The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 559th cywong-amino 🇭🇰 902 58 1ms 30 May 2020 559th NewDefectus 🇮🇱 902 58 2ms 27 May 2021 559th tsunderu 🇯🇵 902 58 1ms 2 Sep 2021 559th GrayJoKing 🇦🇺 902 58 1ms 9 Feb 2022 559th voytxt 🇨🇿 902 58 1ms 7 Apr 2022 559th emplv 🇱🇻 902 58 1ms 28 Apr 2022 559th prplz 🇦🇺 902 58 1ms 22 May 2022 559th jared-hughes 902 58 1ms 24 Jun 2022 559th MeWhenI 🇻🇦 902 58 1ms 6 Sep 2022 559th Alex-x90 🇺🇸 902 58 1ms 24 Nov 2022 559th ovs-code 🇩🇪 902 58 1ms 5 Feb 2023 559th rucin93 🇵🇱 902 58 2ms 21 Jun 2023 559th stefangimmillaro 902 58 1ms 4 Aug 2023 559th ListeriaM 902 58 1ms 24 Aug 2023 559th ApoChagi 902 58 1ms 14 Oct 2025 559th Babafaba 902 58 1ms 15 Oct 2025 559th FoxInTheClouds 902 58 2ms 18 Feb 2026 578th Shanethegamer 🇺🇸 902 61 41ms 13 Feb 2025 578th edsrzf 🇳🇿 902 61 41ms 19 Aug 2025 578th Steffan153 🇫🇮 902 61 40ms 12 Feb 2026 581st tjtnorton 901 47 16ms 28 Mar 2019 581st daedals 901 47 19ms 21 Apr 2019 581st handisb 901 47 17ms 5 Sep 2019 581st andersk 🇺🇸 901 47 16ms 20 Mar 2020 581st Attero 🇸🇪 901 47 9ms 9 May 2020 581st neihousaigaai 901 47 16ms 8 May 2021 581st Waffle3z 901 47 16ms 14 Jul 2021 581st janbehrens 🇩🇪 901 47 16ms 21 Oct 2021 581st annaproxy 901 47 16ms 13 Dec 2021 581st pxeger 🇬🇧 901 47 15ms 16 Feb 2022 581st sisyphus-ppcg 🇦🇺 901 47 17ms 19 Feb 2022 581st shellbertt 🇨🇦 901 47 15ms 2 May 2022 581st mrnomm 901 47 16ms 24 Aug 2022 581st jumelet 🇳🇱 901 47 16ms 23 Dec 2022 581st thatbirdguythatuknownot 901 47 20ms 3 Jan 2023 581st MichalMarsalek 🇨🇿 901 47 10ms 23 Feb 2023 581st AlexanderFair 901 47 17ms 15 Jun 2023 581st inventshah 901 47 21ms 18 Jul 2023 581st ListeriaM 901 47 19ms 24 Aug 2023 581st bizy-coder 901 47 18ms 2 Feb 2024 581st BREMAUCY 🇫🇷 901 47 21ms 25 Mar 2024 581st Bulmenisaurus 901 47 19ms 4 Aug 2024 581st voytxt 🇨🇿 901 47 16ms 20 Sep 2024 581st dokutan 901 47 10ms 25 Sep 2024 581st lifthrasiir 🇰🇷 901 47 17ms 20 Nov 2024 581st plcc0 901 47 10ms 6 Mar 2025 581st jipsong 🇩🇪 901 47 10ms 1 Apr 2025 581st KasperKivimaeki 🇫🇮 901 47 15ms 14 May 2025 581st keelimeguy 🇺🇸 901 47 20ms 16 May 2025 581st Flekay 🇩🇪 901 47 16ms 9 Aug 2025 581st janlelis 901 47 16ms 14 Aug 2025 581st snoozingnewt 🇨🇦 901 47 16ms 26 Sep 2025 581st Emutis 🇱🇹 901 47 19ms 25 Oct 2025 581st CommandLeo 🇮🇹 901 47 17ms 30 Nov 2025 581st Lv0Sys 🇵🇱 901 47 16ms 2 Dec 2025 616th Steffan153 🇫🇮 901 53 7ms 4 days ago 617th neel11235813 900 51 1,349ms 4 Jan 2023 617th MeWhenI 🇻🇦 900 51 1,349ms 8 Jun 2023 617th dokutan 900 51 1,286ms 14 Oct 2024 617th DialFrost 🇸🇬 900 51 1,281ms 9 Mar 2025 617th sean-niemann 🇺🇸 900 51 1,333ms 18 Apr 2025 617th fuzzylojik-golf 🇺🇸 900 51 1,359ms 2 Sep 2025 623rd arjanadriaanse 🇳🇱 900 52 121ms 1 Jan 2022 624th DialFrost 🇸🇬 900 67 449ms 24 Sep 2025 624th nwellnhof 🇩🇪 900 67 540ms 25 Sep 2025 624th namelessiw 900 67 455ms 4 Oct 2025 624th stefangimmillaro 900 67 440ms 6 Oct 2025 624th b-illy 🇬🇧 900 67 547ms 9 Oct 2025 624th MeWhenI 🇻🇦 900 67 479ms 7 Nov 2025 624th dokutan 900 67 484ms 30 Nov 2025 624th edsrzf 🇳🇿 900 67 424ms 21 Dec 2025 624th fuzzylojik-golf 🇺🇸 900 67 397ms 27 mins ago 633rd Shanethegamer 🇺🇸 900 79 59ms 12 Jan 2022 633rd Yewzir 🇧🇪 900 79 57ms 9 Dec 2023 633rd oceko 900 79 58ms 19 Feb 2024 633rd CaedenHarper 🇨🇦 900 79 62ms 1 Feb 2025 633rd yanjs 900 79 480ms 10 Jul 2025 633rd AutumnWind75 900 79 446ms 10 Dec 2025 633rd bac0id 900 79 110ms 27 Jan 2026 640th retrohun 899 46 1ms 16 Jun 2024 First Prev 561–640 of 4,851 Next Last