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 79th kg583 🇺🇸 0 56 9ms 14 Jan 2026 79th GolfingSuccess 🇬🇷 0 56 488ms 22 Jan 2026 79th Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 79th edsrzf 🇳🇿 0 56 9ms 67 mins ago 79th helbling 🇨🇭 0 56 40ms 16 mins ago 86th edsrzf 🇳🇿 0 57 13ms 10 May 2025 86th pardouin 🇫🇷 0 57 572ms 14 Feb 2026 86th GolfingSuccess 🇬🇷 0 57 213ms 15 days ago 86th rucin93 🇵🇱 0 57 211ms 15 days ago 90th sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 91st lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 91st ovs-code 🇩🇪 0 59 413ms 23 Feb 2025 91st error256 0 59 68ms 13 Jan 2026 91st madex 🇩🇪 0 59 2,743ms 3 days ago 95th khvdm 0 60 144ms 13 Jan 2025 95th emgordon154 0 60 379ms 9 May 2025 95th albanian-laundromat 0 60 369ms 22 Feb 2026 95th sean-niemann 🇺🇸 0 60 458ms 2 days ago 95th Seek64 🇩🇪 0 60 125ms 4 hours ago 100th DialFrost 🇸🇬 0 61 25ms 24 Feb 2025 100th voytxt 🇨🇿 0 61 62ms 1 Jan 2026 100th albanian-laundromat 0 61 26ms 20 days ago 100th aksyristos 0 61 11ms 6 days ago 104th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 104th XenThe 🇬🇧 0 62 11ms 15 Jul 2025 104th pardouin 🇫🇷 0 62 192ms 14 Feb 2026 104th Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 104th JOrE20 0 62 28ms 25 days ago 109th kg583 🇺🇸 0 63 904ms 1 Dec 2024 109th hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 109th Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 109th sean-niemann 🇺🇸 0 63 7ms 9 May 2025 109th rucin93 🇵🇱 0 63 7ms 10 May 2025 109th edsrzf 🇳🇿 0 63 6ms 10 May 2025 109th targrik 0 63 7ms 8 Oct 2025 109th GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 109th fuzzylojik-golf 🇺🇸 0 63 142ms 20 hours ago 118th CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 118th ndren 0 64 18ms 3 Dec 2024 118th lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 118th emgordon154 0 64 19ms 9 May 2025 118th error256 0 64 4,375ms 15 Jan 2026 118th anter69 🇭🇺 0 64 19ms 4 Feb 2026 118th albanian-laundromat 0 64 18ms 22 Feb 2026 118th albanian-laundromat 0 64 547ms 23 Feb 2026 126th Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 126th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 126th dokutan 0 65 359ms 14 Feb 2026 129th dokutan 0 66 19ms 18 Aug 2025 129th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 129th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 129th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 133rd Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 133rd Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 133rd namelessiw 0 67 407ms 2 Nov 2025 133rd error256 0 67 111ms 30 Jan 2026 133rd CaedenHarper 🇨🇦 0 67 553ms 3 days ago 133rd fuzzylojik-golf 🇺🇸 0 67 490ms 20 hours ago 139th Yax42 🇫🇷 0 68 12ms 4 hours ago 140th 4atj 0 69 1,159ms 21 May 2025 140th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 140th error256 0 69 410ms 47 hours ago 143rd btnlq 0 70 193ms 4 Dec 2024 143rd kg583 🇺🇸 0 70 128ms 3 Oct 2025 143rd error256 0 70 133ms 15 Jan 2026 143rd error256 0 70 18ms 11 days ago 147th GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 147th GolfingSuccess 🇬🇷 0 71 25ms 12 Jan 2026 147th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 147th ovs-code 🇩🇪 0 71 134ms 2 hours ago 151st edsrzf 🇳🇿 0 72 546ms 9 May 2025 151st kg583 🇺🇸 0 72 18ms 2 Oct 2025 151st rucin93 🇵🇱 0 72 9ms 17 days ago 151st aksyristos 0 72 247ms 12 days ago 151st blaztoma 🇱🇹 0 72 123ms 6 hours ago 151st Emutis 🇱🇹 0 72 121ms 5 hours ago 151st KasperKivimaeki 🇫🇮 0 72 4ms 42 mins ago 158th IISResetMe 0 73 429ms 10 Jan 2026 159th rhdqor213 0 74 3ms 11 May 2025 159th saito-ta 🇯🇵 0 74 3ms 11 May 2025 First Prev 81–160 of 295 Next Last