫🇮 0 51 33ms 19 Feb 2026 78th rucin93 🇵🇱 0 51 33ms 18 days ago 78th Natanaelel 🇸🇪 0 51 34ms 35 hours ago 78th CaedenHarper 🇨🇦 0 51 882ms 26 hours ago 85th Shanethegamer 🇺🇸 0 52 1,314ms 13 Dec 2024 85th Shanethegamer 🇺🇸 0 52 181ms 7 Feb 2026 87th ovs-code 🇩🇪 0 53 125ms 30 May 2025 87th albanian-laundromat 0 53 892ms 6 Dec 2025 87th pardouin 🇫🇷 0 53 2,732ms 19 Feb 2026 87th edsrzf 🇳🇿 0 53 2,777ms 19 hours ago 91st Shanethegamer 🇺🇸 0 54 41ms 13 Dec 2024 91st error256 0 54 28ms 2 May 2025 91st albanian-laundromat 0 54 2,676ms 18 Feb 2026 91st emgordon154 0 54 41ms 43 hours ago 91st ComradeSquirrel 0 54 40ms 16 hours ago 91st helbling 🇨🇭 0 54 33ms 5 hours ago 97th error256 0 55 2,813ms 15 Feb 2026 97th MeWhenI 🇻🇦 0 55 50ms 22 hours ago 99th GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 99th kg583 🇺🇸 0 56 9ms 14 Jan 2026 99th edsrzf 🇳🇿 0 56 9ms 30 hours ago 99th CaedenHarper 🇨🇦 0 56 12ms 26 hours ago 103rd edsrzf 🇳🇿 0 57 14ms 10 May 2025 104th GolfingSuccess 🇬🇷 0 59 224ms 12 Jan 2026 104th error256 0 59 68ms 13 Jan 2026 104th rucin93 🇵🇱 0 59 200ms 16 days ago 104th madex 🇩🇪 0 59 2,743ms 4 days ago 108th kg583 🇺🇸 0 60 365ms 1 Dec 2024 108th ovs-code 🇩🇪 0 60 413ms 23 Feb 2025 108th GolfingSuccess 🇬🇷 0 60 445ms 11 Jan 2026 108th Steffan153 🇫🇮 0 60 446ms 19 Feb 2026 108th sean-niemann 🇺🇸 0 60 458ms 3 days ago 108th pardouin 🇫🇷 0 60 413ms 33 hours ago 114th DialFrost 🇸🇬 0 61 34ms 24 Feb 2025 114th voytxt 🇨🇿 0 61 28ms 1 Jan 2026 114th albanian-laundromat 0 61 13ms 21 days ago 114th aksyristos 0 61 13ms 7 days ago 118th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 118th sean-niemann 🇺🇸 0 62 167ms 19 May 2025 118th XenThe 🇬🇧 0 62 16ms 15 Jul 2025 118th JOrE20 0 62 29ms 26 days ago 118th edsrzf 🇳🇿 0 62 111ms 16 hours ago 123rd Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 123rd sean-niemann 🇺🇸 0 63 7ms 9 May 2025 123rd rucin93 🇵🇱 0 63 7ms 10 May 2025 123rd edsrzf 🇳🇿 0 63 6ms 10 May 2025 123rd targrik 0 63 7ms 8 Oct 2025 123rd GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 129th error256 0 64 4,375ms 15 Jan 2026 130th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 131st Yax42 🇫🇷 0 66 470ms 6 Jan 2026 131st AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 131st GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 131st edsrzf 🇳🇿 0 66 11ms 19 hours ago 135th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 135th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 135th emgordon154 0 67 396ms 9 May 2025 135th namelessiw 0 67 407ms 2 Nov 2025 135th error256 0 67 111ms 30 Jan 2026 135th CaedenHarper 🇨🇦 0 67 553ms 4 days ago 135th fuzzylojik-golf 🇺🇸 0 67 490ms 2 days ago 135th HumanoidCPU 0 67 577ms 26 hours ago 143rd lifthrasiir 🇰🇷 0 68 559ms 11 Dec 2024 143rd Shanethegamer 🇺🇸 0 68 257ms 13 Dec 2024 143rd Yax42 🇫🇷 0 68 16ms 33 hours ago 146th khvdm 0 69 136ms 13 Jan 2025 146th 4atj 0 69 1,135ms 21 May 2025 146th albanian-laundromat 0 69 533ms 6 Dec 2025 146th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 146th albanian-laundromat 0 69 380ms 22 Feb 2026 146th error256 0 69 410ms 3 days ago 146th edsrzf 🇳🇿 0 69 394ms 18 hours ago 153rd btnlq 0 70 193ms 4 Dec 2024 153rd error256 0 70 129ms 15 Jan 2026 153rd error256 0 70 18ms 12 days ago 153rd Seek64 🇩🇪 0 70 114ms 33 hours ago 157th GolfingSuccess 🇬🇷 0 71 3ms 12 Jan 2026 157th GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 157th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 157th ovs-code 🇩🇪 0 71 134ms 31 hours ago First Prev 81–160 of 340 Next Last