The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 148th CornerMercury 🇬🇧 0 63 21ms 16 hours ago 162nd lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 162nd emgordon154 0 64 19ms 9 May 2025 162nd error256 0 64 4,375ms 15 Jan 2026 162nd anter69 🇭🇺 0 64 19ms 4 Feb 2026 162nd albanian-laundromat 0 64 18ms 22 Feb 2026 162nd albanian-laundromat 0 64 547ms 23 Feb 2026 162nd HumanoidCPU 0 64 256ms 3 days ago 169th Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 169th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 169th dokutan 0 65 359ms 14 Feb 2026 172nd dokutan 0 66 19ms 18 Aug 2025 172nd Yax42 🇫🇷 0 66 470ms 6 Jan 2026 172nd AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 172nd GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 172nd edsrzf 🇳🇿 0 66 11ms 3 days ago 172nd Steffan153 🇫🇮 0 66 10ms 2 days ago 178th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 178th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 178th namelessiw 0 67 407ms 2 Nov 2025 178th error256 0 67 111ms 30 Jan 2026 178th CaedenHarper 🇨🇦 0 67 553ms 6 days ago 178th fuzzylojik-golf 🇺🇸 0 67 490ms 4 days ago 178th madex 🇩🇪 0 67 9ms 25 hours ago 185th Yax42 🇫🇷 0 68 16ms 3 days ago 186th 4atj 0 69 1,159ms 21 May 2025 186th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 186th error256 0 69 410ms 5 days ago 186th edsrzf 🇳🇿 0 69 394ms 3 days ago 190th btnlq 0 70 193ms 4 Dec 2024 190th error256 0 70 133ms 15 Jan 2026 190th error256 0 70 18ms 14 days ago 190th DialFrost 🇸🇬 0 70 116ms 41 hours ago 194th GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 194th GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 194th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 194th ovs-code 🇩🇪 0 71 134ms 3 days ago 194th edsrzf 🇳🇿 0 71 18ms 3 days ago 194th kg583 🇺🇸 0 71 18ms 3 days ago 194th rhdqor213 0 71 4ms 3 days ago 194th ovs-code 🇩🇪 0 71 129ms 40 hours ago 202nd rucin93 🇵🇱 0 72 9ms 20 days ago 202nd aksyristos 0 72 247ms 16 days ago 202nd blaztoma 🇱🇹 0 72 123ms 3 days ago 202nd Emutis 🇱🇹 0 72 121ms 3 days ago 202nd KasperKivimaeki 🇫🇮 0 72 4ms 3 days ago 202nd edsrzf 🇳🇿 0 72 9ms 3 days ago 202nd zacjl 0 72 131ms 2 days ago 202nd Steffan153 🇫🇮 0 72 3ms 42 hours ago 210th saito-ta 🇯🇵 0 74 3ms 11 May 2025 210th error256 0 74 3ms 12 Jan 2026 210th dokutan 0 74 65ms 8 Feb 2026 210th lukegustafson 🇺🇸 0 74 189ms 19 days ago 210th albanian-laundromat 0 74 9ms 11 days ago 215th Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 215th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 215th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 215th albanian-laundromat 0 75 108ms 5 Jan 2026 215th albanian-laundromat 0 75 455ms 6 Jan 2026 215th GolfingSuccess 🇬🇷 0 75 19ms 11 Jan 2026 215th albanian-laundromat 0 75 238ms 25 days ago 215th madex 🇩🇪 0 75 34ms 9 days ago 215th CaedenHarper 🇨🇦 0 75 149ms 6 days ago 215th Yax42 🇫🇷 0 75 4ms 3 days ago 215th edsrzf 🇳🇿 0 75 17ms 3 days ago 215th zgialor-lab 0 75 25ms 2 days ago 215th madex 🇩🇪 0 75 439ms 25 hours ago 228th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 228th ovs-code 🇩🇪 0 76 4ms 10 May 2025 228th AlephSquirrel 0 76 43ms 3 Dec 2025 228th AlephSquirrel 0 76 445ms 3 Dec 2025 228th albanian-laundromat 0 76 18ms 25 days ago 228th albanian-laundromat 0 76 188ms 19 days ago 228th MeWhenI 🇻🇦 0 76 586ms 12 days ago 228th MeWhenI 🇻🇦 0 76 184ms 2 days ago 228th duckyluuk 🇳🇱 0 76 128ms 41 hours ago 237th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 237th DialFrost 🇸🇬 0 77 18ms 8 May 2025 237th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 237th addmai 0 77 20ms 24 Jul 2025 First Prev 161–240 of 384 Next Last