The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Abundant 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 239th error256 917 44 1,255ms 29 Jul 2024 242nd Lydxn 🇨🇦 917 109 291ms 22 Jan 2023 243rd Shanethegamer 🇺🇸 916 61 28ms 19 Apr 2023 243rd Steffan153 🇫🇮 916 61 27ms 19 Apr 2023 243rd AlephSquirrel 916 61 28ms 20 Apr 2023 243rd primo-ppcg 🇹🇭 916 61 86ms 30 Apr 2023 243rd Lydxn 🇨🇦 916 61 28ms 9 May 2023 243rd MeWhenI 🇻🇦 916 61 27ms 23 May 2023 243rd Andriamanitra 🇫🇮 916 61 28ms 13 Jul 2023 243rd GrayJoKing 🇦🇺 916 61 28ms 20 Aug 2023 243rd btnlq 916 61 29ms 21 Oct 2023 243rd dokutan 916 61 28ms 14 Jul 2024 243rd edsrzf 🇳🇿 916 61 27ms 2 Nov 2024 243rd emgordon154 916 61 27ms 28 Dec 2024 243rd sean-niemann 🇺🇸 916 61 28ms 21 Apr 2025 243rd kg583 🇺🇸 916 61 27ms 25 Sep 2025 243rd DialFrost 🇸🇬 916 61 29ms 24 Jan 2026 258th jared-hughes 916 71 9ms 19 Nov 2022 258th Steffan153 🇫🇮 916 71 9ms 20 Nov 2022 258th Waffle3z 916 71 9ms 11 Dec 2022 258th sean-niemann 🇺🇸 916 71 9ms 6 Mar 2025 262nd JayXon 🇺🇸 914 67 159ms 19 Nov 2022 262nd Lydxn 🇨🇦 914 67 153ms 20 Nov 2022 262nd Steffan153 🇫🇮 914 67 147ms 8 days ago 265th GrayJoKing 🇦🇺 913 67 130ms 19 Nov 2022 265th JayXon 🇺🇸 913 67 135ms 19 Nov 2022 265th primo-ppcg 🇹🇭 913 67 132ms 20 Nov 2022 265th Lydxn 🇨🇦 913 67 130ms 20 Nov 2022 265th MeWhenI 🇻🇦 913 67 137ms 22 Nov 2022 265th stefangimmillaro 913 67 132ms 4 Dec 2022 265th prplz 🇦🇺 913 67 123ms 8 Jan 2023 265th Steffan153 🇫🇮 913 67 147ms 13 Jan 2023 265th sean-niemann 🇺🇸 913 67 150ms 1 Jan 2025 265th kaascevich 913 67 135ms 8 Jul 2025 265th snoozingnewt 🇨🇦 913 67 136ms 30 Dec 2025 265th DialFrost 🇸🇬 913 67 135ms 23 Jan 2026 277th JayXon 🇺🇸 913 82 363ms 22 Nov 2022 278th stefangimmillaro 911 60 2,508ms 24 Oct 2024 278th MeWhenI 🇻🇦 911 60 2,775ms 27 Oct 2024 278th JayXon 🇺🇸 911 60 2,542ms 7 Nov 2024 278th JayXon 🇺🇸 911 60 15ms 19 Nov 2025 278th madex 🇩🇪 911 60 2,574ms 8 days ago 278th Steffan153 🇫🇮 911 60 2,662ms 8 days ago 284th Shanethegamer 🇺🇸 911 72 54ms 11 Dec 2023 284th Steffan153 🇫🇮 911 72 57ms 11 Dec 2023 284th Yewzir 🇧🇪 911 72 52ms 15 Dec 2023 284th Lydxn 🇨🇦 911 72 52ms 21 Dec 2023 284th dokutan 911 72 55ms 9 May 2024 284th edsrzf 🇳🇿 911 72 63ms 5 Jan 2025 284th zacjl 911 72 84ms 23 Feb 2025 284th sean-niemann 🇺🇸 911 72 54ms 29 Apr 2025 284th kg583 🇺🇸 911 72 56ms 30 Jul 2025 284th DialFrost 🇸🇬 911 72 52ms 15 Dec 2025 284th snoozingnewt 🇨🇦 911 72 44ms 18 days ago 295th FlorianCassayre 🇫🇷 910 59 30ms 21 Nov 2022 295th firegene 🇮🇪 910 59 31ms 3 Jan 2023 295th Yewzir 🇧🇪 910 59 32ms 11 Apr 2023 295th bzijlema 🇳🇱 910 59 29ms 24 Sep 2023 295th SB-945 910 59 31ms 31 Mar 2024 295th FranklinJiaChen 910 59 37ms 13 Jun 2024 295th lifthrasiir 🇰🇷 910 59 30ms 16 Nov 2024 295th Babafaba 910 59 30ms 7 Sep 2025 295th Andrey2001 910 59 22ms 27 Nov 2025 295th JOrE20 910 59 21ms 21 Dec 2025 295th Trildcookie 910 59 76ms 23 Dec 2025 306th JayXon 🇺🇸 910 63 1,110ms 21 Mar 2023 306th Lydxn 🇨🇦 910 63 1,135ms 21 Mar 2023 308th Steffan153 🇫🇮 909 54 11ms 20 Jul 2024 309th ovs-code 🇩🇪 909 63 244ms 12 Sep 2024 310th JayXon 🇺🇸 909 66 22ms 21 Mar 2023 310th Lydxn 🇨🇦 909 66 23ms 21 Mar 2023 310th albanian-laundromat 909 66 22ms 16 Sep 2025 310th Steffan153 🇫🇮 909 66 22ms 13 days ago 314th snyderek 🇺🇸 909 88 62ms 29 Oct 2024 314th JayXon 🇺🇸 909 88 60ms 9 Dec 2025 316th JayXon 🇺🇸 909 110 282ms 8 Feb 2024 317th Lydxn 🇨🇦 908 54 194ms 21 Feb 2023 318th Steffan153 🇫🇮 908 56 437ms 16 Jan 2024 318th DialFrost 🇸🇬 908 56 549ms 17 Jan 2024 318th xsot 🇸🇬 908 56 672ms 29 Jan 2024 First Prev 241–320 of 2,740 Next Last