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?
Fractions 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 801st Shanethegamer 🇺🇸 735 100 2ms 1 Nov 2022 802nd CatsAreFluffy 735 118 2ms 5 Feb 2023 803rd MeWhenI 🇻🇦 734 56 2ms 11 Nov 2022 804th mousetail 🇳🇱 734 87 517ms 1 Oct 2024 805th edsrzf 🇳🇿 734 118 197ms 24 May 2025 806th rifatx 734 142 390ms 9 Mar 2023 807th csharpython 732 23 33ms 2 Aug 2025 808th KatieLG 🇬🇧 732 77 356ms 28 Oct 2024 808th JunkIce 732 77 364ms 3 Dec 2024 810th igmcdowell 732 82 10ms 14 Nov 2021 810th CatsAreFluffy 732 82 9ms 29 Jan 2023 810th NickTheEASDude 🇺🇸 732 82 10ms 1 Feb 2024 810th wlaud9 732 82 12ms 25 Aug 2024 814th eddiesmithxyz 732 146 142ms 6 Jan 2023 815th andersk 🇺🇸 732 172 220ms 5 Nov 2022 816th Shanethegamer 🇺🇸 730 41 2ms 20 May 2022 816th 5cw 🇺🇸 730 41 5ms 5 Apr 2023 816th DialFrost 🇸🇬 730 41 3ms 6 Feb 2024 816th FortuiteMan 🇫🇷 730 41 2ms 10 Oct 2024 820th madex 🇩🇪 730 152 116ms 12 days ago 821st snoozingnewt 🇨🇦 730 170 595ms 31 Oct 2025 822nd MeWhenI 🇻🇦 728 119 175ms 70 mins ago 823rd chubbc 727 67 285ms 28 Dec 2024 824th DialFrost 🇸🇬 727 115 13ms 16 Dec 2024 825th snoozingnewt 🇨🇦 727 149 435ms 31 Oct 2025 826th oeb25 727 173 249ms 16 May 2022 827th robin-scragg 726 83 11ms 27 Jul 2025 828th scpchicken 🇵🇼 724 58 29ms 15 Dec 2022 829th MeWhenI 🇻🇦 724 134 592ms 7 Mar 2022 830th MathisBullinger 723 83 14ms 13 Nov 2021 830th inventshah 723 83 10ms 9 May 2022 830th xyangst 723 83 10ms 8 Oct 2024 830th Lv0Sys 🇵🇱 723 83 11ms 5 Dec 2025 834th djeedjay 🇳🇱 723 120 2ms 5 Sep 2021 834th xiaoyiming123 723 120 1ms 23 Jul 2025 836th emgordon154 723 241 1,777ms 25 days ago 837th MaliPatuljak 722 172 404ms 19 Apr 2023 837th HumanoidCPU 722 172 479ms 8 Nov 2025 837th madex 🇩🇪 722 172 382ms 12 days ago 840th DialFrost 🇸🇬 721 324 1,490ms 21 Jan 2025 841st sircfenner 720 102 1ms 3 Sep 2021 841st languidlizard28 720 102 2ms 3 Sep 2021 841st StarmaQ 720 102 1ms 7 Sep 2021 841st RockOfStone 720 102 3ms 10 Mar 2024 845th daniel-cardone 720 164 1,375ms 23 Jun 2025 846th alicethecatwhisperermeow 719 145 433ms 7 Aug 2024 847th Lv0Sys 🇵🇱 717 68 313ms 5 Dec 2025 848th yzhs 🇩🇪 717 84 10ms 5 Nov 2021 848th Anonymousellama21 717 84 49ms 9 Dec 2021 848th WilliamKeating 717 84 18ms 14 Jan 2022 851st strout 717 149 142ms 14 Dec 2023 852nd snoozingnewt 🇨🇦 715 155 117ms 31 Oct 2025 853rd klixel 🇨🇦 715 176 241ms 16 May 2023 854th janbehrens 🇩🇪 714 84 10ms 4 Sep 2021 854th fitzdotlol 🇺🇸 714 84 10ms 29 Mar 2022 854th jorduino 714 84 10ms 31 Oct 2022 854th Davr1 🇨🇿 714 84 11ms 26 Oct 2023 854th CaedenHarper 🇨🇦 714 84 14ms 23 Aug 2025 859th sultan 714 146 407ms 28 Feb 2024 860th razetime 713 42 2ms 24 Jan 2022 860th DaCuteRaccoon 713 42 2ms 30 Mar 2022 860th MeWhenI 🇻🇦 713 42 2ms 4 Aug 2022 860th bwenstar 713 42 3ms 11 Aug 2022 860th trist224 🇫🇷 713 42 2ms 28 Nov 2022 860th rucin93 🇵🇱 713 42 2ms 3 May 2023 860th snoozingnewt 🇨🇦 713 42 3ms 7 Sep 2023 860th neel11235813 713 42 3ms 20 Nov 2023 860th lifthrasiir 🇰🇷 713 42 11ms 29 Nov 2024 860th LostSyntax21 🇬🇧 713 42 3ms 19 Jan 2025 860th blaztoma 🇱🇹 713 42 2ms 27 Dec 2025 860th CornerMercury 🇬🇧 713 42 3ms 19 Jan 2026 872nd cmayer777 711 122 1ms 16 Oct 2022 872nd NickTheEASDude 🇺🇸 711 122 1ms 15 May 2024 874th inventshah 711 171 3ms 23 Sep 2022 875th mousetail 🇳🇱 711 177 225ms 16 Jan 2024 876th Echriser 710 110 378ms 9 Nov 2022 876th Steffan153 🇫🇮 710 110 413ms 2 Mar 2023 876th GrayJoKing 🇦🇺 710 110 387ms 27 Mar 2023 879th nulzo 709 85 16ms 17 Oct 2025 880th janbehrens 🇩🇪 709 147 372ms 10 Jan 2022 First Prev 801–880 of 1,996 Next Last