The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Pernicious Numbers 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 390th dokutan 937 38 95ms 28 Jul 2024 390th pardouin 🇫🇷 937 38 103ms 20 Aug 2024 390th primo-ppcg 🇹🇭 937 38 100ms 12 Apr 2025 390th edsrzf 🇳🇿 937 38 93ms 22 Jul 2025 390th fuzzylojik-golf 🇺🇸 937 38 113ms 7 Aug 2025 390th snoozingnewt 🇨🇦 937 38 95ms 20 Oct 2025 390th GolfingSuccess 🇬🇷 937 38 96ms 15 days ago 408th GrayJoKing 🇦🇺 937 41 1ms 9 Feb 2021 408th primo-ppcg 🇹🇭 937 41 1ms 9 Feb 2021 408th JayXon 🇺🇸 937 41 1ms 9 Feb 2021 408th prplz 🇦🇺 937 41 1ms 10 Feb 2021 408th sisyphus-ppcg 🇦🇺 937 41 1ms 10 Feb 2021 408th Waffle3z 937 41 1ms 10 Feb 2021 408th orthoplex 🇨🇽 937 41 1ms 12 Aug 2021 408th jared-hughes 937 41 1ms 28 Feb 2022 408th m-tkach 🇺🇦 937 41 1ms 24 Oct 2022 408th MeWhenI 🇻🇦 937 41 1ms 5 Nov 2022 408th DialFrost 🇸🇬 937 41 2ms 12 Jan 2023 408th sean-niemann 🇺🇸 937 41 1ms 12 Jan 2023 408th Shanethegamer 🇺🇸 937 41 1ms 6 Feb 2023 408th xsot 🇸🇬 937 41 1ms 9 Oct 2023 408th dokutan 937 41 1ms 26 Mar 2024 408th pardouin 🇫🇷 937 41 2ms 21 Sep 2024 408th FlyingPenguin223 937 41 2ms 23 Oct 2024 408th fuzzylojik-golf 🇺🇸 937 41 1ms 3 Jul 2025 408th edsrzf 🇳🇿 937 41 1ms 22 Jul 2025 408th snoozingnewt 🇨🇦 937 41 1ms 3 Dec 2025 408th Steffan153 🇫🇮 937 41 2ms 11 Feb 2026 408th GolfingSuccess 🇬🇷 937 41 2ms 15 days ago 430th Lydxn 🇨🇦 935 34 4ms 12 May 2023 430th Steffan153 🇫🇮 935 34 4ms 14 May 2023 430th sean-niemann 🇺🇸 935 34 4ms 21 Apr 2025 433rd henkma 935 51 111ms 26 Jun 2020 433rd lynn 935 51 113ms 8 Oct 2021 435th prplz 🇦🇺 935 55 114ms 13 Jan 2022 435th GrayJoKing 🇦🇺 935 55 121ms 13 Jan 2022 435th JayXon 🇺🇸 935 55 115ms 13 Jan 2022 435th Lydxn 🇨🇦 935 55 120ms 13 Jan 2022 435th primo-ppcg 🇹🇭 935 55 132ms 14 Jan 2022 435th lynn 935 55 113ms 10 Mar 2022 435th inventshah 935 55 115ms 15 Jun 2022 435th sisyphus-ppcg 🇦🇺 935 55 125ms 8 Aug 2022 435th sean-niemann 🇺🇸 935 55 125ms 3 Nov 2022 435th stefangimmillaro 935 55 130ms 4 Nov 2022 435th andersk 🇺🇸 935 55 124ms 5 Nov 2022 435th MeWhenI 🇻🇦 935 55 119ms 6 Nov 2022 435th Steffan153 🇫🇮 935 55 127ms 27 Nov 2022 435th DialFrost 🇸🇬 935 55 133ms 12 Jan 2023 435th rucin93 🇵🇱 935 55 123ms 19 Jan 2023 435th Shanethegamer 🇺🇸 935 55 121ms 6 Feb 2023 435th ovs-code 🇩🇪 935 55 118ms 17 Jul 2023 435th Yewzir 🇧🇪 935 55 122ms 11 Oct 2023 435th Betuaredead 935 55 117ms 11 Nov 2023 435th dokutan 935 55 132ms 27 Mar 2024 435th pardouin 🇫🇷 935 55 115ms 19 Aug 2024 435th acotis 935 55 141ms 4 Feb 2025 435th emgordon154 935 55 119ms 19 Mar 2025 435th fuzzylojik-golf 🇺🇸 935 55 125ms 17 Jun 2025 435th edsrzf 🇳🇿 935 55 124ms 22 Jul 2025 435th kumavale 935 55 130ms 26 Aug 2025 435th snoozingnewt 🇨🇦 935 55 118ms 20 Oct 2025 435th GolfingSuccess 🇬🇷 935 55 116ms 15 days ago 463rd Yewzir 🇧🇪 934 33 1ms 18 Nov 2025 463rd sean-niemann 🇺🇸 934 33 1ms 18 Nov 2025 463rd rucin93 🇵🇱 934 33 1ms 18 Nov 2025 463rd edsrzf 🇳🇿 934 33 1ms 18 Nov 2025 463rd DialFrost 🇸🇬 934 33 1ms 19 Nov 2025 463rd JayXon 🇺🇸 934 33 1ms 19 Nov 2025 463rd GrayJoKing 🇦🇺 934 33 1ms 19 Nov 2025 463rd pardouin 🇫🇷 934 33 1ms 19 Nov 2025 463rd snoozingnewt 🇨🇦 934 33 1ms 3 Dec 2025 463rd Steffan153 🇫🇮 934 33 1ms 13 Feb 2026 463rd GolfingSuccess 🇬🇷 934 33 2ms 15 days ago 474th GrayJoKing 🇦🇺 934 48 1ms 9 Feb 2021 474th prplz 🇦🇺 934 48 1ms 10 Feb 2021 474th NewDefectus 🇮🇱 934 48 1ms 8 May 2021 474th orthoplex 🇨🇽 934 48 1ms 12 Aug 2021 474th akshatj27 🇦🇶 934 48 1ms 11 Jan 2022 474th lynn 934 48 1ms 3 Jun 2022 474th AlephSquirrel 934 48 1ms 18 Jul 2022 First Prev 401–480 of 3,434 Next Last