The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Day of Week 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 721st canissimia 🇦🇶 805 211 154ms 22 Aug 2023 722nd stefangimmillaro 804 155 835ms 19 Aug 2023 723rd wasabi-avalanches 803 47 38ms 6 Apr 2024 723rd emgordon154 803 47 39ms 17 Nov 2024 723rd Lv0Sys 🇵🇱 803 47 38ms 8 Dec 2025 723rd Ronterox 803 47 39ms 4 Feb 2026 727th MeWhenI 🇻🇦 803 74 419ms 27 Jul 2024 727th HumanoidCPU 803 74 379ms 27 Sep 2024 729th Yewzir 🇧🇪 803 84 50ms 5 Nov 2023 729th XenThe 🇬🇧 803 84 60ms 23 Jun 2025 731st Shanethegamer 🇺🇸 803 104 4ms 16 Apr 2023 732nd Yewzir 🇧🇪 803 153 487ms 4 Jul 2023 733rd JunkIce 802 76 427ms 3 Dec 2024 734th xbxbxb007 802 133 290ms 10 Jan 2024 735th edsrzf 🇳🇿 802 262 80ms 4 days ago 736th lifthrasiir 🇰🇷 801 264 34ms 19 Dec 2024 737th greenstuartj 800 20 317ms 4 Jan 2024 738th primo-ppcg 🇹🇭 800 308 15ms 2 Aug 2023 739th DialFrost 🇸🇬 799 91 188ms 3 Jun 2025 740th GolfingSuccess 🇬🇷 799 336 1,438ms 4 Feb 2025 740th ovs-code 🇩🇪 799 336 1,527ms 24 Feb 2026 742nd emgordon154 798 154 603ms 25 May 2025 743rd DialFrost 🇸🇬 797 85 1,391ms 14 Feb 2026 744th Steffan153 🇫🇮 797 96 81ms 18 Apr 2023 744th lynn 797 96 83ms 16 Oct 2023 746th GolfingSuccess 🇬🇷 796 201 806ms 27 Feb 2026 747th ShepardToTheStars 795 74 371ms 4 Jan 2024 747th KatieLG 🇬🇧 795 74 368ms 30 Apr 2024 747th codewrite 🇬🇧 795 74 377ms 19 Apr 2025 750th fuzzylojik-golf 🇺🇸 794 68 2,631ms 31 Dec 2025 751st edsrzf 🇳🇿 794 175 10ms 21 days ago 752nd Lydxn 🇨🇦 792 75 151ms 18 Apr 2023 752nd Shanethegamer 🇺🇸 792 75 132ms 21 Apr 2023 752nd MeWhenI 🇻🇦 792 75 123ms 26 May 2023 752nd jipsong 🇩🇪 792 75 151ms 13 Oct 2023 752nd edsrzf 🇳🇿 792 75 135ms 23 Sep 2024 757th Steffan153 🇫🇮 792 76 17ms 16 Apr 2023 757th GrayJoKing 🇦🇺 792 76 16ms 17 Apr 2023 757th Lydxn 🇨🇦 792 76 17ms 26 May 2023 757th ovs-code 🇩🇪 792 76 17ms 2 Jul 2024 761st SirBogman 🇺🇸 789 215 41ms 3 Jun 2025 762nd TinyPandas 788 106 4ms 12 Sep 2023 762nd TheLastZombie 788 106 3ms 15 May 2024 764th MeWhenI 🇻🇦 788 158 850ms 20 Aug 2023 764th sean-niemann 🇺🇸 788 158 778ms 22 Aug 2024 764th Steffan153 🇫🇮 788 158 809ms 22 Aug 2024 767th albanian-laundromat 788 206 5ms 6 Jul 2025 768th blaztoma 🇱🇹 786 48 39ms 19 Oct 2025 768th beirigo 🇧🇷 786 48 37ms 30 Oct 2025 770th retrohun 785 104 179ms 16 Jun 2024 771st kxwish 🇨🇦 784 86 57ms 12 Sep 2023 771st Maximizer02 784 86 55ms 17 Sep 2025 771st jateute 784 86 51ms 27 Oct 2025 774th hotmanga 784 136 273ms 26 Oct 2023 775th janAkali 🇷🇺 782 76 390ms 15 May 2024 776th stefangimmillaro 782 217 44ms 26 Apr 2025 777th snoozingnewt 🇨🇦 781 93 205ms 14 Dec 2025 778th GolfingSuccess 🇬🇷 781 269 79ms 8 days ago 779th DialFrost 🇸🇬 780 107 3ms 1 Sep 2025 780th zacjl 779 99 18ms 30 Jul 2025 781st kg583 🇺🇸 778 270 79ms 4 days ago 782nd adyache 🇺🇸 777 174 27ms 16 Jun 2023 783rd typeswitch-dev 🇵🇹 776 232 8ms 22 Jul 2023 784th Sinescape 775 87 74ms 16 Sep 2024 784th BREMAUCY 🇫🇷 775 87 52ms 13 Dec 2025 786th SirBogman 🇺🇸 775 89 36ms 4 Dec 2023 787th AlephSquirrel 775 96 9ms 6 May 2025 788th kkoenig 773 133 450ms 23 Dec 2023 789th MrPsyware 773 138 287ms 20 Mar 2024 790th sean-niemann 🇺🇸 772 114 41ms 8 May 2023 791st sean-niemann 🇺🇸 772 239 301ms 8 Jun 2025 791st lynn 772 239 272ms 6 Nov 2025 793rd commandz0 🇺🇸 771 85 14ms 16 Apr 2023 793rd 5cw 🇺🇸 771 85 14ms 16 Apr 2023 793rd SirBogman 🇺🇸 771 85 15ms 17 Apr 2023 793rd janbehrens 🇩🇪 771 85 14ms 15 May 2023 793rd bobbysq 771 85 15ms 27 May 2023 793rd PikeIt 771 85 15ms 26 Jun 2023 793rd ovs-code 🇩🇪 771 85 15ms 2 Oct 2023 793rd inventshah 771 85 14ms 2 Oct 2023 First Prev 721–800 of 1,507 Next Last