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 bytes. 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 Bytes Time Submitted 859th BREMAUCY 🇫🇷 0 65 12ms 1 Jul 2025 859th Quentin-AC 0 65 10ms 2 Jul 2025 859th qpwoeirut 0 65 11ms 3 Jul 2025 859th jak-ch-ll 0 65 12ms 6 Jul 2025 859th anter69 🇭🇺 0 65 12ms 9 Jul 2025 859th Flekay 🇩🇪 0 65 11ms 10 Jul 2025 859th klixel 🇨🇦 0 65 10ms 11 Jul 2025 859th KasperKivimaeki 🇫🇮 0 65 10ms 15 Jul 2025 859th Nyandereian 0 65 10ms 15 Jul 2025 859th itu-itis21-akkoyuno21 0 65 11ms 15 Jul 2025 859th GrayJoKing 🇦🇺 0 65 11ms 18 Jul 2025 859th AbrahamJLR 🇻🇪 0 65 13ms 18 Jul 2025 859th RaBa21 🇭🇺 0 65 11ms 19 Jul 2025 859th jeetsh4h 0 65 10ms 19 Jul 2025 859th LostSyntax21 🇬🇧 0 65 12ms 19 Jul 2025 859th wuduculfre 0 65 12ms 21 Jul 2025 859th yjgnaw 0 65 10ms 24 Jul 2025 859th oween12 0 65 11ms 6 Aug 2025 859th xiaoyiming123 0 65 12ms 11 Aug 2025 859th EthanJantz 0 65 11ms 12 Aug 2025 859th wobblybits 0 65 13ms 14 Aug 2025 859th janlelis 0 65 12ms 14 Aug 2025 859th ShaanveerS 0 65 12ms 17 Aug 2025 859th ut0s 0 65 10ms 23 Aug 2025 859th HETHAT 🇩🇿 0 65 12ms 3 Sep 2025 859th republic82 0 65 12ms 13 Sep 2025 859th snoozingnewt 🇨🇦 0 65 8ms 15 Sep 2025 859th snoozingnewt 🇨🇦 0 65 177ms 15 Sep 2025 859th snoozingnewt 🇨🇦 0 65 11ms 15 Sep 2025 859th snoozingnewt 🇨🇦 0 65 3ms 15 Sep 2025 859th hellopir2 0 65 11ms 18 Sep 2025 859th edsrzf 🇳🇿 0 65 4ms 18 Sep 2025 859th GolfingSuccess 🇬🇷 0 65 4ms 19 Sep 2025 859th DialFrost 🇸🇬 0 65 4ms 19 Sep 2025 859th now4est 🇯🇵 0 65 12ms 21 Sep 2025 859th ahmetdemirag 🇨🇾 0 65 12ms 24 Sep 2025 859th J09M 0 65 11ms 25 Sep 2025 859th ShikChen 🇹🇼 0 65 12ms 26 Sep 2025 859th Shanethegamer 🇺🇸 0 65 4ms 28 Sep 2025 859th davecame 0 65 12ms 3 Oct 2025 859th CommandLeo 🇮🇹 0 65 12ms 4 Oct 2025 859th pixelated-pup 0 65 10ms 6 Oct 2025 859th snoozingnewt 🇨🇦 0 65 5ms 6 Oct 2025 859th luuumine 🇫🇷 0 65 12ms 8 Oct 2025 859th fvla 0 65 11ms 14 Oct 2025 859th asarvazyan 0 65 11ms 18 Oct 2025 859th intgrah 0 65 12ms 22 Oct 2025 859th Matter1024 🇮🇳 0 65 12ms 15 Nov 2025 859th j-zhang43 0 65 11ms 17 Nov 2025 859th msbranicky 0 65 7ms 18 Nov 2025 859th sunleonid 0 65 10ms 21 Nov 2025 859th MeWhenI 🇻🇦 0 65 4ms 23 Nov 2025 859th Babafaba 0 65 11ms 24 Nov 2025 859th JOrE20 0 65 11ms 25 Nov 2025 859th Emutis 🇱🇹 0 65 12ms 26 Nov 2025 859th edsrzf 🇳🇿 0 65 147ms 28 Nov 2025 859th Languag3 0 65 12ms 5 Dec 2025 859th FortuiteMan 🇫🇷 0 65 10ms 13 Dec 2025 859th yujqiao 0 65 11ms 15 Dec 2025 859th toubsen 🇩🇪 0 65 7ms 30 Dec 2025 859th HumanoidCPU 0 65 5ms 1 Jan 2026 859th HumanoidCPU 0 65 3ms 1 Jan 2026 859th jakcharvat 0 65 10ms 13 Jan 2026 859th FoxInTheClouds 0 65 10ms 30 Jan 2026 859th Steffan153 🇫🇮 0 65 10ms 11 Feb 2026 859th 5cw 🇺🇸 0 65 10ms 11 Feb 2026 859th theobori 0 65 11ms 26 days ago 859th Aquateraneal 🇺🇸 0 65 10ms 23 days ago 859th edward-Han1024 0 65 10ms 23 days ago 859th randolchance 0 65 12ms 19 days ago 859th CheeseCake628 🇳🇴 0 65 12ms 19 days ago 859th dokutan 0 65 4ms 2 days ago 1,033rd Shanethegamer 🇺🇸 0 66 109ms 22 Nov 2024 1,033rd GolfingSuccess 🇬🇷 0 66 88ms 25 Nov 2024 1,033rd Natanaelel 🇸🇪 0 66 193ms 9 Dec 2024 1,033rd MeWhenI 🇻🇦 0 66 3ms 11 Dec 2024 1,033rd rollershutter 0 66 12ms 18 Dec 2024 1,033rd duckyluuk 🇳🇱 0 66 2ms 12 Jan 2025 1,033rd duckyluuk 🇳🇱 0 66 180ms 12 Jan 2025 1,033rd GolfingSuccess 🇬🇷 0 66 11ms 5 Feb 2025 First Prev 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