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 875th HumanoidCPU 877 81 59ms 19 Feb 2024 882nd Steffan153 🇫🇮 875 39 72ms 26 Dec 2022 882nd Alessandro-Balconi 🇮🇹 875 39 80ms 26 Dec 2022 884th Yewzir 🇧🇪 875 55 3ms 29 Mar 2024 885th somebody1234 874 26 109ms 5 Dec 2018 885th AlexDaniel 🇪🇪 874 26 112ms 5 Apr 2020 887th 4hg 🇺🇸 874 45 63ms 13 Sep 2023 887th chunes3 🇺🇸 874 45 68ms 13 Sep 2023 887th Bubbler-4 874 45 67ms 13 Sep 2023 887th GolfingSuccess 🇬🇷 874 45 65ms 28 Sep 2023 887th Lydxn 🇨🇦 874 45 71ms 28 Sep 2023 887th Yewzir 🇧🇪 874 45 70ms 5 Mar 2024 893rd TeodorDyakov 🇧🇬 874 69 416ms 19 Jan 2026 894th nwellnhof 🇩🇪 874 88 277ms 3 Sep 2020 894th MeWhenI 🇻🇦 874 88 273ms 9 Feb 2023 894th sean-niemann 🇺🇸 874 88 292ms 17 Jun 2023 894th fuzzylojik-golf 🇺🇸 874 88 272ms 15 Jul 2025 898th Yewzir 🇧🇪 872 43 1ms 19 Nov 2025 899th stefangimmillaro 872 47 2,702ms 25 Oct 2024 899th ScottHamper 872 47 2,552ms 25 Oct 2024 899th janlelis 872 47 2,500ms 25 Apr 2025 902nd MeWhenI 🇻🇦 872 53 3ms 22 May 2023 903rd retrohun 872 60 1ms 11 May 2019 903rd marcin7Cd 872 60 1ms 17 May 2020 903rd nexaitch 872 60 1ms 10 Jul 2020 903rd lukasmoellerch 872 60 1ms 15 Mar 2021 903rd djeedjay 🇳🇱 872 60 2ms 6 Sep 2021 903rd Bubbler-4 872 60 1ms 16 Nov 2021 903rd emgordon154 872 60 1ms 2 Dec 2021 903rd ZakkkkAttackkkk 🇵🇭 872 60 1ms 17 Dec 2021 903rd GolfingSuccess 🇬🇷 872 60 1ms 16 Jan 2022 903rd nai62 872 60 1ms 28 Aug 2022 903rd m-tkach 🇺🇦 872 60 1ms 24 Oct 2022 903rd speles 🇺🇦 872 60 1ms 29 Oct 2023 903rd elgan65536 🇺🇸 872 60 2ms 11 Nov 2023 903rd klixel 🇨🇦 872 60 1ms 17 Nov 2023 903rd NDR0216 🇹🇼 872 60 2ms 9 May 2024 903rd mttcrn 872 60 2ms 25 Mar 2025 903rd Shanethegamer 🇺🇸 872 60 1ms 28 May 2025 903rd csharpython 872 60 2ms 23 Jul 2025 903rd warmCabin 872 60 2ms 31 Dec 2025 903rd TeodorDyakov 🇧🇬 872 60 2ms 13 Jan 2026 903rd bac0id 872 60 2ms 27 Jan 2026 924th Steffan153 🇫🇮 872 71 28ms 11 hours ago 925th MeWhenI 🇻🇦 871 44 136ms 3 Aug 2024 925th GrayJoKing 🇦🇺 871 44 146ms 3 Aug 2024 925th DialFrost 🇸🇬 871 44 129ms 8 Aug 2024 925th rucin93 🇵🇱 871 44 137ms 9 Aug 2024 929th ANDREYDEN 871 45 10ms 12 Jan 2019 929th dee-gomma 871 45 10ms 27 Mar 2019 929th Cr3aHal0 871 45 9ms 2 Jul 2019 929th StefanTifrea 871 45 9ms 15 Jul 2020 929th Non-J 871 45 9ms 27 Sep 2020 929th ryandougc 871 45 9ms 17 Dec 2020 929th ForkKILLET 🇨🇳 871 45 9ms 18 Feb 2021 929th UBKorkut 871 45 9ms 10 Mar 2021 929th neihousaigaai 871 45 11ms 8 May 2021 929th SpareManiKatti 871 45 9ms 14 Oct 2021 929th danielb7390 871 45 9ms 9 Mar 2022 929th WebDevPT 🇵🇹 871 45 9ms 10 Mar 2022 929th CiucaRazvan 871 45 9ms 29 Jul 2022 929th SirFireball3521 871 45 9ms 1 Nov 2022 929th astdefu 871 45 9ms 10 Dec 2022 929th Betuaredead 871 45 10ms 4 Jan 2023 929th Mazn3k 871 45 10ms 15 Mar 2023 929th ejini6969 871 45 13ms 25 Mar 2023 929th raszpi 🇭🇺 871 45 9ms 2 Sep 2023 929th mulmul9 🇭🇺 871 45 8ms 7 Sep 2023 929th FruzsinaLenti 871 45 9ms 8 Sep 2023 929th junkondo-jp 871 45 9ms 6 May 2024 929th Mabeloid 🇳🇴 871 45 9ms 14 Oct 2024 929th shandriy 871 45 9ms 8 Nov 2024 929th Salutations45 871 45 9ms 12 Nov 2024 929th 823126 871 45 10ms 9 Dec 2024 929th Garklein 🇨🇦 871 45 9ms 6 Jan 2025 929th jake6192 871 45 9ms 17 May 2025 929th albanian-laundromat 871 45 13ms 1 Sep 2025 929th iczelia 🇩🇪 871 45 8ms 25 Sep 2025 959th GolfingSuccess 🇬🇷 870 23 38ms 14 Aug 2022 959th primo-ppcg 🇹🇭 870 23 42ms 15 Feb 2023 First Prev 881–960 of 4,842 Next Last