The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 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 768th pardouin 🇫🇷 0 61 13ms 17 Apr 2025 768th Shanethegamer 🇺🇸 0 61 81ms 17 Apr 2025 768th edsrzf 🇳🇿 0 61 13ms 17 Apr 2025 768th HumanoidCPU 0 61 76ms 18 Apr 2025 768th HumanoidCPU 0 61 12ms 18 Apr 2025 768th AlephSquirrel 0 61 13ms 20 Apr 2025 768th Sam-Vrgl 0 61 14ms 13 May 2025 768th c-py 0 61 12ms 14 May 2025 768th albanian-laundromat 0 61 76ms 6 Jun 2025 768th Andrey-Plotnikov 0 61 13ms 19 Jun 2025 768th a6166231 🇨🇳 0 61 13ms 20 Jun 2025 768th elana-teal 0 61 11ms 20 Jun 2025 768th BREMAUCY 🇫🇷 0 61 12ms 1 Jul 2025 768th RYSF13 🇨🇳 0 61 12ms 5 Jul 2025 768th p01 0 61 13ms 28 Jul 2025 768th KrausRaus 🇺🇸 0 61 14ms 29 Jul 2025 768th dmrichwa 🇺🇸 0 61 14ms 29 Jul 2025 768th dokutan 0 61 2ms 5 Aug 2025 768th gitchaell 🇧🇴 0 61 13ms 6 Aug 2025 768th lukepolak 0 61 14ms 7 Aug 2025 768th adrianbgo 0 61 13ms 7 Aug 2025 768th helbling 🇨🇭 0 61 14ms 28 Aug 2025 768th snoozingnewt 🇨🇦 0 61 75ms 15 Sep 2025 768th snoozingnewt 🇨🇦 0 61 12ms 15 Sep 2025 768th larsendaniel 0 61 12ms 7 Nov 2025 768th JOrE20 0 61 12ms 18 Nov 2025 768th GodlyProgrammer1 0 61 13ms 22 Nov 2025 768th Kacarott 🇦🇺 0 61 104ms 25 Nov 2025 768th egertaia 0 61 13ms 9 Jan 2026 768th r58iiz 0 61 12ms 15 Jan 2026 768th ragonscreen 0 61 12ms 16 Jan 2026 768th matzuka 0 61 39ms 29 Jan 2026 768th FoxInTheClouds 0 61 13ms 5 Feb 2026 768th Ultra814 0 61 12ms 19 Feb 2026 768th weliveinhell 🇭🇹 0 61 12ms 18 days ago 768th marcuswilcour 0 61 12ms 4 days ago 837th emgordon154 0 62 2ms 27 Nov 2024 837th CLOStrophobic 🇮🇹 0 62 3ms 4 Feb 2025 837th DialFrost 🇸🇬 0 62 11ms 15 Feb 2025 837th heanyang1 0 62 14ms 26 Mar 2025 837th dokutan 0 62 2,017ms 15 Jul 2025 837th 6512345 0 62 161ms 4 Nov 2025 843rd kg583 🇺🇸 0 63 49ms 21 Nov 2024 843rd sean-niemann 🇺🇸 0 63 162ms 10 Dec 2024 843rd MeWhenI 🇻🇦 0 63 6ms 18 Dec 2024 843rd zacjl 0 63 52ms 31 Dec 2024 843rd CLOStrophobic 🇮🇹 0 63 58ms 17 Jan 2025 843rd edsrzf 🇳🇿 0 63 50ms 9 Feb 2025 843rd GolfingSuccess 🇬🇷 0 63 49ms 9 Feb 2025 843rd Nemikolh 🇫🇷 0 63 13ms 12 Feb 2025 843rd GolfingSuccess 🇬🇷 0 63 189ms 20 Feb 2025 843rd varhammer 0 63 6ms 22 Feb 2025 843rd voytxt 🇨🇿 0 63 189ms 17 Apr 2025 843rd FlyingPenguin223 0 63 51ms 17 Apr 2025 843rd DialFrost 🇸🇬 0 63 185ms 17 Apr 2025 843rd DialFrost 🇸🇬 0 63 5ms 17 Apr 2025 843rd DialFrost 🇸🇬 0 63 49ms 17 Apr 2025 843rd pardouin 🇫🇷 0 63 176ms 17 Apr 2025 843rd Shanethegamer 🇺🇸 0 63 5ms 17 Apr 2025 843rd Shanethegamer 🇺🇸 0 63 54ms 17 Apr 2025 843rd GolfingSuccess 🇬🇷 0 63 6ms 17 Apr 2025 843rd HumanoidCPU 0 63 177ms 18 Apr 2025 843rd HumanoidCPU 0 63 7ms 18 Apr 2025 843rd HumanoidCPU 0 63 50ms 18 Apr 2025 843rd CaedenHarper 🇨🇦 0 63 163ms 18 Apr 2025 843rd CaedenHarper 🇨🇦 0 63 6ms 18 Apr 2025 843rd CaedenHarper 🇨🇦 0 63 56ms 18 Apr 2025 843rd dokutan 0 63 6ms 28 Apr 2025 843rd Jigglypuffed 0 63 50ms 19 Jul 2025 843rd penous 0 63 14ms 2 Aug 2025 843rd YellowDudeIsMe 0 63 14ms 14 Aug 2025 843rd albanian-laundromat 0 63 6ms 22 Aug 2025 843rd snoozingnewt 🇨🇦 0 63 183ms 15 Sep 2025 843rd snoozingnewt 🇨🇦 0 63 6ms 15 Sep 2025 843rd snoozingnewt 🇨🇦 0 63 52ms 15 Sep 2025 843rd luuumine 🇫🇷 0 63 2ms 10 Nov 2025 843rd JOrE20 0 63 6ms 18 Nov 2025 843rd kayaulai 0 63 93ms 23 Nov 2025 879th Shanethegamer 🇺🇸 0 64 142ms 20 Nov 2024 879th error256 0 64 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