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?
Evil 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 782nd AstroOrbis 893 44 9ms 13 Feb 2026 782nd madex 🇩🇪 893 44 10ms 14 days ago 782nd Googolplexo 🇷🇺 893 44 9ms 5 hours ago 804th sisyphus-ppcg 🇦🇺 892 40 1ms 10 Jun 2021 804th lynn 892 40 1ms 18 Nov 2021 804th steffan-polygolf 892 40 2ms 24 Feb 2023 804th xsot 🇸🇬 892 40 1ms 21 Oct 2023 804th synt7x 🇺🇸 892 40 1ms 14 Jul 2025 804th fuzzylojik-golf 🇺🇸 892 40 1ms 2 Sep 2025 804th edsrzf 🇳🇿 892 40 1ms 24 Feb 2026 811th GrayJoKing 🇦🇺 890 38 1ms 9 Oct 2023 811th edsrzf 🇳🇿 890 38 2ms 24 Feb 2026 813th MeWhenI 🇻🇦 890 46 6ms 16 Dec 2024 813th Steffan153 🇫🇮 890 46 6ms 21 Feb 2026 815th nwellnhof 🇩🇪 890 72 61ms 3 Jan 2022 815th primo-ppcg 🇹🇭 890 72 59ms 18 Jan 2022 815th Shanethegamer 🇺🇸 890 72 60ms 3 Apr 2023 815th DialFrost 🇸🇬 890 72 57ms 16 Jan 2024 815th ovs-code 🇩🇪 890 72 65ms 8 Jun 2024 815th Herbert00709 🇵🇱 890 72 67ms 12 Jul 2024 815th MostParsingVex 890 72 54ms 26 Aug 2024 815th fuzzylojik-golf 🇺🇸 890 72 55ms 20 Aug 2025 815th 09cf 890 72 58ms 25 Nov 2025 824th primo-ppcg 🇹🇭 888 53 115ms 3 Jul 2019 824th marcin7Cd 888 53 119ms 13 Mar 2020 824th ssiquoya 🇷🇺 888 53 116ms 12 Jun 2021 824th GrayJoKing 🇦🇺 888 53 1ms 6 Jul 2021 824th emplv 🇱🇻 888 53 1ms 28 Apr 2022 824th inventshah 888 53 2ms 12 Jun 2022 824th Irratix 🇳🇱 888 53 1ms 13 Jun 2022 824th michael-pruglo 🇺🇦 888 53 1ms 14 Jul 2022 824th Alex-x90 🇺🇸 888 53 1ms 29 Jul 2022 824th Shanethegamer 🇺🇸 888 53 119ms 22 Mar 2023 824th stefangimmillaro 888 53 1ms 12 Jun 2023 824th Yewzir 🇧🇪 888 53 1ms 14 Oct 2023 824th Betuaredead 888 53 1ms 11 Nov 2023 824th Mandrzejy 🇵🇱 888 53 2ms 14 Apr 2024 824th pardouin 🇫🇷 888 53 1ms 29 Sep 2024 824th tigerdan2 🇩🇪 888 53 1ms 8 Jan 2025 824th AdrienHache 🇫🇷 888 53 2ms 1 Dec 2025 841st lifthrasiir 🇰🇷 887 58 6ms 19 Dec 2024 842nd kg583 🇺🇸 886 36 416ms 11 Mar 2024 842nd pardouin 🇫🇷 886 36 378ms 11 Jul 2024 844th bendiscz 886 82 340ms 19 Apr 2020 844th dpatterbee 886 82 351ms 20 Aug 2020 844th MeWhenI 🇻🇦 886 82 294ms 4 Nov 2021 844th GrayJoKing 🇦🇺 886 82 286ms 10 Mar 2022 844th m-tkach 🇺🇦 886 82 274ms 14 Jun 2023 844th DialFrost 🇸🇬 886 82 280ms 26 Sep 2023 844th ovs-code 🇩🇪 886 82 279ms 6 Oct 2023 844th Yewzir 🇧🇪 886 82 286ms 25 Oct 2023 844th Betuaredead 886 82 334ms 13 Nov 2023 844th kkoenig 886 82 293ms 2 Jan 2024 844th pardouin 🇫🇷 886 82 277ms 23 Aug 2024 844th albanian-laundromat 886 82 258ms 13 days ago 844th CaedenHarper 🇨🇦 886 82 269ms 13 days ago 857th JayXon 🇺🇸 885 29 3ms 7 Mar 2021 857th Steffan153 🇫🇮 885 29 2ms 5 Aug 2024 857th saito-ta 🇯🇵 885 29 3ms 20 Aug 2025 857th sean-niemann 🇺🇸 885 29 3ms 28 Nov 2025 861st GrayJoKing 🇦🇺 885 36 5ms 21 May 2021 862nd DialFrost 🇸🇬 885 37 891ms 29 Aug 2025 862nd rucin93 🇵🇱 885 37 938ms 29 Aug 2025 864th Shanethegamer 🇺🇸 885 64 28ms 22 Mar 2023 864th lynn 885 64 25ms 11 Jul 2023 864th GrayJoKing 🇦🇺 885 64 26ms 11 Aug 2023 864th m-tkach 🇺🇦 885 64 27ms 11 Aug 2023 868th nwellnhof 🇩🇪 884 62 421ms 25 Sep 2025 868th Yewzir 🇧🇪 884 62 389ms 2 Oct 2025 868th MeWhenI 🇻🇦 884 62 476ms 7 Nov 2025 871st Shanethegamer 🇺🇸 884 63 104ms 15 Apr 2025 871st emgordon154 884 63 123ms 27 Nov 2025 871st DialFrost 🇸🇬 884 63 109ms 27 Nov 2025 871st GolfingSuccess 🇬🇷 884 63 104ms 27 Nov 2025 871st edsrzf 🇳🇿 884 63 125ms 28 Nov 2025 871st snoozingnewt 🇨🇦 884 63 111ms 30 Nov 2025 871st sean-niemann 🇺🇸 884 63 111ms 7 Dec 2025 871st Steffan153 🇫🇮 884 63 156ms 22 Feb 2026 879th antimon2 🇯🇵 883 29 346ms 11 Jul 2024 880th Irratix 🇳🇱 881 31 1,248ms 25 Mar 2021 First Prev 801–880 of 5,124 Next Last