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 556th Irratix 🇳🇱 933 67 59ms 22 Mar 2022 556th inventshah 933 67 63ms 15 Jun 2022 556th sean-niemann 🇺🇸 933 67 61ms 4 Nov 2022 556th MeWhenI 🇻🇦 933 67 63ms 5 Nov 2022 556th Steffan153 🇫🇮 933 67 69ms 27 Nov 2022 556th DialFrost 🇸🇬 933 67 64ms 12 Jan 2023 556th Shanethegamer 🇺🇸 933 67 68ms 6 Feb 2023 556th Alex-x90 🇺🇸 933 67 63ms 24 Feb 2023 556th sisyphus-ppcg 🇦🇺 933 67 66ms 23 Mar 2023 556th rucin93 🇵🇱 933 67 61ms 20 Jun 2023 556th xsot 🇸🇬 933 67 61ms 14 Jul 2023 556th ovs-code 🇩🇪 933 67 62ms 17 Jul 2023 556th Yewzir 🇧🇪 933 67 61ms 11 Oct 2023 556th Betuaredead 933 67 63ms 11 Nov 2023 556th pardouin 🇫🇷 933 67 56ms 17 Aug 2024 556th b-illy 🇬🇧 933 67 58ms 5 Jun 2025 556th fuzzylojik-golf 🇺🇸 933 67 55ms 19 Aug 2025 556th edsrzf 🇳🇿 933 67 59ms 4 Sep 2025 556th CaedenHarper 🇨🇦 933 67 58ms 4 Sep 2025 556th KasperKivimaeki 🇫🇮 933 67 59ms 18 Nov 2025 556th snoozingnewt 🇨🇦 933 67 59ms 3 Dec 2025 556th emgordon154 933 67 66ms 8 Feb 2026 556th GolfingSuccess 🇬🇷 933 67 61ms 15 days ago 584th o0lit3 🇺🇸 930 22 108ms 11 Feb 2021 584th SirBogman 🇺🇸 930 22 108ms 31 May 2022 584th Betuaredead 930 22 118ms 12 Nov 2023 584th snoozingnewt 🇨🇦 930 22 97ms 3 Dec 2025 588th lukegustafson 🇺🇸 930 35 137ms 4 Aug 2024 588th JayXon 🇺🇸 930 35 132ms 4 Aug 2024 588th Lydxn 🇨🇦 930 35 155ms 6 Aug 2024 588th Steffan153 🇫🇮 930 35 134ms 6 Aug 2024 588th sean-niemann 🇺🇸 930 35 131ms 6 Feb 2025 593rd inventshah 929 40 1ms 30 Oct 2022 593rd Lydxn 🇨🇦 929 40 1ms 30 Oct 2022 593rd GrayJoKing 🇦🇺 929 40 1ms 3 Nov 2022 593rd sisyphus-ppcg 🇦🇺 929 40 1ms 3 Nov 2022 593rd sean-niemann 🇺🇸 929 40 1ms 4 Nov 2022 593rd btnlq 929 40 1ms 5 Nov 2022 593rd MeWhenI 🇻🇦 929 40 1ms 5 Nov 2022 593rd primo-ppcg 🇹🇭 929 40 1ms 6 Nov 2022 593rd Steffan153 🇫🇮 929 40 1ms 26 Nov 2022 593rd DialFrost 🇸🇬 929 40 1ms 12 Jan 2023 593rd prplz 🇦🇺 929 40 1ms 12 Jan 2023 593rd Shanethegamer 🇺🇸 929 40 1ms 6 Feb 2023 593rd JayXon 🇺🇸 929 40 1ms 16 Mar 2023 593rd xsot 🇸🇬 929 40 1ms 14 Jul 2023 593rd Yewzir 🇧🇪 929 40 1ms 12 Oct 2023 593rd Betuaredead 929 40 1ms 11 Nov 2023 593rd pardouin 🇫🇷 929 40 1ms 17 Aug 2024 593rd fuzzylojik-golf 🇺🇸 929 40 2ms 1 Jul 2025 593rd edsrzf 🇳🇿 929 40 1ms 4 Sep 2025 593rd snoozingnewt 🇨🇦 929 40 2ms 20 Oct 2025 593rd KasperKivimaeki 🇫🇮 929 40 1ms 15 Dec 2025 593rd GolfingSuccess 🇬🇷 929 40 1ms 15 days ago 615th NewDefectus 🇮🇱 928 22 33ms 10 Oct 2021 615th yzhs 🇩🇪 928 22 33ms 20 Jul 2022 615th saltysylvi 928 22 34ms 5 Aug 2022 615th ashtraypettingzoo 🇺🇸 928 22 33ms 22 Feb 2023 615th MeWhenI 🇻🇦 928 22 33ms 7 Aug 2023 615th Yewzir 🇧🇪 928 22 33ms 6 Nov 2023 615th Natanaelel 🇸🇪 928 22 33ms 28 Nov 2023 615th orthoplex 🇨🇽 928 22 33ms 20 Jul 2024 623rd Lydxn 🇨🇦 928 37 3ms 29 Sep 2022 623rd GrayJoKing 🇦🇺 928 37 3ms 29 Sep 2022 623rd DialFrost 🇸🇬 928 37 3ms 24 Jan 2023 623rd Steffan153 🇫🇮 928 37 3ms 3 Feb 2023 623rd sisyphus-ppcg 🇦🇺 928 37 3ms 4 Feb 2023 623rd prplz 🇦🇺 928 37 3ms 18 May 2023 623rd ovs-code 🇩🇪 928 37 3ms 17 Jul 2023 623rd sean-niemann 🇺🇸 928 37 3ms 23 Oct 2023 623rd xsot 🇸🇬 928 37 3ms 8 Feb 2024 623rd Yewzir 🇧🇪 928 37 2ms 2 Mar 2024 623rd pardouin 🇫🇷 928 37 3ms 20 Aug 2024 623rd edsrzf 🇳🇿 928 37 3ms 4 Sep 2025 635th edsrzf 🇳🇿 927 32 962ms 4 Sep 2025 635th DialFrost 🇸🇬 927 32 935ms 4 Sep 2025 635th CaedenHarper 🇨🇦 927 32 934ms 9 Sep 2025 635th sean-niemann 🇺🇸 927 32 685ms 12 Sep 2025 635th fuzzylojik-golf 🇺🇸 927 32 959ms 22 Sep 2025 635th snoozingnewt 🇨🇦 927 32 1,052ms 20 Oct 2025 First Prev 561–640 of 3,415 Next Last