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 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 81st Shanethegamer 🇺🇸 0 52 1,314ms 13 Dec 2024 82nd albanian-laundromat 0 53 892ms 6 Dec 2025 82nd pardouin 🇫🇷 0 53 2,732ms 19 Feb 2026 82nd edsrzf 🇳🇿 0 53 2,777ms 11 hours ago 85th Shanethegamer 🇺🇸 0 54 41ms 13 Dec 2024 85th error256 0 54 28ms 2 May 2025 85th albanian-laundromat 0 54 2,676ms 18 Feb 2026 85th emgordon154 0 54 41ms 35 hours ago 85th MeWhenI 🇻🇦 0 54 50ms 13 hours ago 85th ComradeSquirrel 0 54 40ms 8 hours ago 91st error256 0 55 2,813ms 15 Feb 2026 92nd kg583 🇺🇸 0 56 562ms 1 Dec 2024 92nd GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 92nd kg583 🇺🇸 0 56 9ms 14 Jan 2026 92nd GolfingSuccess 🇬🇷 0 56 488ms 22 Jan 2026 92nd Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 92nd edsrzf 🇳🇿 0 56 9ms 22 hours ago 92nd helbling 🇨🇭 0 56 39ms 21 hours ago 92nd CaedenHarper 🇨🇦 0 56 12ms 18 hours ago 100th edsrzf 🇳🇿 0 57 14ms 10 May 2025 100th pardouin 🇫🇷 0 57 572ms 14 Feb 2026 100th GolfingSuccess 🇬🇷 0 57 213ms 16 days ago 100th rucin93 🇵🇱 0 57 211ms 16 days ago 104th sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 105th lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 105th ovs-code 🇩🇪 0 59 413ms 23 Feb 2025 105th error256 0 59 68ms 13 Jan 2026 105th madex 🇩🇪 0 59 2,743ms 4 days ago 109th khvdm 0 60 144ms 13 Jan 2025 109th emgordon154 0 60 379ms 9 May 2025 109th albanian-laundromat 0 60 369ms 22 Feb 2026 109th sean-niemann 🇺🇸 0 60 458ms 3 days ago 109th Seek64 🇩🇪 0 60 125ms 25 hours ago 109th HumanoidCPU 0 60 562ms 17 hours ago 115th DialFrost 🇸🇬 0 61 34ms 24 Feb 2025 115th voytxt 🇨🇿 0 61 28ms 1 Jan 2026 115th albanian-laundromat 0 61 13ms 21 days ago 115th aksyristos 0 61 13ms 7 days ago 119th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 119th XenThe 🇬🇧 0 62 16ms 15 Jul 2025 119th pardouin 🇫🇷 0 62 192ms 14 Feb 2026 119th Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 119th JOrE20 0 62 29ms 26 days ago 119th edsrzf 🇳🇿 0 62 111ms 8 hours ago 125th kg583 🇺🇸 0 63 904ms 1 Dec 2024 125th hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 125th Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 125th sean-niemann 🇺🇸 0 63 7ms 9 May 2025 125th rucin93 🇵🇱 0 63 7ms 10 May 2025 125th edsrzf 🇳🇿 0 63 6ms 10 May 2025 125th targrik 0 63 7ms 8 Oct 2025 125th GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 125th fuzzylojik-golf 🇺🇸 0 63 142ms 41 hours ago 125th plcc0 0 63 20ms 2 hours ago 135th CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 135th ndren 0 64 18ms 3 Dec 2024 135th lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 135th emgordon154 0 64 19ms 9 May 2025 135th error256 0 64 4,375ms 15 Jan 2026 135th anter69 🇭🇺 0 64 19ms 4 Feb 2026 135th albanian-laundromat 0 64 18ms 22 Feb 2026 135th albanian-laundromat 0 64 547ms 23 Feb 2026 135th HumanoidCPU 0 64 256ms 17 hours ago 144th Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 144th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 144th dokutan 0 65 359ms 14 Feb 2026 147th dokutan 0 66 19ms 18 Aug 2025 147th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 147th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 147th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 147th edsrzf 🇳🇿 0 66 11ms 11 hours ago 152nd Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 152nd Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 152nd namelessiw 0 67 407ms 2 Nov 2025 152nd error256 0 67 111ms 30 Jan 2026 152nd CaedenHarper 🇨🇦 0 67 553ms 3 days ago 152nd fuzzylojik-golf 🇺🇸 0 67 490ms 41 hours ago 158th Yax42 🇫🇷 0 68 16ms 24 hours ago 159th 4atj 0 69 1,159ms 21 May 2025 159th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 First Prev 81–160 of 330 Next Last