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?
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 619th JOrE20 954 14 3ms 7 Nov 2025 619th albanian-laundromat 954 14 3ms 9 Dec 2025 643rd sisyphus-ppcg 🇦🇺 950 17 270ms 15 Jan 2022 643rd dcgjb 950 17 247ms 11 Jan 2024 643rd jborean93 950 17 268ms 6 May 2024 643rd IISResetMe 950 17 251ms 6 May 2024 643rd corbob 🇨🇦 950 17 226ms 6 May 2024 643rd indented-automation 950 17 254ms 7 May 2024 643rd JPRuskin 🇬🇧 950 17 268ms 7 May 2024 643rd Feniske 🇫🇷 950 17 261ms 14 May 2024 643rd MaxCastella 🇫🇷 950 17 249ms 30 May 2024 643rd sean-niemann 🇺🇸 950 17 297ms 7 Apr 2025 653rd somebody1234 948 26 5ms 23 Mar 2018 653rd thospel 948 26 5ms 15 Apr 2018 653rd stassats 948 26 5ms 28 Apr 2018 653rd cam-lambda 948 26 4ms 30 Apr 2018 653rd Deepztream 948 26 5ms 2 Sep 2018 653rd primo-ppcg 🇹🇭 948 26 5ms 19 Oct 2018 653rd prplz 🇦🇺 948 26 4ms 20 Nov 2018 653rd rambox11 948 26 4ms 30 Jan 2019 653rd villfa 948 26 4ms 27 May 2019 653rd Lydxn 🇨🇦 948 26 5ms 18 Jun 2019 653rd AgathokakologicalBit 948 26 4ms 14 Jul 2019 653rd TFeld00 🇩🇰 948 26 4ms 7 Aug 2019 653rd andersk 🇺🇸 948 26 4ms 19 Mar 2020 653rd alexjlaberge 948 26 4ms 27 Jul 2020 653rd itiievskyi 🇺🇦 948 26 4ms 19 Aug 2020 653rd o0lit3 🇺🇸 948 26 5ms 2 Oct 2020 653rd orthoplex 🇨🇽 948 26 5ms 4 Oct 2020 653rd GrayJoKing 🇦🇺 948 26 4ms 20 Oct 2020 653rd rucin93 🇵🇱 948 26 5ms 13 Nov 2020 653rd sisyphus-ppcg 🇦🇺 948 26 5ms 24 Dec 2020 653rd janbehrens 🇩🇪 948 26 5ms 3 Jan 2021 653rd marcin7Cd 948 26 5ms 27 Jan 2021 653rd Shanethegamer 🇺🇸 948 26 5ms 27 Jan 2021 653rd SnowballSH 948 26 5ms 28 Jan 2021 653rd BBoehm 🇩🇪 948 26 4ms 10 Feb 2021 653rd JayXon 🇺🇸 948 26 4ms 14 Apr 2021 653rd MeWhenI 🇻🇦 948 26 4ms 1 May 2021 653rd KatieLG 🇬🇧 948 26 5ms 25 May 2021 653rd RYNO8 948 26 4ms 8 Aug 2021 653rd madex 🇩🇪 948 26 4ms 29 Aug 2021 653rd olivermrose 🇺🇸 948 26 5ms 31 Aug 2021 653rd ai-fischer 948 26 5ms 2 Oct 2021 653rd tegenton 948 26 4ms 4 Oct 2021 653rd ozefe 🇹🇷 948 26 4ms 28 Oct 2021 653rd shellbertt 🇨🇦 948 26 4ms 3 Nov 2021 653rd two-bad 🇬🇧 948 26 4ms 5 Dec 2021 653rd SirBogman 🇺🇸 948 26 5ms 15 Dec 2021 653rd scpchicken 🇵🇼 948 26 5ms 12 Jan 2022 653rd voytxt 🇨🇿 948 26 5ms 17 Mar 2022 653rd m-tkach 🇺🇦 948 26 5ms 18 May 2022 653rd lynn 948 26 5ms 24 May 2022 653rd solmyr2000 948 26 4ms 15 Jun 2022 653rd yzhs 🇩🇪 948 26 5ms 23 Jun 2022 653rd michael-pruglo 🇺🇦 948 26 5ms 6 Jul 2022 653rd Steffan153 🇫🇮 948 26 4ms 25 Sep 2022 653rd 4hg 🇺🇸 948 26 4ms 17 Oct 2022 653rd DialFrost 🇸🇬 948 26 4ms 8 Nov 2022 653rd DaCuteRaccoon 948 26 5ms 1 Dec 2022 653rd MCausc78 🇺🇦 948 26 5ms 5 Jan 2023 653rd AlephSquirrel 948 26 5ms 21 Jan 2023 653rd ovs-code 🇩🇪 948 26 5ms 25 Jan 2023 653rd neel11235813 948 26 4ms 13 Mar 2023 653rd Dominoscompute 948 26 5ms 20 Apr 2023 653rd Yewzir 🇧🇪 948 26 4ms 26 May 2023 653rd StHagel 948 26 5ms 3 Aug 2023 653rd ndren 948 26 4ms 6 Aug 2023 653rd Siri-chan 948 26 4ms 17 Aug 2023 653rd stackofbears 948 26 5ms 10 Sep 2023 653rd snoozingnewt 🇨🇦 948 26 5ms 15 Sep 2023 653rd madeforlosers 948 26 5ms 5 Apr 2024 653rd pardouin 🇫🇷 948 26 4ms 19 Jul 2024 653rd CaedenHarper 🇨🇦 948 26 5ms 5 Aug 2024 653rd kg583 🇺🇸 948 26 4ms 10 Sep 2024 653rd duckyluuk 🇳🇱 948 26 5ms 19 Sep 2024 653rd xsot 🇸🇬 948 26 5ms 5 Oct 2024 653rd edsrzf 🇳🇿 948 26 4ms 23 Oct 2024 653rd dokutan 948 26 5ms 30 Oct 2024 653rd FlyingPenguin223 948 26 4ms 27 Nov 2024 First Prev 641–720 of 5,783 Next Last
