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 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 kg583 🇺🇸 805 160 40ms 5 May 2025 722nd canissimia 🇦🇶 805 211 154ms 22 Aug 2023 723rd stefangimmillaro 804 155 835ms 19 Aug 2023 724th wasabi-avalanches 803 47 38ms 6 Apr 2024 724th emgordon154 803 47 39ms 17 Nov 2024 724th Lv0Sys 🇵🇱 803 47 38ms 8 Dec 2025 724th Ronterox 803 47 39ms 4 Feb 2026 728th MeWhenI 🇻🇦 803 74 419ms 27 Jul 2024 728th HumanoidCPU 803 74 379ms 27 Sep 2024 730th Yewzir 🇧🇪 803 84 50ms 5 Nov 2023 730th XenThe 🇬🇧 803 84 60ms 23 Jun 2025 732nd Shanethegamer 🇺🇸 803 104 4ms 16 Apr 2023 733rd Yewzir 🇧🇪 803 153 487ms 4 Jul 2023 734th JunkIce 802 76 427ms 3 Dec 2024 735th xbxbxb007 802 133 290ms 10 Jan 2024 736th edsrzf 🇳🇿 802 262 80ms 5 days ago 737th lifthrasiir 🇰🇷 801 264 34ms 19 Dec 2024 738th greenstuartj 800 20 317ms 4 Jan 2024 739th primo-ppcg 🇹🇭 800 308 15ms 2 Aug 2023 740th DialFrost 🇸🇬 799 91 188ms 3 Jun 2025 741st GolfingSuccess 🇬🇷 799 336 1,438ms 4 Feb 2025 741st ovs-code 🇩🇪 799 336 1,527ms 24 Feb 2026 743rd emgordon154 798 154 603ms 25 May 2025 744th DialFrost 🇸🇬 797 85 1,391ms 14 Feb 2026 745th Steffan153 🇫🇮 797 96 81ms 18 Apr 2023 745th lynn 797 96 83ms 16 Oct 2023 747th GolfingSuccess 🇬🇷 796 201 806ms 27 Feb 2026 748th ShepardToTheStars 795 74 371ms 4 Jan 2024 748th KatieLG 🇬🇧 795 74 368ms 30 Apr 2024 748th codewrite 🇬🇧 795 74 377ms 19 Apr 2025 751st fuzzylojik-golf 🇺🇸 794 68 2,631ms 31 Dec 2025 752nd edsrzf 🇳🇿 794 175 10ms 22 days ago 753rd Lydxn 🇨🇦 792 75 151ms 18 Apr 2023 753rd Shanethegamer 🇺🇸 792 75 132ms 21 Apr 2023 753rd MeWhenI 🇻🇦 792 75 123ms 26 May 2023 753rd jipsong 🇩🇪 792 75 151ms 13 Oct 2023 753rd edsrzf 🇳🇿 792 75 135ms 23 Sep 2024 758th Steffan153 🇫🇮 792 76 17ms 16 Apr 2023 758th GrayJoKing 🇦🇺 792 76 16ms 17 Apr 2023 758th Lydxn 🇨🇦 792 76 17ms 26 May 2023 758th ovs-code 🇩🇪 792 76 17ms 2 Jul 2024 762nd SirBogman 🇺🇸 789 215 41ms 3 Jun 2025 763rd TinyPandas 788 106 4ms 12 Sep 2023 763rd TheLastZombie 788 106 3ms 15 May 2024 765th MeWhenI 🇻🇦 788 158 850ms 20 Aug 2023 765th sean-niemann 🇺🇸 788 158 778ms 22 Aug 2024 765th Steffan153 🇫🇮 788 158 809ms 22 Aug 2024 768th albanian-laundromat 788 206 5ms 6 Jul 2025 769th blaztoma 🇱🇹 786 48 39ms 19 Oct 2025 769th beirigo 🇧🇷 786 48 37ms 30 Oct 2025 771st retrohun 785 104 179ms 16 Jun 2024 772nd kxwish 🇨🇦 784 86 57ms 12 Sep 2023 772nd Maximizer02 784 86 55ms 17 Sep 2025 772nd jateute 784 86 51ms 27 Oct 2025 775th hotmanga 784 136 273ms 26 Oct 2023 776th janAkali 🇷🇺 782 76 390ms 15 May 2024 777th stefangimmillaro 782 217 44ms 26 Apr 2025 778th snoozingnewt 🇨🇦 781 93 205ms 14 Dec 2025 779th GolfingSuccess 🇬🇷 781 269 79ms 9 days ago 780th DialFrost 🇸🇬 780 107 3ms 1 Sep 2025 781st zacjl 779 99 18ms 30 Jul 2025 782nd kg583 🇺🇸 778 270 79ms 5 days ago 783rd adyache 🇺🇸 777 174 27ms 16 Jun 2023 784th typeswitch-dev 🇵🇹 776 232 8ms 22 Jul 2023 785th Sinescape 775 87 74ms 16 Sep 2024 785th BREMAUCY 🇫🇷 775 87 52ms 13 Dec 2025 787th SirBogman 🇺🇸 775 89 36ms 4 Dec 2023 788th AlephSquirrel 775 96 9ms 6 May 2025 789th kkoenig 773 133 450ms 23 Dec 2023 790th MrPsyware 773 138 287ms 20 Mar 2024 791st sean-niemann 🇺🇸 772 114 41ms 8 May 2023 792nd sean-niemann 🇺🇸 772 239 301ms 8 Jun 2025 792nd lynn 772 239 272ms 6 Nov 2025 794th commandz0 🇺🇸 771 85 14ms 16 Apr 2023 794th 5cw 🇺🇸 771 85 14ms 16 Apr 2023 794th SirBogman 🇺🇸 771 85 15ms 17 Apr 2023 794th janbehrens 🇩🇪 771 85 14ms 15 May 2023 794th bobbysq 771 85 15ms 27 May 2023 794th PikeIt 771 85 15ms 26 Jun 2023 794th ovs-code 🇩🇪 771 85 15ms 2 Oct 2023 First Prev 721–800 of 1,507 Next Last