The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 23 hours. Why not try and solve them ahead of time?
Tutorial 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 659th jeetsh4h 0 58 12ms 19 Jul 2025 659th wuduculfre 0 58 13ms 21 Jul 2025 659th InigoK 🇺🇸 0 58 13ms 6 Aug 2025 659th h3ra993huskp 🇯🇵 0 58 2,600ms 11 Aug 2025 659th frankgraziano 0 58 6ms 13 Aug 2025 659th robin-scragg 0 58 11ms 30 Aug 2025 659th KapelMeister 0 58 11ms 2 Sep 2025 659th travisdoesmath 0 58 13ms 6 Sep 2025 659th snoozingnewt 🇨🇦 0 58 6ms 15 Sep 2025 659th snoozingnewt 🇨🇦 0 58 4ms 15 Sep 2025 659th snoozingnewt 🇨🇦 0 58 12ms 15 Sep 2025 659th snoozingnewt 🇨🇦 0 58 3ms 15 Sep 2025 659th hellopir2 0 58 11ms 18 Sep 2025 659th now4est 🇯🇵 0 58 12ms 21 Sep 2025 659th J09M 0 58 11ms 25 Sep 2025 659th kg583 🇺🇸 0 58 4ms 27 Sep 2025 659th KatieLG 🇬🇧 0 58 11ms 2 Oct 2025 659th plcc0 0 58 6ms 7 Oct 2025 659th luuumine 🇫🇷 0 58 11ms 8 Oct 2025 659th Matter1024 🇮🇳 0 58 13ms 15 Nov 2025 659th chattyplatinumcool 0 58 13ms 18 Nov 2025 659th sunleonid 0 58 11ms 21 Nov 2025 659th TheZwierzLF 🇵🇱 0 58 535ms 21 Nov 2025 659th JOrE20 0 58 13ms 25 Nov 2025 659th JOrE20 0 58 6ms 25 Nov 2025 659th CornerMercury 🇬🇧 0 58 10ms 19 Dec 2025 659th FoxInTheClouds 0 58 11ms 30 Jan 2026 659th Steffan153 🇫🇮 0 58 12ms 21 Feb 2026 659th ndren 0 58 12ms 25 days ago 659th edward-Han1024 0 58 11ms 23 days ago 751st MeWhenI 🇻🇦 0 59 6ms 11 Dec 2024 751st lukegustafson 🇺🇸 0 59 192ms 21 Dec 2024 751st yujh-yujh 🇬🇸 0 59 13ms 3 Jan 2025 751st emgordon154 0 59 4ms 8 Jan 2025 751st duckyluuk 🇳🇱 0 59 6ms 12 Jan 2025 751st Natanaelel 🇸🇪 0 59 4ms 2 Feb 2025 751st dokutan 0 59 12ms 3 Feb 2025 751st Shanethegamer 🇺🇸 0 59 3ms 7 Feb 2025 751st voytxt 🇨🇿 0 59 6ms 8 Feb 2025 751st sohamkorade 0 59 13ms 13 Feb 2025 751st DanielBash 0 59 11ms 22 Feb 2025 751st persistz 0 59 10ms 30 Jun 2025 751st LostSyntax21 🇬🇧 0 59 4ms 19 Jul 2025 751st vgamula 🇺🇦 0 59 11ms 5 Aug 2025 751st Boowie41 0 59 11ms 10 Nov 2025 751st FlyingPenguin223 0 59 3ms 14 Nov 2025 751st MeWhenI 🇻🇦 0 59 2ms 14 Nov 2025 751st carotinoid 🇰🇷 0 59 13ms 11 days ago 769th emgordon154 0 60 182ms 28 Nov 2024 769th xsot 🇸🇬 0 60 5ms 4 Dec 2024 769th Shanethegamer 🇺🇸 0 60 171ms 10 Jan 2025 769th emgordon154 0 60 2,677ms 4 Feb 2025 769th klixel 🇨🇦 0 60 89ms 8 Apr 2025 769th swcnt 0 60 14ms 9 Apr 2025 769th rucin93 🇵🇱 0 60 187ms 17 Apr 2025 769th dokutan 0 60 193ms 6 Jun 2025 769th emgordon154 0 60 2ms 5 Aug 2025 769th emgordon154 0 60 89ms 5 Nov 2025 769th Babafaba 0 60 542ms 24 Nov 2025 769th yujqiao 0 60 12ms 15 Dec 2025 769th dokutan 0 60 4ms 9 Feb 2026 782nd Shanethegamer 🇺🇸 0 61 12ms 20 Nov 2024 782nd stefangimmillaro 0 61 14ms 21 Nov 2024 782nd error256 0 61 14ms 21 Nov 2024 782nd ovs-code 🇩🇪 0 61 13ms 25 Nov 2024 782nd GolfingSuccess 🇬🇷 0 61 12ms 25 Nov 2024 782nd sean-niemann 🇺🇸 0 61 13ms 26 Nov 2024 782nd duckyluuk 🇳🇱 0 61 13ms 26 Nov 2024 782nd DialFrost 🇸🇬 0 61 13ms 26 Nov 2024 782nd rucin93 🇵🇱 0 61 12ms 26 Nov 2024 782nd emgordon154 0 61 13ms 28 Nov 2024 782nd stefangimmillaro 0 61 7ms 3 Dec 2024 782nd lukegustafson 🇺🇸 0 61 12ms 7 Dec 2024 782nd MeWhenI 🇻🇦 0 61 14ms 11 Dec 2024 782nd emplv 🇱🇻 0 61 13ms 11 Dec 2024 782nd voytxt 🇨🇿 0 61 13ms 22 Dec 2024 782nd Salutations45 0 61 13ms 29 Dec 2024 782nd duckyluuk 🇳🇱 0 61 2,010ms 12 Jan 2025 782nd CLOStrophobic 🇮🇹 0 61 13ms 22 Jan 2025 782nd voytxt 🇨🇿 0 61 5ms 25 Jan 2025 First Prev 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