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 480th nwellnhof 🇩🇪 894 115 511ms 18 Apr 2023 480th JayXon 🇺🇸 894 115 453ms 19 Apr 2023 480th Alex-x90 🇺🇸 894 115 451ms 14 May 2023 480th Lydxn 🇨🇦 894 115 443ms 26 May 2023 480th ovs-code 🇩🇪 894 115 483ms 24 Aug 2023 480th sean-niemann 🇺🇸 894 115 439ms 19 Nov 2023 480th Steffan153 🇫🇮 894 115 455ms 10 Aug 2024 488th roavin 892 66 396ms 18 Oct 2023 488th HumanEquivalentUnit 892 66 399ms 25 Oct 2023 488th juliansiebert 🇩🇪 892 66 406ms 11 Dec 2024 491st rzv-me 890 49 5ms 5 Oct 2024 492nd ovs-code 🇩🇪 890 50 9ms 27 Sep 2024 492nd GrayJoKing 🇦🇺 890 50 9ms 30 Sep 2024 492nd sisyphus-ppcg 🇦🇺 890 50 9ms 1 Oct 2024 492nd DialFrost 🇸🇬 890 50 9ms 23 Dec 2024 492nd edsrzf 🇳🇿 890 50 8ms 7 Nov 2025 497th 4hg 🇺🇸 890 54 69ms 15 Sep 2023 497th gifti258 890 54 68ms 15 Sep 2023 499th m-tkach 🇺🇦 890 97 9ms 22 Oct 2024 499th orthoplex 🇨🇽 890 97 9ms 22 Oct 2024 499th edsrzf 🇳🇿 890 97 9ms 22 Oct 2024 499th UnderKoen 🇳🇱 890 97 10ms 23 Oct 2024 499th error256 890 97 9ms 23 Oct 2024 499th emgordon154 890 97 9ms 23 May 2025 499th roelderickx 890 97 9ms 12 days ago 506th commandz0 🇺🇸 889 18 247ms 23 Nov 2023 506th KasperKivimaeki 🇫🇮 889 18 276ms 8 Dec 2025 508th MeWhenI 🇻🇦 889 120 306ms 17 Apr 2023 509th damoc1es 888 92 14ms 16 Apr 2023 509th celiendonze 🇨🇭 888 92 15ms 17 Apr 2023 509th CarsonChr 🇺🇸 888 92 15ms 20 Apr 2023 509th klixel 🇨🇦 888 92 15ms 16 May 2023 509th kyleclaassen 888 92 14ms 24 May 2023 509th b10011 🇫🇮 888 92 14ms 12 Jun 2023 509th rollershutter 888 92 14ms 20 Jun 2023 509th fkantelberg 888 92 15ms 14 Jul 2023 509th RomanHauksson 888 92 15ms 20 Jul 2023 509th cros107 🇦🇺 888 92 14ms 18 Aug 2023 509th Mikey-Beep 🇬🇧 888 92 13ms 25 Aug 2023 509th m42km 888 92 23ms 13 Nov 2023 509th knutae 🇳🇴 888 92 23ms 13 Nov 2023 509th cubed-guy 888 92 14ms 6 Dec 2023 509th andrewjc2000 888 92 14ms 10 Feb 2024 509th RJFuller 888 92 34ms 19 Mar 2024 509th neel11235813 888 92 13ms 28 Mar 2024 509th leon-w 888 92 15ms 24 Jul 2024 509th ziselsberger 888 92 35ms 8 Oct 2024 509th croc54 888 92 15ms 29 Dec 2024 509th Troon 888 92 14ms 12 Mar 2025 509th albanian-laundromat 888 92 13ms 28 Jun 2025 509th mathieurodic 888 92 13ms 21 Oct 2025 509th retrohun 888 92 13ms 6 Nov 2025 509th jared-hughes 888 92 14ms 21 Dec 2025 509th josev814 888 92 14ms 21 Jan 2026 509th rustykitty 🇺🇸 888 92 14ms 5 Feb 2026 509th JOrE20 888 92 13ms 25 days ago 537th not-optikk 🇺🇸 888 94 4ms 14 Sep 2023 537th kxwish 🇨🇦 888 94 4ms 14 Sep 2023 537th Steffan153 🇫🇮 888 94 4ms 26 Feb 2024 540th Shanethegamer 🇺🇸 887 67 427ms 16 Apr 2023 540th MichalMarsalek 🇨🇿 887 67 423ms 16 Apr 2023 540th GrayJoKing 🇦🇺 887 67 425ms 17 Apr 2023 540th sisyphus-ppcg 🇦🇺 887 67 419ms 24 Apr 2023 544th kkoenig 887 76 55ms 22 Dec 2023 544th smclaughlin-cf 887 76 56ms 3 Mar 2025 546th Steffan153 🇫🇮 886 50 1,412ms 16 Apr 2023 546th JayXon 🇺🇸 886 50 1,458ms 17 Apr 2023 546th jipsong 🇩🇪 886 50 1,392ms 26 Jul 2024 546th emgordon154 886 50 1,478ms 17 Nov 2024 546th edsrzf 🇳🇿 886 50 1,427ms 23 Nov 2024 546th sean-niemann 🇺🇸 886 50 1,444ms 10 Apr 2025 546th snoozingnewt 🇨🇦 886 50 1,448ms 11 Dec 2025 553rd jkelly467 886 61 2,691ms 7 Jan 2026 554th annaproxy 886 84 420ms 21 Jan 2024 555th sisyphus-ppcg 🇦🇺 885 66 113ms 17 Apr 2023 555th Lydxn 🇨🇦 885 66 97ms 17 Apr 2023 555th GrayJoKing 🇦🇺 885 66 112ms 17 Apr 2023 555th nwellnhof 🇩🇪 885 66 113ms 17 Apr 2023 555th Steffan153 🇫🇮 885 66 105ms 18 Apr 2023 555th primo-ppcg 🇹🇭 885 66 104ms 22 Apr 2023 First Prev 481–560 of 1,510 Next Last
