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 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 159th CornerMercury 🇬🇧 0 56 15ms 3 Dec 2024 159th ndren 0 56 16ms 3 Dec 2024 159th lifthrasiir 🇰🇷 0 56 37ms 11 Dec 2024 159th GolfingSuccess 🇬🇷 0 56 16ms 30 Dec 2024 159th khvdm 0 56 16ms 12 Jan 2025 159th pardouin 🇫🇷 0 56 16ms 24 Feb 2025 159th Shanethegamer 🇺🇸 0 56 66ms 30 Apr 2025 159th GolfingSuccess 🇬🇷 0 56 70ms 8 May 2025 159th sean-niemann 🇺🇸 0 56 67ms 8 May 2025 159th sean-niemann 🇺🇸 0 56 16ms 8 May 2025 159th emgordon154 0 56 16ms 9 May 2025 159th dokutan 0 56 16ms 18 Aug 2025 159th albanian-laundromat 0 56 16ms 2 Dec 2025 159th DialFrost 🇸🇬 0 56 2,628ms 16 Dec 2025 159th Steffan153 🇫🇮 0 56 16ms 21 Feb 2026 159th fuzzylojik-golf 🇺🇸 0 56 17ms 2 days ago 159th Seek64 🇩🇪 0 56 16ms 45 hours ago 159th BREMAUCY 🇫🇷 0 56 16ms 43 hours ago 159th HumanoidCPU 0 56 15ms 30 hours ago 159th plcc0 0 56 17ms 16 hours ago 181st Shanethegamer 🇺🇸 0 57 326ms 25 May 2025 181st sean-niemann 🇺🇸 0 57 176ms 25 May 2025 181st edsrzf 🇳🇿 0 57 167ms 25 May 2025 181st GolfingSuccess 🇬🇷 0 57 171ms 13 Dec 2025 181st Matter1024 🇮🇳 0 57 68ms 13 Feb 2026 181st albanian-laundromat 0 57 296ms 2 days ago 187th GolfingSuccess 🇬🇷 0 58 4,218ms 8 May 2025 187th dokutan 0 58 189ms 10 hours ago 189th GolfingSuccess 🇬🇷 0 59 17ms 8 May 2025 189th IanUtley 0 59 18ms 8 May 2025 189th GolfingSuccess 🇬🇷 0 59 63ms 8 May 2025 192nd pardouin 🇫🇷 0 60 2,725ms 15 Feb 2026 192nd fuzzylojik-golf 🇺🇸 0 60 16ms 2 days ago 192nd emgordon154 0 60 3,008ms 26 hours ago 192nd edsrzf 🇳🇿 0 60 2,595ms 24 hours ago 192nd fuzzylojik-golf 🇺🇸 0 60 2,673ms 18 hours ago 197th GolfingSuccess 🇬🇷 0 61 2,438ms 8 May 2025 197th madex 🇩🇪 0 61 2,738ms 4 days ago 199th AlephSquirrel 0 62 15ms 25 Nov 2024 199th btnlq 0 62 15ms 4 Dec 2024 199th Shanethegamer 🇺🇸 0 62 16ms 10 Dec 2024 199th Artemis21 🇬🇧 0 62 16ms 24 Dec 2024 199th ovs-code 🇩🇪 0 62 15ms 5 Jan 2025 199th bricknellj 0 62 16ms 30 Jan 2025 199th DialFrost 🇸🇬 0 62 15ms 17 Feb 2025 199th error256 0 62 16ms 12 Apr 2025 199th MeWhenI 🇻🇦 0 62 14ms 8 May 2025 199th Shanethegamer 🇺🇸 0 62 2,495ms 8 May 2025 199th 4atj 0 62 16ms 9 May 2025 199th Natanaelel 🇸🇪 0 62 16ms 11 May 2025 199th hiichbindermax 0 62 18ms 17 Aug 2025 199th 5cw 🇺🇸 0 62 15ms 22 Aug 2025 199th commandz0 🇺🇸 0 62 15ms 27 Aug 2025 199th SirBogman 🇺🇸 0 62 15ms 12 Oct 2025 199th KasperKivimaeki 🇫🇮 0 62 15ms 20 Oct 2025 199th GolfingSuccess 🇬🇷 0 62 5ms 13 Dec 2025 199th Matter1024 🇮🇳 0 62 15ms 12 Feb 2026 199th lukegustafson 🇺🇸 0 62 36ms 16 days ago 199th aksyristos 0 62 14ms 14 days ago 199th madex 🇩🇪 0 62 15ms 6 days ago 199th CaedenHarper 🇨🇦 0 62 16ms 4 days ago 199th KatieLG 🇬🇧 0 62 17ms 2 days ago 199th KatieLG 🇬🇧 0 62 416ms 2 days ago 199th scpchicken 🇵🇼 0 62 15ms 2 days ago 199th StefanHabel 🇨🇦 0 62 15ms 47 hours ago 199th blaztoma 🇱🇹 0 62 15ms 45 hours ago 199th Emutis 🇱🇹 0 62 16ms 43 hours ago 199th Andrey2001 0 62 16ms 37 hours ago 199th anter69 🇭🇺 0 62 15ms 33 hours ago 199th qpwoeirut 0 62 17ms 25 hours ago 199th stefangimmillaro 0 62 16ms 24 hours ago 199th btjones0 0 62 15ms 22 hours ago 199th bzijlema 🇳🇱 0 62 16ms 19 hours ago 199th ahmetdemirag 🇨🇾 0 62 15ms 16 hours ago 199th Pyroan 0 62 19ms 9 hours ago 199th edsrzf 🇳🇿 0 62 15ms 8 hours ago 199th zacjl 0 62 17ms 80 mins ago 199th MeWhenI 🇻🇦 0 62 86ms 10 mins ago 239th sean-niemann 🇺🇸 0 63 43ms 8 May 2025 239th albanian-laundromat 0 63 44ms 14 Jan 2026 First Prev 161–240 of 411 Next Last