The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 78th GolfingSuccess 🇬🇷 0 56 488ms 22 Jan 2026 78th Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 83rd edsrzf 🇳🇿 0 57 13ms 10 May 2025 83rd pardouin 🇫🇷 0 57 572ms 14 Feb 2026 83rd GolfingSuccess 🇬🇷 0 57 213ms 15 days ago 83rd rucin93 🇵🇱 0 57 211ms 15 days ago 87th sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 88th lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 88th ovs-code 🇩🇪 0 59 502ms 23 Feb 2025 88th error256 0 59 68ms 13 Jan 2026 88th madex 🇩🇪 0 59 2,743ms 3 days ago 92nd khvdm 0 60 144ms 13 Jan 2025 92nd emgordon154 0 60 379ms 9 May 2025 92nd albanian-laundromat 0 60 369ms 22 Feb 2026 92nd sean-niemann 🇺🇸 0 60 458ms 2 days ago 92nd Seek64 🇩🇪 0 60 125ms 71 mins ago 97th DialFrost 🇸🇬 0 61 25ms 24 Feb 2025 97th voytxt 🇨🇿 0 61 62ms 1 Jan 2026 97th albanian-laundromat 0 61 26ms 20 days ago 97th aksyristos 0 61 11ms 6 days ago 101st Andrey-Plotnikov 0 62 36ms 12 Jan 2025 101st XenThe 🇬🇧 0 62 11ms 15 Jul 2025 101st pardouin 🇫🇷 0 62 192ms 14 Feb 2026 101st Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 101st JOrE20 0 62 28ms 25 days ago 106th kg583 🇺🇸 0 63 904ms 1 Dec 2024 106th hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 106th Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 106th sean-niemann 🇺🇸 0 63 7ms 9 May 2025 106th rucin93 🇵🇱 0 63 7ms 10 May 2025 106th edsrzf 🇳🇿 0 63 6ms 10 May 2025 106th targrik 0 63 7ms 8 Oct 2025 106th GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 106th fuzzylojik-golf 🇺🇸 0 63 142ms 16 hours ago 115th CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 115th ndren 0 64 18ms 3 Dec 2024 115th lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 115th emgordon154 0 64 19ms 9 May 2025 115th error256 0 64 4,375ms 15 Jan 2026 115th anter69 🇭🇺 0 64 19ms 4 Feb 2026 115th albanian-laundromat 0 64 18ms 22 Feb 2026 115th albanian-laundromat 0 64 547ms 23 Feb 2026 123rd Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 123rd GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 123rd dokutan 0 65 359ms 14 Feb 2026 126th dokutan 0 66 19ms 18 Aug 2025 126th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 126th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 126th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 130th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 130th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 130th namelessiw 0 67 407ms 2 Nov 2025 130th error256 0 67 111ms 30 Jan 2026 130th CaedenHarper 🇨🇦 0 67 770ms 2 days ago 130th fuzzylojik-golf 🇺🇸 0 67 490ms 16 hours ago 136th Yax42 🇫🇷 0 68 12ms 30 mins ago 137th 4atj 0 69 1,159ms 21 May 2025 137th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 137th error256 0 69 410ms 44 hours ago 140th btnlq 0 70 193ms 4 Dec 2024 140th kg583 🇺🇸 0 70 128ms 3 Oct 2025 140th error256 0 70 133ms 15 Jan 2026 140th error256 0 70 18ms 11 days ago 144th GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 144th GolfingSuccess 🇬🇷 0 71 25ms 12 Jan 2026 144th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 147th edsrzf 🇳🇿 0 72 546ms 9 May 2025 147th kg583 🇺🇸 0 72 18ms 2 Oct 2025 147th rucin93 🇵🇱 0 72 9ms 17 days ago 147th aksyristos 0 72 247ms 12 days ago 147th blaztoma 🇱🇹 0 72 122ms 2 hours ago 147th Emutis 🇱🇹 0 72 121ms 117 mins ago 153rd IISResetMe 0 73 429ms 10 Jan 2026 154th rhdqor213 0 74 3ms 11 May 2025 154th saito-ta 🇯🇵 0 74 3ms 11 May 2025 154th error256 0 74 3ms 12 Jan 2026 154th dokutan 0 74 65ms 8 Feb 2026 154th lukegustafson 🇺🇸 0 74 190ms 15 days ago 154th albanian-laundromat 0 74 9ms 7 days ago 160th ovs-code 🇩🇪 0 75 18ms 23 Feb 2025 First Prev 81–160 of 289 Next Last