The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 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 78th cywong-amino 🇭🇰 956 41 9ms 19 May 2020 78th Attero 🇸🇪 956 41 9ms 22 May 2020 78th Irratix 🇳🇱 956 41 10ms 7 Jul 2020 78th uw4 956 41 10ms 29 Aug 2020 78th JayXon 🇺🇸 956 41 10ms 17 Sep 2020 78th tomtheisen 🇺🇸 956 41 8ms 24 Sep 2020 78th rucin93 🇵🇱 956 41 10ms 7 Oct 2020 78th Argeento 🇵🇱 956 41 10ms 9 Oct 2020 78th HPWiz 🇳🇿 956 41 9ms 12 Oct 2020 78th BBoehm 🇩🇪 956 41 12ms 15 Oct 2020 78th nwellnhof 🇩🇪 956 41 9ms 5 Nov 2020 78th emplv 🇱🇻 956 41 8ms 23 Nov 2020 78th o0lit3 🇺🇸 956 41 9ms 3 Jan 2021 78th madex 🇩🇪 956 41 9ms 18 Jan 2021 78th didion0 🇺🇸 956 41 9ms 10 Feb 2021 78th ScottHamper 956 41 9ms 21 May 2021 78th janbehrens 🇩🇪 956 41 11ms 22 May 2021 78th NewDefectus 🇮🇱 956 41 9ms 27 May 2021 78th Waffle3z 956 41 9ms 14 Jul 2021 78th Lydxn 🇨🇦 956 41 9ms 21 Aug 2021 78th jakzo 956 41 12ms 9 Sep 2021 78th mjamado 956 41 10ms 5 Feb 2022 78th GrayJoKing 🇦🇺 956 41 10ms 9 Feb 2022 78th jared-hughes 956 41 10ms 10 Mar 2022 78th sean-niemann 🇺🇸 956 41 9ms 20 Mar 2022 78th voytxt 🇨🇿 956 41 9ms 7 Apr 2022 78th simon-biber 956 41 9ms 19 May 2022 78th dmrichwa 🇺🇸 956 41 10ms 20 May 2022 78th prplz 🇦🇺 956 41 9ms 22 May 2022 78th MeWhenI 🇻🇦 956 41 12ms 6 Sep 2022 78th makinde 956 41 9ms 18 Oct 2022 78th Steffan153 🇫🇮 956 41 9ms 26 Dec 2022 78th biocommando 🇫🇮 956 41 11ms 26 Dec 2022 78th b10011 🇫🇮 956 41 9ms 8 Jan 2023 78th DialFrost 🇸🇬 956 41 11ms 23 Jan 2023 78th inventshah 956 41 10ms 26 Jan 2023 78th neel11235813 956 41 9ms 14 Feb 2023 78th stefangimmillaro 956 41 12ms 19 Feb 2023 78th xsot 🇸🇬 956 41 9ms 19 Mar 2023 78th ovs-code 🇩🇪 956 41 8ms 29 Sep 2023 78th trinityy-7 956 41 12ms 17 Dec 2023 78th helbling 🇨🇭 956 41 9ms 14 May 2024 78th vlpx 🇫🇮 956 41 9ms 18 Jun 2024 78th pardouin 🇫🇷 956 41 10ms 5 Aug 2024 78th dokutan 956 41 9ms 25 Sep 2024 78th b-illy 🇬🇧 956 41 9ms 28 Sep 2024 78th kirjavascript 956 41 9ms 1 Jun 2025 78th fuzzylojik-golf 🇺🇸 956 41 9ms 28 Jun 2025 78th Nemikolh 🇫🇷 956 41 9ms 15 Jul 2025 78th Yax42 🇫🇷 956 41 9ms 9 Sep 2025 78th qpwoeirut 956 41 8ms 14 Oct 2025 78th Babafaba 956 41 9ms 15 Oct 2025 78th KasperKivimaeki 🇫🇮 956 41 10ms 1 Nov 2025 78th CornerMercury 🇬🇧 956 41 10ms 7 Dec 2025 78th edsrzf 🇳🇿 956 41 9ms 21 Dec 2025 78th snoozingnewt 🇨🇦 956 41 10ms 10 days ago 137th lynn 955 49 115ms 12 Apr 2021 137th HPWiz 🇳🇿 955 49 114ms 17 Apr 2021 137th xnor-gate 955 49 117ms 17 Apr 2021 137th JayXon 🇺🇸 955 49 114ms 17 Apr 2021 137th Lydxn 🇨🇦 955 49 112ms 13 Nov 2021 137th Sakisan 🇧🇪 955 49 120ms 12 Apr 2022 137th ovs-code 🇩🇪 955 49 112ms 11 May 2023 144th acotis 954 56 122ms 24 Sep 2025 144th kumavale 954 56 128ms 27 Sep 2025 146th GrayJoKing 🇦🇺 952 21 39ms 28 Jul 2022 146th betaveros 952 21 37ms 9 Aug 2022 146th ovs-code 🇩🇪 952 21 40ms 12 Jul 2023 146th AlephSquirrel 952 21 40ms 1 Aug 2023 146th Shanethegamer 🇺🇸 952 21 38ms 22 May 2025 151st Lydxn 🇨🇦 952 39 463ms 17 Jan 2024 151st JayXon 🇺🇸 952 39 374ms 18 Jan 2024 153rd JayXon 🇺🇸 951 55 1ms 9 Feb 2022 153rd rhdqor213 951 55 6ms 2 Aug 2024 155th primo-ppcg 🇹🇭 949 33 1,022ms 8 Feb 2022 155th HPWiz 🇳🇿 949 33 1,021ms 8 Mar 2022 157th Lydxn 🇨🇦 948 36 74ms 12 Dec 2022 157th sisyphus-ppcg 🇦🇺 948 36 97ms 12 Dec 2022 157th ovs-code 🇩🇪 948 36 92ms 22 Apr 2024 160th primo-ppcg 🇹🇭 948 42 123ms 2 May 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