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 720th tayloia 🇬🇧 769 78 11ms 3 Nov 2023 720th Andrey-Plotnikov 769 78 13ms 23 Jun 2025 720th targrik 769 78 10ms 26 Aug 2025 724th CLOStrophobic 🇮🇹 769 95 43ms 13 Feb 2025 725th sean-niemann 🇺🇸 769 158 3ms 8 Oct 2024 726th bac0id 768 113 1ms 24 Jun 2024 726th Mandrzejy 🇵🇱 768 113 1ms 20 Jul 2024 728th MeWhenI 🇻🇦 766 125 5ms 21 Jul 2023 729th sean-niemann 🇺🇸 763 165 257ms 2 Sep 2022 729th jared-hughes 763 165 248ms 10 Nov 2022 729th DialFrost 🇸🇬 763 165 237ms 5 Dec 2023 729th rucin93 🇵🇱 763 165 244ms 12 Feb 2024 733rd Daniel-Ellison 762 64 267ms 26 Feb 2026 733rd denkyuu1 762 64 318ms 2 days ago 735th Lydxn 🇨🇦 762 163 421ms 8 Sep 2021 735th primo-ppcg 🇹🇭 762 163 434ms 16 Sep 2021 737th Shanethegamer 🇺🇸 761 54 2ms 5 Nov 2022 738th ovs-code 🇩🇪 761 92 120ms 29 Apr 2024 739th Ocisaac 761 114 2ms 22 Mar 2024 739th LHLaurini 🇧🇷 761 114 2ms 3 Jul 2024 741st revlayle 🇺🇸 761 137 417ms 21 Jun 2022 741st stefangimmillaro 761 137 434ms 19 May 2024 741st MeWhenI 🇻🇦 761 137 427ms 29 Dec 2025 744th voytxt 🇨🇿 761 307 1,489ms 26 Jan 2025 745th emgordon154 760 79 12ms 23 Nov 2021 745th Salutations45 760 79 11ms 30 Dec 2024 747th rucin93 🇵🇱 759 71 142ms 31 Oct 2024 748th albanian-laundromat 759 160 150ms 28 Nov 2025 749th nents 758 143 2,961ms 24 Jan 2025 750th DialFrost 🇸🇬 757 64 62ms 10 Apr 2025 751st jared-hughes 757 97 2ms 6 Apr 2022 751st GrayJoKing 🇦🇺 757 97 2ms 10 Nov 2023 753rd ScottHamper 755 138 397ms 19 Apr 2022 753rd Shanethegamer 🇺🇸 755 138 405ms 16 Oct 2022 753rd amazingalek 🇳🇴 755 138 428ms 5 Jan 2026 756th MeWhenI 🇻🇦 754 310 1,436ms 10 Feb 2025 757th falsidge 753 80 20ms 11 Jun 2023 758th Yewzir 🇧🇪 753 115 105ms 28 Mar 2024 759th GolfingSuccess 🇬🇷 751 311 1,423ms 18 Jan 2025 760th czylabsonasa 🇭🇺 750 65 311ms 18 Jun 2022 761st LukeBridges 🇬🇧 750 80 10ms 3 Nov 2022 761st a1exeysv 🇺🇦 750 80 10ms 15 Mar 2023 763rd ovs-code 🇩🇪 750 100 2ms 10 Jun 2024 763rd GolfingSuccess 🇬🇷 750 100 2ms 19 Dec 2024 765th LS2021 750 139 421ms 24 Nov 2023 766th bstrat 749 40 7ms 9 Jul 2024 767th lynn 748 49 33ms 3 Sep 2021 768th DialFrost 🇸🇬 748 80 4ms 1 Nov 2023 769th not-a-pokemon 748 116 1ms 5 Jul 2025 769th solisolu 748 116 1ms 10 Nov 2025 771st inventshah 747 55 2ms 26 Jan 2023 771st MaliPatuljak 747 55 3ms 19 Apr 2023 773rd 1231234md5 🇨🇳 747 145 2,830ms 10 Dec 2023 773rd LHLaurini 🇧🇷 747 145 450ms 3 Jul 2024 775th GolfingSuccess 🇬🇷 746 112 13ms 14 Dec 2024 776th Shanethegamer 🇺🇸 745 163 3ms 16 Oct 2022 777th lilyyy411 744 81 17ms 9 Sep 2021 777th wh3n3v3r 🇨🇿 744 81 10ms 11 Nov 2024 779th MeWhenI 🇻🇦 743 129 42ms 7 Jul 2023 780th sisyphus-ppcg 🇦🇺 742 76 1,600ms 16 Jan 2024 781st FlyingPenguin223 742 99 43ms 29 Dec 2025 782nd Shanethegamer 🇺🇸 742 144 142ms 25 Feb 2023 783rd Maznek 741 81 10ms 22 Nov 2022 783rd Naruyoko 741 81 12ms 3 Mar 2023 783rd voytxt 🇨🇿 741 81 11ms 14 May 2023 783rd unfinishedprogram 741 81 10ms 4 Jul 2023 783rd two-bad 🇬🇧 741 81 10ms 4 Feb 2024 788th nikitadanilov 741 117 1ms 30 Oct 2022 788th Szum123321 🇵🇱 741 117 1ms 29 Nov 2023 788th Jasper-Ty 🇵🇭 741 117 2ms 5 Jun 2024 788th nomennescio 741 117 2ms 9 Dec 2024 792nd sean-niemann 🇺🇸 740 82 14ms 9 Oct 2024 793rd anoopsg 🇮🇳 740 117 119ms 14 Nov 2023 794th kmathis22 739 168 453ms 1 Oct 2025 795th DialFrost 🇸🇬 738 73 148ms 9 Oct 2024 796th not-a-pokemon 738 86 6ms 24 Feb 2026 797th orthoplex 🇨🇽 737 106 382ms 1 Nov 2021 798th c-cpp-a 737 147 2,896ms 25 Jul 2025 799th NewDefectus 🇮🇱 736 57 38ms 3 Sep 2021 799th o0lit3 🇺🇸 736 57 4ms 6 Sep 2021 First Prev 721–800 of 1,996 Next Last