The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Quine 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 549th sisyphus-ppcg 🇦🇺 959 21 3ms 10 Dec 2020 549th BBoehm 🇩🇪 959 21 3ms 10 Feb 2021 549th lynn 959 21 3ms 3 Apr 2021 549th JayXon 🇺🇸 959 21 3ms 16 May 2021 549th Natanaelel 🇸🇪 959 21 3ms 28 May 2021 549th mokymok 🇺🇸 959 21 3ms 16 Jun 2021 549th kurkale6ka 959 21 3ms 15 Jul 2021 549th MeWhenI 🇻🇦 959 21 3ms 19 Jul 2021 549th sean-niemann 🇺🇸 959 21 3ms 23 Aug 2021 549th m-tkach 🇺🇦 959 21 3ms 27 Aug 2021 549th theunofficialcoder 959 21 3ms 1 Sep 2021 549th tegenton 959 21 2ms 4 Oct 2021 549th nwellnhof 🇩🇪 959 21 3ms 2 Nov 2021 549th janbehrens 🇩🇪 959 21 3ms 8 Dec 2021 549th SirBogman 🇺🇸 959 21 3ms 15 Dec 2021 549th scpchicken 🇵🇼 959 21 3ms 16 Jan 2022 549th varhammer 959 21 3ms 31 Jan 2022 549th Super-Pizza 🇨🇦 959 21 2ms 6 Apr 2022 549th voytxt 🇨🇿 959 21 3ms 20 May 2022 549th shinh 959 21 3ms 28 Jun 2022 549th saito-ta 🇯🇵 959 21 3ms 28 Jun 2022 549th michael-pruglo 🇺🇦 959 21 3ms 6 Jul 2022 549th Steffan153 🇫🇮 959 21 3ms 23 Sep 2022 549th DialFrost 🇸🇬 959 21 3ms 8 Nov 2022 549th andersk 🇺🇸 959 21 3ms 23 Nov 2022 549th trist224 🇫🇷 959 21 3ms 28 Nov 2022 549th emirps 959 21 3ms 8 Feb 2023 549th neel11235813 959 21 3ms 23 Mar 2023 549th Yewzir 🇧🇪 959 21 3ms 25 May 2023 549th klixel 🇨🇦 959 21 3ms 5 Jun 2023 549th ovs-code 🇩🇪 959 21 3ms 3 Oct 2023 549th byronknoll 🇺🇸 959 21 3ms 18 Jan 2024 549th pardouin 🇫🇷 959 21 2ms 19 Jul 2024 549th LostSyntax21 🇬🇧 959 21 3ms 31 Aug 2024 549th madeforlosers 959 21 3ms 20 Sep 2024 549th CaedenHarper 🇨🇦 959 21 2ms 13 Oct 2024 549th Bobracha 959 21 3ms 28 Dec 2024 549th fuzzylojik-golf 🇺🇸 959 21 3ms 1 Jun 2025 549th xsot 🇸🇬 959 21 3ms 24 Jun 2025 549th dokutan 959 21 3ms 16 Jul 2025 549th snoozingnewt 🇨🇦 959 21 2ms 12 Oct 2025 549th iczelia 🇩🇪 959 21 3ms 14 Oct 2025 549th CornerMercury 🇬🇧 959 21 3ms 8 Dec 2025 549th yoikolover 959 21 3ms 11 Dec 2025 605th sisyphus-ppcg 🇦🇺 957 17 80ms 8 Sep 2021 605th GrayJoKing 🇦🇺 957 17 76ms 24 Nov 2021 605th Shanethegamer 🇺🇸 957 17 79ms 24 Nov 2021 605th Lydxn 🇨🇦 957 17 77ms 24 Nov 2021 605th scpchicken 🇵🇼 957 17 81ms 6 Feb 2022 605th shellbertt 🇨🇦 957 17 81ms 27 Apr 2022 605th MeWhenI 🇻🇦 957 17 76ms 24 Nov 2022 605th sean-niemann 🇺🇸 957 17 75ms 15 Dec 2022 605th DialFrost 🇸🇬 957 17 77ms 4 Jan 2023 605th Steffan153 🇫🇮 957 17 80ms 7 Jan 2023 605th pardouin 🇫🇷 957 17 77ms 21 Aug 2024 605th snoozingnewt 🇨🇦 957 17 80ms 30 Nov 2025 617th ovs-code 🇩🇪 954 14 3ms 13 Jul 2023 617th voytxt 🇨🇿 954 14 3ms 13 Jul 2023 617th Lydxn 🇨🇦 954 14 3ms 13 Jul 2023 617th sisyphus-ppcg 🇦🇺 954 14 3ms 14 Jul 2023 617th MeWhenI 🇻🇦 954 14 3ms 14 Jul 2023 617th Steffan153 🇫🇮 954 14 3ms 15 Jul 2023 617th m-tkach 🇺🇦 954 14 3ms 15 Jul 2023 617th GrayJoKing 🇦🇺 954 14 3ms 16 Jul 2023 617th 4hg 🇺🇸 954 14 3ms 20 Jul 2023 617th typeswitch-dev 🇵🇹 954 14 3ms 26 Jul 2023 617th AlephSquirrel 954 14 3ms 29 Jul 2023 617th DialFrost 🇸🇬 954 14 3ms 24 Aug 2023 617th neel11235813 954 14 3ms 2 Oct 2023 617th HumanoidCPU 954 14 3ms 12 May 2024 617th pardouin 🇫🇷 954 14 3ms 23 Jul 2024 617th Quirkly-Quasar1 🇺🇸 954 14 3ms 4 Dec 2024 617th CaedenHarper 🇨🇦 954 14 3ms 20 Jan 2025 617th edsrzf 🇳🇿 954 14 3ms 16 Mar 2025 617th fuzzylojik-golf 🇺🇸 954 14 3ms 5 May 2025 617th sean-niemann 🇺🇸 954 14 3ms 19 May 2025 617th JOrE-Softwares 954 14 3ms 6 Jun 2025 617th snoozingnewt 🇨🇦 954 14 3ms 31 Oct 2025 617th JOrE20 954 14 3ms 7 Nov 2025 617th albanian-laundromat 954 14 3ms 9 Dec 2025 First Prev 561–640 of 5,781 Next Last
