The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 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 156th Steffan153 🇫🇮 0 66 10ms 6 hours ago 162nd Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 162nd Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 162nd namelessiw 0 67 407ms 2 Nov 2025 162nd error256 0 67 111ms 30 Jan 2026 162nd CaedenHarper 🇨🇦 0 67 553ms 4 days ago 162nd fuzzylojik-golf 🇺🇸 0 67 490ms 2 days ago 168th Yax42 🇫🇷 0 68 16ms 44 hours ago 169th 4atj 0 69 1,159ms 21 May 2025 169th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 169th error256 0 69 410ms 3 days ago 169th edsrzf 🇳🇿 0 69 394ms 29 hours ago 173rd btnlq 0 70 193ms 4 Dec 2024 173rd kg583 🇺🇸 0 70 128ms 3 Oct 2025 173rd error256 0 70 133ms 15 Jan 2026 173rd error256 0 70 18ms 12 days ago 177th GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 177th GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 177th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 177th ovs-code 🇩🇪 0 71 134ms 42 hours ago 177th edsrzf 🇳🇿 0 71 18ms 35 hours ago 177th kg583 🇺🇸 0 71 18ms 33 hours ago 177th rhdqor213 0 71 4ms 28 hours ago 184th rucin93 🇵🇱 0 72 9ms 19 days ago 184th aksyristos 0 72 247ms 14 days ago 184th blaztoma 🇱🇹 0 72 123ms 46 hours ago 184th Emutis 🇱🇹 0 72 121ms 45 hours ago 184th KasperKivimaeki 🇫🇮 0 72 4ms 40 hours ago 184th edsrzf 🇳🇿 0 72 9ms 27 hours ago 184th zacjl 0 72 131ms 8 hours ago 191st IISResetMe 0 73 310ms 10 Jan 2026 192nd saito-ta 🇯🇵 0 74 3ms 11 May 2025 192nd error256 0 74 3ms 12 Jan 2026 192nd dokutan 0 74 65ms 8 Feb 2026 192nd lukegustafson 🇺🇸 0 74 189ms 17 days ago 192nd albanian-laundromat 0 74 9ms 9 days ago 197th Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 197th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 197th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 197th albanian-laundromat 0 75 108ms 5 Jan 2026 197th albanian-laundromat 0 75 455ms 6 Jan 2026 197th GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 197th albanian-laundromat 0 75 238ms 23 days ago 197th madex 🇩🇪 0 75 18ms 7 days ago 197th CaedenHarper 🇨🇦 0 75 149ms 4 days ago 197th Yax42 🇫🇷 0 75 4ms 42 hours ago 197th edsrzf 🇳🇿 0 75 17ms 27 hours ago 197th zgialor-lab 0 75 25ms 19 hours ago 209th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 209th ovs-code 🇩🇪 0 76 3ms 10 May 2025 209th AlephSquirrel 0 76 43ms 3 Dec 2025 209th AlephSquirrel 0 76 445ms 3 Dec 2025 209th albanian-laundromat 0 76 18ms 23 days ago 209th albanian-laundromat 0 76 188ms 17 days ago 209th MeWhenI 🇻🇦 0 76 586ms 10 days ago 209th MeWhenI 🇻🇦 0 76 184ms 13 hours ago 217th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 217th DialFrost 🇸🇬 0 77 19ms 8 May 2025 217th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 217th addmai 0 77 20ms 24 Jul 2025 217th hiichbindermax 0 77 19ms 17 Aug 2025 217th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 217th davecame 0 77 135ms 25 Sep 2025 217th SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 217th jtaxen 0 77 19ms 16 Oct 2025 217th albanian-laundromat 0 77 412ms 6 Dec 2025 217th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 217th KasperKivimaeki 🇫🇮 0 77 564ms 10 days ago 217th StefanHabel 🇨🇦 0 77 1,217ms 2 days ago 217th ahmetdemirag 🇨🇾 0 77 18ms 2 days ago 217th tomh1012 0 77 17ms 2 days ago 217th qpwoeirut 0 77 20ms 33 hours ago 217th btjones0 0 77 19ms 30 hours ago 217th ComradeSquirrel 0 77 18ms 28 hours ago 217th bzijlema 🇳🇱 0 77 18ms 27 hours ago 217th Lv0Sys 🇵🇱 0 77 18ms 90 mins ago 217th duckyluuk 🇳🇱 0 77 19ms 2 mins ago 238th jameswmccarty 0 78 20ms 29 Mar 2025 238th DialFrost 🇸🇬 0 78 940ms 10 May 2025 238th DialFrost 🇸🇬 0 78 3ms 10 May 2025 First Prev 161–240 of 353 Next Last