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 error256 0 55 2,813ms 15 Feb 2026 82nd kg583 🇺🇸 0 56 562ms 1 Dec 2024 82nd GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 82nd kg583 🇺🇸 0 56 9ms 14 Jan 2026 82nd GolfingSuccess 🇬🇷 0 56 488ms 22 Jan 2026 82nd Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 82nd edsrzf 🇳🇿 0 56 9ms 8 hours ago 82nd helbling 🇨🇭 0 56 40ms 7 hours ago 82nd CaedenHarper 🇨🇦 0 56 14ms 4 hours ago 90th edsrzf 🇳🇿 0 57 13ms 10 May 2025 90th pardouin 🇫🇷 0 57 572ms 14 Feb 2026 90th GolfingSuccess 🇬🇷 0 57 213ms 15 days ago 90th rucin93 🇵🇱 0 57 211ms 15 days ago 90th MeWhenI 🇻🇦 0 57 37ms 8 mins ago 95th sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 96th lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 96th ovs-code 🇩🇪 0 59 413ms 23 Feb 2025 96th error256 0 59 68ms 13 Jan 2026 96th madex 🇩🇪 0 59 2,743ms 3 days ago 100th khvdm 0 60 144ms 13 Jan 2025 100th emgordon154 0 60 379ms 9 May 2025 100th albanian-laundromat 0 60 369ms 22 Feb 2026 100th sean-niemann 🇺🇸 0 60 458ms 3 days ago 100th Seek64 🇩🇪 0 60 125ms 11 hours ago 100th HumanoidCPU 0 60 562ms 3 hours ago 106th DialFrost 🇸🇬 0 61 25ms 24 Feb 2025 106th voytxt 🇨🇿 0 61 62ms 1 Jan 2026 106th albanian-laundromat 0 61 26ms 20 days ago 106th aksyristos 0 61 11ms 6 days ago 110th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 110th XenThe 🇬🇧 0 62 11ms 15 Jul 2025 110th pardouin 🇫🇷 0 62 192ms 14 Feb 2026 110th Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 110th JOrE20 0 62 28ms 25 days ago 115th kg583 🇺🇸 0 63 904ms 1 Dec 2024 115th hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 115th Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 115th sean-niemann 🇺🇸 0 63 7ms 9 May 2025 115th rucin93 🇵🇱 0 63 7ms 10 May 2025 115th edsrzf 🇳🇿 0 63 6ms 10 May 2025 115th targrik 0 63 7ms 8 Oct 2025 115th GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 115th fuzzylojik-golf 🇺🇸 0 63 142ms 27 hours ago 124th CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 124th ndren 0 64 18ms 3 Dec 2024 124th lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 124th emgordon154 0 64 19ms 9 May 2025 124th error256 0 64 4,375ms 15 Jan 2026 124th anter69 🇭🇺 0 64 19ms 4 Feb 2026 124th albanian-laundromat 0 64 18ms 22 Feb 2026 124th albanian-laundromat 0 64 547ms 23 Feb 2026 124th HumanoidCPU 0 64 256ms 3 hours ago 133rd Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 133rd GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 133rd dokutan 0 65 359ms 14 Feb 2026 136th dokutan 0 66 19ms 18 Aug 2025 136th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 136th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 136th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 140th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 140th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 140th namelessiw 0 67 407ms 2 Nov 2025 140th error256 0 67 111ms 30 Jan 2026 140th CaedenHarper 🇨🇦 0 67 553ms 3 days ago 140th fuzzylojik-golf 🇺🇸 0 67 490ms 27 hours ago 146th Yax42 🇫🇷 0 68 12ms 10 hours ago 147th 4atj 0 69 1,159ms 21 May 2025 147th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 147th error256 0 69 410ms 2 days ago 150th btnlq 0 70 193ms 4 Dec 2024 150th kg583 🇺🇸 0 70 128ms 3 Oct 2025 150th error256 0 70 133ms 15 Jan 2026 150th error256 0 70 18ms 11 days ago 154th GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 154th GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 154th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 154th ovs-code 🇩🇪 0 71 134ms 9 hours ago 154th edsrzf 🇳🇿 0 71 18ms 101 mins ago 154th kg583 🇺🇸 0 71 18ms 11 mins ago 160th edsrzf 🇳🇿 0 72 546ms 9 May 2025 First Prev 81–160 of 306 Next Last