The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Pernicious Numbers (Long) 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 481st saito-ta 🇯🇵 861 41 12ms 24 Dec 2024 482nd annaproxy 861 56 18ms 8 Jan 2023 482nd sean-niemann 🇺🇸 861 56 19ms 25 Mar 2025 484th kmathis22 861 80 498ms 28 Oct 2025 484th emgordon154 861 80 372ms 9 Feb 2026 486th SirBogman 🇺🇸 860 53 439ms 20 Jan 2024 486th MeWhenI 🇻🇦 860 53 439ms 13 Jul 2024 488th Steffan153 🇫🇮 859 67 135ms 22 Nov 2022 489th GolfingSuccess 🇬🇷 859 106 104ms 2 days ago 490th stefangimmillaro 858 30 273ms 20 Nov 2022 490th GolfingSuccess 🇬🇷 858 30 309ms 11 days ago 492nd lynn 858 72 246ms 27 Jan 2023 493rd rak1507 🇬🇧 857 28 39ms 27 Jan 2023 493rd lifthrasiir 🇰🇷 857 28 3ms 27 Nov 2024 495th primo-ppcg 🇹🇭 856 46 43ms 20 Nov 2022 495th Shanethegamer 🇺🇸 856 46 51ms 21 Nov 2022 497th Steffan153 🇫🇮 856 52 63ms 12 Aug 2024 497th ovs-code 🇩🇪 856 52 55ms 10 Oct 2024 499th za3k 856 58 18ms 20 Nov 2022 499th MeWhenI 🇻🇦 856 58 18ms 10 Oct 2023 499th marcin7Cd 856 58 16ms 28 Apr 2025 499th jipsong 🇩🇪 856 58 24ms 20 Jun 2025 503rd kg583 🇺🇸 856 69 47ms 13 Feb 2025 503rd pardouin 🇫🇷 856 69 52ms 25 Apr 2025 503rd DialFrost 🇸🇬 856 69 49ms 25 Apr 2025 506th emplv 🇱🇻 855 80 24ms 30 Nov 2022 507th Steffan153 🇫🇮 853 86 57ms 14 Jan 2023 507th tailorspy 853 86 57ms 24 May 2024 507th snyderek 🇺🇸 853 86 61ms 13 Oct 2024 507th MostParsingVex 853 86 59ms 9 hours ago 511th kg583 🇺🇸 851 63 47ms 26 Aug 2025 512th Liibe 850 81 449ms 25 Sep 2025 512th Yax42 🇫🇷 850 81 442ms 6 Oct 2025 512th MeWhenI 🇻🇦 850 81 502ms 7 Nov 2025 515th MarcMush 🇫🇷 849 49 402ms 11 Jan 2024 515th antimon2 🇯🇵 849 49 294ms 5 May 2024 517th primo-ppcg 🇹🇭 849 62 83ms 20 Nov 2022 518th MeWhenI 🇻🇦 848 68 83ms 24 Dec 2024 519th pardouin 🇫🇷 846 68 149ms 23 Apr 2025 520th Shanethegamer 🇺🇸 845 80 478ms 26 Apr 2023 520th DialFrost 🇸🇬 845 80 472ms 3 Jun 2024 520th ovs-code 🇩🇪 845 80 459ms 23 Jul 2024 523rd ovs-code 🇩🇪 845 149 1,442ms 27 Mar 2025 524th Shanethegamer 🇺🇸 844 54 424ms 16 Jan 2024 524th Yewzir 🇧🇪 844 54 398ms 24 Feb 2024 524th dokutan 844 54 395ms 14 Feb 2026 527th DialFrost 🇸🇬 844 81 24ms 23 Dec 2024 527th fuzzylojik-golf 🇺🇸 844 81 24ms 20 Aug 2025 529th Steffan153 🇫🇮 843 70 43ms 12 Feb 2026 530th m-tkach 🇺🇦 843 87 63ms 22 Nov 2022 530th sean-niemann 🇺🇸 843 87 69ms 7 Feb 2023 532nd QuincyNash 🇺🇸 842 59 20ms 1 Dec 2022 532nd yzhs 🇩🇪 842 59 22ms 23 Jun 2023 532nd AlexanderFair 842 59 26ms 18 Jul 2023 532nd Grrisly 842 59 18ms 30 Mar 2024 536th snoozingnewt 🇨🇦 840 96 120ms 28 Nov 2025 537th anter69 🇭🇺 838 47 46ms 24 Jan 2023 537th emgordon154 838 47 51ms 19 Mar 2025 537th Lv0Sys 🇵🇱 838 47 43ms 7 Dec 2025 540th MeWhenI 🇻🇦 838 51 893ms 15 Sep 2025 540th dokutan 838 51 897ms 2 Dec 2025 542nd MeWhenI 🇻🇦 838 64 52ms 9 Apr 2024 543rd primo-ppcg 🇹🇭 838 135 1,735ms 15 Sep 2025 544th Steffan153 🇫🇮 837 56 31ms 9 Feb 2023 544th sean-niemann 🇺🇸 837 56 34ms 2 Aug 2024 546th duckyluuk 🇳🇱 836 69 96ms 25 Dec 2024 547th ovs-code 🇩🇪 835 74 332ms 12 Nov 2023 548th primo-ppcg 🇹🇭 834 82 25ms 20 Nov 2022 549th emgordon154 833 62 2,707ms 8 Nov 2024 550th janbehrens 🇩🇪 832 50 352ms 11 Jul 2023 550th Yewzir 🇧🇪 832 50 278ms 26 Feb 2024 552nd lynn 830 31 135ms 16 Oct 2023 552nd CaedenHarper 🇨🇦 830 31 315ms 14 days ago 554th elgan65536 🇺🇸 830 83 400ms 19 Feb 2026 555th neel11235813 829 55 437ms 27 Mar 2024 556th SirBogman 🇺🇸 829 60 41ms 9 Jan 2024 557th Ripick 829 69 151ms 8 Jan 2023 557th dokutan 829 69 146ms 31 Dec 2023 557th Yewzir 🇧🇪 829 69 152ms 14 Feb 2024 557th janAkali 🇷🇺 829 69 153ms 3 days ago First Prev 481–560 of 1,868 Next Last