The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 628th lelbal 869 94 13ms 6 Nov 2025 628th denkyuu1 869 94 14ms 7 Feb 2026 643rd ovs-code 🇩🇪 867 89 4ms 24 Feb 2026 644th weliveinhell 🇭🇹 867 123 296ms 1 Oct 2023 644th jerrandolph 867 123 274ms 20 Oct 2023 644th r3vit 867 123 279ms 27 Dec 2023 644th ibeucaly 867 123 301ms 26 Apr 2025 644th snoozingnewt 🇨🇦 867 123 308ms 17 Oct 2025 649th JayXon 🇺🇸 866 142 529ms 14 Jul 2023 649th Shanethegamer 🇺🇸 866 142 501ms 14 Jul 2023 649th Lydxn 🇨🇦 866 142 521ms 14 Jul 2023 649th sean-niemann 🇺🇸 866 142 505ms 20 Jul 2024 649th Steffan153 🇫🇮 866 142 612ms 20 Jul 2024 654th ccolella-mdc 865 68 414ms 12 Oct 2023 655th edsrzf 🇳🇿 865 84 191ms 24 May 2025 655th JayXon 🇺🇸 865 84 251ms 24 May 2025 657th cryosis7 864 78 50ms 23 Aug 2023 657th jbt 864 78 48ms 26 Dec 2023 657th rastapasta 864 78 51ms 7 Aug 2024 660th 2bular 863 80 38ms 15 days ago 661st 386asm 🇺🇸 863 102 44ms 2 May 2023 662nd JayXon 🇺🇸 863 140 257ms 30 Oct 2024 663rd voytxt 🇨🇿 862 80 220ms 3 Aug 2024 663rd GrayJoKing 🇦🇺 862 80 210ms 12 Aug 2024 665th jacobly0 🇺🇸 862 99 2ms 2 Oct 2023 665th kkoenig 862 99 2ms 28 Dec 2023 667th stefangimmillaro 861 69 421ms 13 Oct 2024 668th HumanEquivalentUnit 860 70 16ms 28 Nov 2023 669th guilhem-roy 🇫🇷 860 95 22ms 20 Jun 2023 669th jamopher 860 95 22ms 6 Nov 2023 671st ovs-code 🇩🇪 860 143 468ms 14 Jul 2023 671st DialFrost 🇸🇬 860 143 488ms 31 Jan 2026 673rd AlephSquirrel 859 89 70ms 17 Apr 2023 673rd GolfingSuccess 🇬🇷 859 89 69ms 26 Nov 2023 675th Steffan153 🇫🇮 859 103 58ms 23 Apr 2023 675th m-tkach 🇺🇦 859 103 58ms 23 Apr 2023 675th Lydxn 🇨🇦 859 103 61ms 26 May 2023 675th sean-niemann 🇺🇸 859 103 60ms 2 Nov 2023 675th DialFrost 🇸🇬 859 103 59ms 23 Dec 2024 675th edsrzf 🇳🇿 859 103 57ms 3 Jan 2026 681st kaascevich 859 145 895ms 22 Jul 2025 681st JayXon 🇺🇸 859 145 759ms 23 Jul 2025 683rd dokutan 858 112 154ms 11 Nov 2025 683rd DialFrost 🇸🇬 858 112 156ms 12 Feb 2026 685th Steffan153 🇫🇮 858 131 7ms 20 Aug 2023 685th edsrzf 🇳🇿 858 131 6ms 5 Dec 2024 685th primo-ppcg 🇹🇭 858 131 7ms 27 Jan 2025 685th kg583 🇺🇸 858 131 7ms 26 Sep 2025 685th sean-niemann 🇺🇸 858 131 7ms 27 Sep 2025 690th primo-ppcg 🇹🇭 857 112 4ms 19 Apr 2023 690th saito-ta 🇯🇵 857 112 3ms 20 Apr 2023 692nd erikgaal 855 51 5ms 5 Jan 2024 693rd pardouin 🇫🇷 855 86 511ms 24 Sep 2025 693rd kmathis22 855 86 521ms 7 Dec 2025 693rd jkelly467 855 86 440ms 7 Jan 2026 696th edsrzf 🇳🇿 855 87 16ms 17 Oct 2025 696th kg583 🇺🇸 855 87 16ms 2 Nov 2025 698th tobeannouncd 855 89 179ms 11 Jan 2024 698th ovs-code 🇩🇪 855 89 177ms 22 May 2024 698th lynn 855 89 162ms 8 Jan 2025 698th Natanaelel 🇸🇪 855 89 166ms 8 Jun 2025 702nd GrayJoKing 🇦🇺 855 103 43ms 19 Apr 2023 703rd snoozingnewt 🇨🇦 854 144 520ms 15 Dec 2025 704th kumavale 854 216 222ms 31 Dec 2025 705th postie77 853 69 384ms 17 Apr 2023 705th janbehrens 🇩🇪 853 69 388ms 15 May 2023 705th arctouch-cristiannevianna 853 69 375ms 18 May 2023 705th jwonagel 853 69 394ms 29 Sep 2023 705th apocriva 853 69 383ms 24 Nov 2023 705th markcahigyan 🇭🇺 853 69 379ms 7 Feb 2024 705th sultan 853 69 377ms 28 Feb 2024 705th Matto58 853 69 375ms 8 Nov 2024 705th TRexOnGit 853 69 390ms 28 Nov 2024 705th SpareManiKatti 853 69 399ms 7 Apr 2025 705th aliakseikalosha 853 69 374ms 17 Jan 2026 705th bpharaldsson 853 69 401ms 29 Jan 2026 717th Cube14yt 853 79 54ms 19 Nov 2025 718th DialFrost 🇸🇬 853 100 3ms 15 Feb 2026 719th Intevel 🇩🇪 853 125 295ms 4 Jul 2023 719th xnacly 🇩🇪 853 125 288ms 4 Jul 2023 First Prev 641–720 of 1,511 Next Last