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?
Day of Week in all languages in bytes. 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 Bytes Time Submitted 395th sean-niemann 🇺🇸 904 118 294ms 31 Aug 2023 395th Yewzir 🇧🇪 904 118 320ms 26 Oct 2023 395th Betuaredead 904 118 303ms 12 Nov 2023 395th kkoenig 904 118 310ms 28 Dec 2023 395th DialFrost 🇸🇬 904 118 311ms 5 Jun 2024 395th edsrzf 🇳🇿 904 118 290ms 27 Sep 2024 395th pardouin 🇫🇷 904 118 310ms 6 Oct 2024 395th CaedenHarper 🇨🇦 904 118 313ms 8 Jan 2025 395th emgordon154 904 118 280ms 18 Jan 2025 395th GolfingSuccess 🇬🇷 904 118 282ms 18 Feb 2025 395th targrik 904 118 268ms 29 Jun 2025 395th fuzzylojik-golf 🇺🇸 904 118 310ms 4 Aug 2025 395th KasperKivimaeki 🇫🇮 904 118 283ms 4 Oct 2025 414th DialFrost 🇸🇬 903 43 4ms 12 Aug 2024 414th Steffan153 🇫🇮 903 43 4ms 12 Aug 2024 414th sisyphus-ppcg 🇦🇺 903 43 4ms 13 Aug 2024 414th Shanethegamer 🇺🇸 903 43 4ms 16 Aug 2024 414th btnlq 903 43 4ms 21 Aug 2024 414th emgordon154 903 43 4ms 22 Aug 2024 414th ovs-code 🇩🇪 903 43 4ms 30 Sep 2024 414th lynn 903 43 4ms 21 Dec 2024 414th sean-niemann 🇺🇸 903 43 4ms 11 Jan 2025 414th edsrzf 🇳🇿 903 43 5ms 21 Jul 2025 424th edsrzf 🇳🇿 900 60 2,626ms 1 Sep 2025 424th pardouin 🇫🇷 900 60 2,618ms 1 Sep 2025 424th JayXon 🇺🇸 900 60 2,604ms 2 Sep 2025 424th DialFrost 🇸🇬 900 60 2,563ms 6 Sep 2025 424th snoozingnewt 🇨🇦 900 60 2,650ms 14 Dec 2025 424th sean-niemann 🇺🇸 900 60 2,711ms 7 Jan 2026 424th Steffan153 🇫🇮 900 60 2,594ms 13 Feb 2026 431st Lydxn 🇨🇦 900 66 386ms 2 Aug 2023 431st sean-niemann 🇺🇸 900 66 387ms 2 Aug 2023 431st JayXon 🇺🇸 900 66 389ms 2 Aug 2023 431st m-tkach 🇺🇦 900 66 391ms 2 Aug 2023 431st Steffan153 🇫🇮 900 66 384ms 2 Aug 2023 431st pardouin 🇫🇷 900 66 398ms 9 Oct 2024 431st edsrzf 🇳🇿 900 66 383ms 10 Jun 2025 431st DialFrost 🇸🇬 900 66 368ms 14 Dec 2025 431st snoozingnewt 🇨🇦 900 66 365ms 14 Dec 2025 431st prestosilver 🇺🇸 900 66 391ms 23 Jan 2026 441st Ashikpaul 🇮🇳 899 75 51ms 13 Oct 2024 441st 823126 899 75 54ms 13 Nov 2024 441st n3uromanc3r 899 75 52ms 28 Nov 2024 441st Yax42 🇫🇷 899 75 56ms 5 Sep 2025 445th edsrzf 🇳🇿 898 43 967ms 28 Aug 2025 445th sean-niemann 🇺🇸 898 43 732ms 30 Aug 2025 445th DialFrost 🇸🇬 898 43 1,088ms 6 Sep 2025 445th jipsong 🇩🇪 898 43 1,078ms 26 Sep 2025 445th xsot 🇸🇬 898 43 912ms 15 Nov 2025 445th Steffan153 🇫🇮 898 43 834ms 14 Feb 2026 451st scpchicken 🇵🇼 898 91 37ms 16 Apr 2023 451st anter69 🇭🇺 898 91 22ms 17 Apr 2023 451st stefangimmillaro 898 91 20ms 20 Apr 2023 451st Alex-x90 🇺🇸 898 91 21ms 15 May 2023 451st AlexanderFair 898 91 22ms 11 Jul 2023 451st orthoplex 🇨🇽 898 91 22ms 3 Oct 2023 451st Ralac07 🇦🇺 898 91 22ms 11 Jun 2024 451st EnTerr 898 91 22ms 8 Sep 2024 451st Pyroan 898 91 20ms 16 Apr 2025 451st bknower 898 91 21ms 27 Jun 2025 451st luuumine 🇫🇷 898 91 21ms 3 Nov 2025 451st plcc0 898 91 22ms 11 Jan 2026 451st dgambit 898 91 23ms 20 Jan 2026 464th JayXon 🇺🇸 898 93 3ms 3 May 2023 464th jacobly0 🇺🇸 898 93 3ms 29 Aug 2023 464th adriweb 🇫🇷 898 93 3ms 9 Sep 2023 464th Waffle3z 898 93 3ms 11 Sep 2023 464th GoateSo 898 93 3ms 14 Sep 2023 464th microcanary 898 93 3ms 14 Sep 2023 464th FlyingPenguin223 898 93 3ms 26 Nov 2024 464th kamihitoe 898 93 3ms 15 Jan 2025 464th edsrzf 🇳🇿 898 93 2ms 26 Jul 2025 464th GrayJoKing 🇦🇺 898 93 3ms 28 Jul 2025 474th GolfingSuccess 🇬🇷 898 95 2ms 30 Dec 2024 475th inventshah 897 83 389ms 20 Jan 2024 475th edsrzf 🇳🇿 897 83 425ms 23 Sep 2024 475th commandz0 🇺🇸 897 83 464ms 1 Sep 2025 475th dokutan 897 83 376ms 14 Feb 2026 479th xsot 🇸🇬 896 45 2ms 6 Jan 2026 480th inventshah 894 115 442ms 16 Apr 2023 First Prev 401–480 of 1,510 Next Last