The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 149th CornerMercury 🇬🇧 0 63 420ms 6 hours ago 149th CornerMercury 🇬🇧 0 63 21ms 6 hours ago 163rd lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 163rd emgordon154 0 64 19ms 9 May 2025 163rd error256 0 64 4,375ms 15 Jan 2026 163rd anter69 🇭🇺 0 64 19ms 4 Feb 2026 163rd albanian-laundromat 0 64 18ms 22 Feb 2026 163rd albanian-laundromat 0 64 547ms 23 Feb 2026 163rd HumanoidCPU 0 64 256ms 2 days ago 170th Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 170th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 170th dokutan 0 65 359ms 14 Feb 2026 173rd dokutan 0 66 19ms 18 Aug 2025 173rd Yax42 🇫🇷 0 66 470ms 6 Jan 2026 173rd AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 173rd GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 173rd edsrzf 🇳🇿 0 66 11ms 2 days ago 173rd Steffan153 🇫🇮 0 66 10ms 41 hours ago 179th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 179th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 179th namelessiw 0 67 407ms 2 Nov 2025 179th error256 0 67 111ms 30 Jan 2026 179th CaedenHarper 🇨🇦 0 67 553ms 6 days ago 179th fuzzylojik-golf 🇺🇸 0 67 490ms 3 days ago 179th madex 🇩🇪 0 67 9ms 15 hours ago 186th Yax42 🇫🇷 0 68 16ms 3 days ago 187th 4atj 0 69 1,159ms 21 May 2025 187th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 187th error256 0 69 410ms 5 days ago 187th edsrzf 🇳🇿 0 69 394ms 2 days ago 191st btnlq 0 70 193ms 4 Dec 2024 191st error256 0 70 133ms 15 Jan 2026 191st error256 0 70 18ms 14 days ago 191st DialFrost 🇸🇬 0 70 116ms 31 hours ago 195th GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 195th GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 195th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 195th ovs-code 🇩🇪 0 71 134ms 3 days ago 195th edsrzf 🇳🇿 0 71 18ms 2 days ago 195th kg583 🇺🇸 0 71 18ms 2 days ago 195th rhdqor213 0 71 4ms 2 days ago 195th ovs-code 🇩🇪 0 71 129ms 30 hours ago 203rd rucin93 🇵🇱 0 72 9ms 20 days ago 203rd aksyristos 0 72 247ms 15 days ago 203rd blaztoma 🇱🇹 0 72 123ms 3 days ago 203rd Emutis 🇱🇹 0 72 121ms 3 days ago 203rd KasperKivimaeki 🇫🇮 0 72 4ms 3 days ago 203rd edsrzf 🇳🇿 0 72 9ms 2 days ago 203rd zacjl 0 72 131ms 43 hours ago 203rd Steffan153 🇫🇮 0 72 3ms 32 hours ago 211th saito-ta 🇯🇵 0 74 3ms 11 May 2025 211th error256 0 74 3ms 12 Jan 2026 211th dokutan 0 74 65ms 8 Feb 2026 211th lukegustafson 🇺🇸 0 74 189ms 18 days ago 211th albanian-laundromat 0 74 9ms 10 days ago 216th Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 216th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 216th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 216th albanian-laundromat 0 75 108ms 5 Jan 2026 216th albanian-laundromat 0 75 455ms 6 Jan 2026 216th GolfingSuccess 🇬🇷 0 75 19ms 11 Jan 2026 216th albanian-laundromat 0 75 238ms 25 days ago 216th madex 🇩🇪 0 75 34ms 9 days ago 216th CaedenHarper 🇨🇦 0 75 149ms 6 days ago 216th Yax42 🇫🇷 0 75 4ms 3 days ago 216th edsrzf 🇳🇿 0 75 17ms 2 days ago 216th zgialor-lab 0 75 25ms 2 days ago 216th madex 🇩🇪 0 75 439ms 15 hours ago 229th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 229th ovs-code 🇩🇪 0 76 3ms 10 May 2025 229th AlephSquirrel 0 76 43ms 3 Dec 2025 229th AlephSquirrel 0 76 445ms 3 Dec 2025 229th albanian-laundromat 0 76 18ms 24 days ago 229th albanian-laundromat 0 76 188ms 18 days ago 229th MeWhenI 🇻🇦 0 76 586ms 11 days ago 229th MeWhenI 🇻🇦 0 76 184ms 2 days ago 229th duckyluuk 🇳🇱 0 76 128ms 31 hours ago 238th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 238th DialFrost 🇸🇬 0 77 18ms 8 May 2025 238th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 First Prev 161–240 of 383 Next Last