The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 705th snoozingnewt 🇨🇦 0 59 14ms 15 Sep 2025 705th gaving-quadprep 0 59 60ms 26 Oct 2025 705th FlyingPenguin223 0 59 3ms 14 Nov 2025 705th MeWhenI 🇻🇦 0 59 2ms 14 Nov 2025 725th xsot 🇸🇬 0 60 5ms 4 Dec 2024 725th CatsAreFluffy 0 60 58ms 13 Dec 2024 725th emgordon154 0 60 2,677ms 4 Feb 2025 725th klixel 🇨🇦 0 60 89ms 8 Apr 2025 725th emgordon154 0 60 2ms 5 Aug 2025 725th emgordon154 0 60 89ms 5 Nov 2025 725th Babafaba 0 60 542ms 24 Nov 2025 725th dokutan 0 60 4ms 9 Feb 2026 733rd Shanethegamer 🇺🇸 0 61 12ms 20 Nov 2024 733rd stefangimmillaro 0 61 14ms 21 Nov 2024 733rd error256 0 61 14ms 21 Nov 2024 733rd ovs-code 🇩🇪 0 61 13ms 25 Nov 2024 733rd GolfingSuccess 🇬🇷 0 61 12ms 25 Nov 2024 733rd sean-niemann 🇺🇸 0 61 13ms 26 Nov 2024 733rd duckyluuk 🇳🇱 0 61 13ms 26 Nov 2024 733rd DialFrost 🇸🇬 0 61 13ms 26 Nov 2024 733rd rucin93 🇵🇱 0 61 12ms 26 Nov 2024 733rd emgordon154 0 61 13ms 28 Nov 2024 733rd stefangimmillaro 0 61 7ms 3 Dec 2024 733rd lukegustafson 🇺🇸 0 61 12ms 7 Dec 2024 733rd MeWhenI 🇻🇦 0 61 14ms 11 Dec 2024 733rd emplv 🇱🇻 0 61 13ms 11 Dec 2024 733rd voytxt 🇨🇿 0 61 13ms 22 Dec 2024 733rd Salutations45 0 61 13ms 29 Dec 2024 733rd duckyluuk 🇳🇱 0 61 2,010ms 12 Jan 2025 733rd CLOStrophobic 🇮🇹 0 61 13ms 22 Jan 2025 733rd voytxt 🇨🇿 0 61 5ms 25 Jan 2025 733rd m-tkach 🇺🇦 0 61 13ms 30 Jan 2025 733rd Natanaelel 🇸🇪 0 61 13ms 2 Feb 2025 733rd CaedenHarper 🇨🇦 0 61 12ms 3 Feb 2025 733rd BalaM314 0 61 12ms 4 Feb 2025 733rd kg583 🇺🇸 0 61 77ms 5 Feb 2025 733rd GolfingSuccess 🇬🇷 0 61 69ms 5 Feb 2025 733rd targrik 0 61 12ms 8 Feb 2025 733rd MeWhenI 🇻🇦 0 61 3ms 14 Feb 2025 733rd targrik 0 61 3ms 15 Feb 2025 733rd attila8192 0 61 14ms 1 Mar 2025 733rd targrik 0 61 2ms 14 Mar 2025 733rd janlelis 0 61 13ms 31 Mar 2025 733rd b-illy 🇬🇧 0 61 13ms 16 Apr 2025 733rd janbehrens 🇩🇪 0 61 13ms 17 Apr 2025 733rd pardouin 🇫🇷 0 61 13ms 17 Apr 2025 733rd Shanethegamer 🇺🇸 0 61 81ms 17 Apr 2025 733rd edsrzf 🇳🇿 0 61 13ms 17 Apr 2025 733rd HumanoidCPU 0 61 76ms 18 Apr 2025 733rd HumanoidCPU 0 61 12ms 18 Apr 2025 733rd AlephSquirrel 0 61 13ms 20 Apr 2025 733rd Sam-Vrgl 0 61 14ms 13 May 2025 733rd c-py 0 61 12ms 14 May 2025 733rd albanian-laundromat 0 61 76ms 6 Jun 2025 733rd Andrey-Plotnikov 0 61 13ms 19 Jun 2025 733rd a6166231 🇨🇳 0 61 13ms 20 Jun 2025 733rd BREMAUCY 🇫🇷 0 61 12ms 1 Jul 2025 733rd RYSF13 🇨🇳 0 61 12ms 5 Jul 2025 733rd p01 0 61 13ms 28 Jul 2025 733rd KrausRaus 🇺🇸 0 61 14ms 29 Jul 2025 733rd dmrichwa 🇺🇸 0 61 14ms 29 Jul 2025 733rd dokutan 0 61 2ms 5 Aug 2025 733rd gitchaell 🇧🇴 0 61 13ms 6 Aug 2025 733rd lukepolak 0 61 14ms 7 Aug 2025 733rd adrianbgo 0 61 13ms 7 Aug 2025 733rd helbling 🇨🇭 0 61 14ms 28 Aug 2025 733rd snoozingnewt 🇨🇦 0 61 75ms 15 Sep 2025 733rd snoozingnewt 🇨🇦 0 61 12ms 15 Sep 2025 733rd larsendaniel 0 61 12ms 7 Nov 2025 733rd JOrE20 0 61 12ms 18 Nov 2025 733rd GodlyProgrammer1 0 61 13ms 22 Nov 2025 733rd Kacarott 🇦🇺 0 61 104ms 25 Nov 2025 733rd egertaia 0 61 13ms 9 Jan 2026 733rd r58iiz 0 61 12ms 15 Jan 2026 733rd ragonscreen 0 61 12ms 16 Jan 2026 733rd matzuka 0 61 39ms 29 Jan 2026 733rd FoxInTheClouds 0 61 13ms 5 Feb 2026 733rd Ultra814 0 61 12ms 19 Feb 2026 733rd weliveinhell 🇭🇹 0 61 12ms 18 days ago 733rd marcuswilcour 0 61 12ms 5 days ago First Prev 721–800 of 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