The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 20 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 783rd voytxt 🇨🇿 0 61 5ms 25 Jan 2025 783rd m-tkach 🇺🇦 0 61 13ms 30 Jan 2025 783rd Natanaelel 🇸🇪 0 61 13ms 2 Feb 2025 783rd CaedenHarper 🇨🇦 0 61 12ms 3 Feb 2025 783rd BalaM314 0 61 12ms 4 Feb 2025 783rd kg583 🇺🇸 0 61 77ms 5 Feb 2025 783rd GolfingSuccess 🇬🇷 0 61 69ms 5 Feb 2025 783rd targrik 0 61 12ms 8 Feb 2025 783rd MeWhenI 🇻🇦 0 61 3ms 14 Feb 2025 783rd targrik 0 61 3ms 15 Feb 2025 783rd attila8192 0 61 14ms 1 Mar 2025 783rd targrik 0 61 2ms 14 Mar 2025 783rd janlelis 0 61 13ms 31 Mar 2025 783rd b-illy 🇬🇧 0 61 13ms 16 Apr 2025 783rd janbehrens 🇩🇪 0 61 13ms 17 Apr 2025 783rd pardouin 🇫🇷 0 61 13ms 17 Apr 2025 783rd Shanethegamer 🇺🇸 0 61 81ms 17 Apr 2025 783rd edsrzf 🇳🇿 0 61 13ms 17 Apr 2025 783rd HumanoidCPU 0 61 76ms 18 Apr 2025 783rd HumanoidCPU 0 61 12ms 18 Apr 2025 783rd AlephSquirrel 0 61 13ms 20 Apr 2025 783rd Sam-Vrgl 0 61 14ms 13 May 2025 783rd c-py 0 61 12ms 14 May 2025 783rd albanian-laundromat 0 61 76ms 6 Jun 2025 783rd Andrey-Plotnikov 0 61 13ms 19 Jun 2025 783rd a6166231 🇨🇳 0 61 13ms 20 Jun 2025 783rd elana-teal 0 61 11ms 20 Jun 2025 783rd BREMAUCY 🇫🇷 0 61 12ms 1 Jul 2025 783rd RYSF13 🇨🇳 0 61 12ms 5 Jul 2025 783rd p01 0 61 13ms 28 Jul 2025 783rd KrausRaus 🇺🇸 0 61 14ms 29 Jul 2025 783rd dmrichwa 🇺🇸 0 61 14ms 29 Jul 2025 783rd dokutan 0 61 2ms 5 Aug 2025 783rd gitchaell 🇧🇴 0 61 13ms 6 Aug 2025 783rd lukepolak 0 61 14ms 7 Aug 2025 783rd adrianbgo 0 61 13ms 7 Aug 2025 783rd helbling 🇨🇭 0 61 14ms 28 Aug 2025 783rd snoozingnewt 🇨🇦 0 61 75ms 15 Sep 2025 783rd snoozingnewt 🇨🇦 0 61 12ms 15 Sep 2025 783rd larsendaniel 0 61 12ms 7 Nov 2025 783rd JOrE20 0 61 12ms 18 Nov 2025 783rd GodlyProgrammer1 0 61 13ms 22 Nov 2025 783rd Kacarott 🇦🇺 0 61 104ms 25 Nov 2025 783rd egertaia 0 61 13ms 9 Jan 2026 783rd r58iiz 0 61 12ms 15 Jan 2026 783rd ragonscreen 0 61 12ms 16 Jan 2026 783rd matzuka 0 61 39ms 29 Jan 2026 783rd FoxInTheClouds 0 61 13ms 5 Feb 2026 783rd Ultra814 0 61 12ms 19 Feb 2026 783rd weliveinhell 🇭🇹 0 61 12ms 18 days ago 783rd marcuswilcour 0 61 12ms 5 days ago 852nd emgordon154 0 62 2ms 27 Nov 2024 852nd CLOStrophobic 🇮🇹 0 62 3ms 4 Feb 2025 852nd DialFrost 🇸🇬 0 62 11ms 15 Feb 2025 852nd heanyang1 0 62 14ms 26 Mar 2025 852nd dokutan 0 62 2,017ms 15 Jul 2025 852nd 6512345 0 62 161ms 4 Nov 2025 858th kg583 🇺🇸 0 63 49ms 21 Nov 2024 858th sean-niemann 🇺🇸 0 63 162ms 10 Dec 2024 858th MeWhenI 🇻🇦 0 63 6ms 18 Dec 2024 858th zacjl 0 63 52ms 31 Dec 2024 858th CLOStrophobic 🇮🇹 0 63 58ms 17 Jan 2025 858th edsrzf 🇳🇿 0 63 50ms 9 Feb 2025 858th GolfingSuccess 🇬🇷 0 63 49ms 9 Feb 2025 858th Nemikolh 🇫🇷 0 63 13ms 12 Feb 2025 858th GolfingSuccess 🇬🇷 0 63 189ms 20 Feb 2025 858th varhammer 0 63 6ms 22 Feb 2025 858th voytxt 🇨🇿 0 63 189ms 17 Apr 2025 858th FlyingPenguin223 0 63 51ms 17 Apr 2025 858th DialFrost 🇸🇬 0 63 185ms 17 Apr 2025 858th DialFrost 🇸🇬 0 63 5ms 17 Apr 2025 858th DialFrost 🇸🇬 0 63 49ms 17 Apr 2025 858th pardouin 🇫🇷 0 63 176ms 17 Apr 2025 858th Shanethegamer 🇺🇸 0 63 5ms 17 Apr 2025 858th Shanethegamer 🇺🇸 0 63 54ms 17 Apr 2025 858th GolfingSuccess 🇬🇷 0 63 6ms 17 Apr 2025 858th HumanoidCPU 0 63 177ms 18 Apr 2025 858th HumanoidCPU 0 63 7ms 18 Apr 2025 858th HumanoidCPU 0 63 50ms 18 Apr 2025 858th CaedenHarper 🇨🇦 0 63 163ms 18 Apr 2025 First Prev 801–880 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