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 Encoder 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 144th fuzzylojik-golf 🇺🇸 0 56 17ms 27 hours ago 144th Seek64 🇩🇪 0 56 16ms 19 hours ago 144th BREMAUCY 🇫🇷 0 56 16ms 17 hours ago 144th HumanoidCPU 0 56 15ms 4 hours ago 165th Shanethegamer 🇺🇸 0 57 326ms 25 May 2025 165th sean-niemann 🇺🇸 0 57 176ms 25 May 2025 165th edsrzf 🇳🇿 0 57 167ms 25 May 2025 165th GolfingSuccess 🇬🇷 0 57 171ms 13 Dec 2025 165th Matter1024 🇮🇳 0 57 68ms 13 Feb 2026 165th albanian-laundromat 0 57 296ms 37 hours ago 171st GolfingSuccess 🇬🇷 0 58 4,218ms 8 May 2025 172nd GolfingSuccess 🇬🇷 0 59 17ms 8 May 2025 172nd IanUtley 0 59 18ms 8 May 2025 172nd GolfingSuccess 🇬🇷 0 59 63ms 8 May 2025 175th pardouin 🇫🇷 0 60 2,725ms 15 Feb 2026 175th fuzzylojik-golf 🇺🇸 0 60 16ms 25 hours ago 175th emgordon154 0 60 3,008ms 15 mins ago 178th GolfingSuccess 🇬🇷 0 61 2,468ms 8 May 2025 178th madex 🇩🇪 0 61 2,738ms 3 days ago 180th AlephSquirrel 0 62 15ms 25 Nov 2024 180th btnlq 0 62 15ms 4 Dec 2024 180th Shanethegamer 🇺🇸 0 62 16ms 10 Dec 2024 180th Artemis21 🇬🇧 0 62 16ms 24 Dec 2024 180th ovs-code 🇩🇪 0 62 15ms 5 Jan 2025 180th bricknellj 0 62 16ms 30 Jan 2025 180th DialFrost 🇸🇬 0 62 15ms 17 Feb 2025 180th error256 0 62 16ms 12 Apr 2025 180th MeWhenI 🇻🇦 0 62 14ms 8 May 2025 180th Shanethegamer 🇺🇸 0 62 2,495ms 8 May 2025 180th 4atj 0 62 16ms 9 May 2025 180th Natanaelel 🇸🇪 0 62 16ms 11 May 2025 180th hiichbindermax 0 62 18ms 17 Aug 2025 180th 5cw 🇺🇸 0 62 15ms 22 Aug 2025 180th commandz0 🇺🇸 0 62 15ms 27 Aug 2025 180th SirBogman 🇺🇸 0 62 15ms 12 Oct 2025 180th KasperKivimaeki 🇫🇮 0 62 15ms 20 Oct 2025 180th GolfingSuccess 🇬🇷 0 62 5ms 13 Dec 2025 180th Matter1024 🇮🇳 0 62 15ms 12 Feb 2026 180th lukegustafson 🇺🇸 0 62 36ms 15 days ago 180th aksyristos 0 62 14ms 13 days ago 180th madex 🇩🇪 0 62 15ms 5 days ago 180th CaedenHarper 🇨🇦 0 62 16ms 3 days ago 180th KatieLG 🇬🇧 0 62 17ms 27 hours ago 180th KatieLG 🇬🇧 0 62 416ms 27 hours ago 180th scpchicken 🇵🇼 0 62 15ms 27 hours ago 180th StefanHabel 🇨🇦 0 62 15ms 21 hours ago 180th blaztoma 🇱🇹 0 62 15ms 19 hours ago 180th Emutis 🇱🇹 0 62 16ms 16 hours ago 180th Andrey2001 0 62 17ms 11 hours ago 180th anter69 🇭🇺 0 62 15ms 6 hours ago 211th sean-niemann 🇺🇸 0 63 43ms 8 May 2025 211th albanian-laundromat 0 63 44ms 14 Jan 2026 211th tomh1012 0 63 15ms 14 hours ago 214th jameswmccarty 0 64 15ms 29 Mar 2025 214th dokutan 0 64 63ms 8 Feb 2026 214th albanian-laundromat 0 64 188ms 3 days ago 217th Shanethegamer 🇺🇸 0 66 1,317ms 26 Nov 2024 217th rucin93 🇵🇱 0 66 6ms 8 May 2025 217th sean-niemann 🇺🇸 0 66 7ms 8 May 2025 217th AdrienHache 🇫🇷 0 66 421ms 2 Nov 2025 217th namelessiw 0 66 434ms 2 Nov 2025 217th GolfingSuccess 🇬🇷 0 66 430ms 4 Feb 2026 217th albanian-laundromat 0 66 1,391ms 2 days ago 217th Yax42 🇫🇷 0 66 484ms 37 hours ago 217th fuzzylojik-golf 🇺🇸 0 66 456ms 25 hours ago 226th GolfingSuccess 🇬🇷 0 67 12ms 8 May 2025 226th tomh1012 0 67 429ms 14 hours ago 228th Shanethegamer 🇺🇸 0 68 145ms 26 Nov 2024 228th sean-niemann 🇺🇸 0 68 131ms 8 May 2025 228th edsrzf 🇳🇿 0 68 113ms 25 May 2025 228th GolfingSuccess 🇬🇷 0 68 110ms 2 days ago 232nd GolfingSuccess 🇬🇷 0 69 10ms 8 May 2025 232nd CaedenHarper 🇨🇦 0 69 486ms 2 days ago 234th JOrE20 0 70 41ms 13 Feb 2026 235th kg583 🇺🇸 0 71 27ms 1 Dec 2024 235th CLOStrophobic 🇮🇹 0 71 13ms 18 Jan 2025 235th GolfingSuccess 🇬🇷 0 71 14ms 7 May 2025 235th edsrzf 🇳🇿 0 71 14ms 8 May 2025 235th AlephSquirrel 0 71 13ms 9 May 2025 240th Shanethegamer 🇺🇸 0 72 27ms 9 Dec 2024 First Prev 161–240 of 348 Next Last