The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Leap Years 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 876th Herbert00709 🇵🇱 877 81 67ms 17 Nov 2023 876th HumanoidCPU 877 81 59ms 19 Feb 2024 883rd Steffan153 🇫🇮 875 39 72ms 26 Dec 2022 883rd Alessandro-Balconi 🇮🇹 875 39 80ms 26 Dec 2022 885th Yewzir 🇧🇪 875 55 3ms 29 Mar 2024 886th somebody1234 874 26 109ms 5 Dec 2018 886th AlexDaniel 🇪🇪 874 26 112ms 5 Apr 2020 888th 4hg 🇺🇸 874 45 63ms 13 Sep 2023 888th chunes3 🇺🇸 874 45 68ms 13 Sep 2023 888th Bubbler-4 874 45 67ms 13 Sep 2023 888th GolfingSuccess 🇬🇷 874 45 65ms 28 Sep 2023 888th Lydxn 🇨🇦 874 45 71ms 28 Sep 2023 888th Yewzir 🇧🇪 874 45 70ms 5 Mar 2024 894th TeodorDyakov 🇧🇬 874 69 416ms 19 Jan 2026 895th nwellnhof 🇩🇪 874 88 277ms 3 Sep 2020 895th MeWhenI 🇻🇦 874 88 273ms 9 Feb 2023 895th sean-niemann 🇺🇸 874 88 292ms 17 Jun 2023 895th fuzzylojik-golf 🇺🇸 874 88 272ms 15 Jul 2025 899th Yewzir 🇧🇪 872 43 1ms 19 Nov 2025 900th stefangimmillaro 872 47 2,702ms 25 Oct 2024 900th ScottHamper 872 47 2,552ms 25 Oct 2024 900th janlelis 872 47 2,500ms 25 Apr 2025 903rd MeWhenI 🇻🇦 872 53 3ms 22 May 2023 904th retrohun 872 60 1ms 11 May 2019 904th marcin7Cd 872 60 1ms 17 May 2020 904th nexaitch 872 60 1ms 10 Jul 2020 904th lukasmoellerch 872 60 1ms 15 Mar 2021 904th djeedjay 🇳🇱 872 60 2ms 6 Sep 2021 904th Bubbler-4 872 60 1ms 16 Nov 2021 904th emgordon154 872 60 1ms 2 Dec 2021 904th ZakkkkAttackkkk 🇵🇭 872 60 1ms 17 Dec 2021 904th GolfingSuccess 🇬🇷 872 60 1ms 16 Jan 2022 904th nai62 872 60 1ms 28 Aug 2022 904th m-tkach 🇺🇦 872 60 1ms 24 Oct 2022 904th speles 🇺🇦 872 60 1ms 29 Oct 2023 904th elgan65536 🇺🇸 872 60 2ms 11 Nov 2023 904th klixel 🇨🇦 872 60 1ms 17 Nov 2023 904th NDR0216 🇹🇼 872 60 2ms 9 May 2024 904th mttcrn 872 60 2ms 25 Mar 2025 904th Shanethegamer 🇺🇸 872 60 1ms 28 May 2025 904th csharpython 872 60 2ms 23 Jul 2025 904th warmCabin 872 60 2ms 31 Dec 2025 904th TeodorDyakov 🇧🇬 872 60 2ms 13 Jan 2026 904th bac0id 872 60 2ms 27 Jan 2026 925th Steffan153 🇫🇮 872 71 28ms 21 hours ago 926th MeWhenI 🇻🇦 871 44 136ms 3 Aug 2024 926th GrayJoKing 🇦🇺 871 44 146ms 3 Aug 2024 926th DialFrost 🇸🇬 871 44 129ms 8 Aug 2024 926th rucin93 🇵🇱 871 44 137ms 9 Aug 2024 930th ANDREYDEN 871 45 10ms 12 Jan 2019 930th dee-gomma 871 45 10ms 27 Mar 2019 930th Cr3aHal0 871 45 9ms 2 Jul 2019 930th StefanTifrea 871 45 9ms 15 Jul 2020 930th Non-J 871 45 9ms 27 Sep 2020 930th ryandougc 871 45 9ms 17 Dec 2020 930th ForkKILLET 🇨🇳 871 45 9ms 18 Feb 2021 930th UBKorkut 871 45 9ms 10 Mar 2021 930th neihousaigaai 871 45 11ms 8 May 2021 930th SpareManiKatti 871 45 9ms 14 Oct 2021 930th danielb7390 871 45 9ms 9 Mar 2022 930th WebDevPT 🇵🇹 871 45 9ms 10 Mar 2022 930th CiucaRazvan 871 45 9ms 29 Jul 2022 930th SirFireball3521 871 45 9ms 1 Nov 2022 930th astdefu 871 45 9ms 10 Dec 2022 930th Betuaredead 871 45 10ms 4 Jan 2023 930th Mazn3k 871 45 10ms 15 Mar 2023 930th ejini6969 871 45 13ms 25 Mar 2023 930th raszpi 🇭🇺 871 45 9ms 2 Sep 2023 930th mulmul9 🇭🇺 871 45 8ms 7 Sep 2023 930th FruzsinaLenti 871 45 9ms 8 Sep 2023 930th junkondo-jp 871 45 9ms 6 May 2024 930th Mabeloid 🇳🇴 871 45 9ms 14 Oct 2024 930th shandriy 871 45 9ms 8 Nov 2024 930th Salutations45 871 45 9ms 12 Nov 2024 930th 823126 871 45 10ms 9 Dec 2024 930th Garklein 🇨🇦 871 45 9ms 6 Jan 2025 930th jake6192 871 45 9ms 17 May 2025 930th albanian-laundromat 871 45 13ms 1 Sep 2025 930th iczelia 🇩🇪 871 45 8ms 25 Sep 2025 960th GolfingSuccess 🇬🇷 870 23 38ms 14 Aug 2022 First Prev 881–960 of 4,843 Next Last