The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Farey Sequence 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 401st orthoplex 🇨🇽 837 67 11ms 1 Dec 2023 401st GolfingSuccess 🇬🇷 837 67 12ms 4 Dec 2023 401st elgan65536 🇺🇸 837 67 12ms 29 Mar 2024 401st stefangimmillaro 837 67 11ms 29 Apr 2024 401st zacjl 837 67 11ms 23 Aug 2024 401st HPWiz 🇳🇿 837 67 11ms 8 Dec 2025 407th GrayJoKing 🇦🇺 837 75 3ms 2 Dec 2023 408th Shanethegamer 🇺🇸 837 87 128ms 1 Dec 2023 408th DialFrost 🇸🇬 837 87 126ms 6 Aug 2024 410th edsrzf 🇳🇿 837 114 26ms 25 Apr 2025 411th duckyluuk 🇳🇱 836 87 2,428ms 25 Oct 2024 411th sean-niemann 🇺🇸 836 87 2,610ms 30 Oct 2024 413th pardouin 🇫🇷 835 50 34ms 9 Sep 2025 414th Tavistock 835 83 8ms 13 Dec 2023 414th dokutan 835 83 12ms 1 Jul 2024 416th lifthrasiir 🇰🇷 834 64 431ms 2 Dec 2024 416th dokutan 834 64 382ms 27 Feb 2026 418th DialFrost 🇸🇬 833 170 1,638ms 17 Jan 2026 419th rucin93 🇵🇱 831 63 148ms 5 Jan 2025 420th stefangimmillaro 830 62 1,271ms 29 Apr 2024 421st stefangimmillaro 830 82 114ms 30 Apr 2024 422nd MeWhenI 🇻🇦 830 115 25ms 1 Dec 2023 422nd emgordon154 830 115 26ms 54 mins ago 424th Yewzir 🇧🇪 829 103 55ms 26 May 2024 425th saito-ta 🇯🇵 828 61 346ms 1 Dec 2023 425th retrohun 828 61 507ms 16 Jun 2024 427th GolfingSuccess 🇬🇷 828 66 9ms 13 Aug 2024 428th Shanethegamer 🇺🇸 828 71 159ms 1 Dec 2023 429th SirBogman 🇺🇸 827 81 40ms 3 Jun 2025 430th MeWhenI 🇻🇦 827 103 3ms 1 Dec 2023 431st MeWhenI 🇻🇦 827 227 15ms 20 Apr 2025 432nd Shanethegamer 🇺🇸 826 76 123ms 1 Dec 2023 432nd MeWhenI 🇻🇦 826 76 121ms 1 Dec 2023 432nd edsrzf 🇳🇿 826 76 130ms 10 Jul 2025 435th stefangimmillaro 826 88 2,389ms 10 Nov 2024 436th duckyluuk 🇳🇱 825 82 153ms 25 Dec 2024 436th MeWhenI 🇻🇦 825 82 13ms 30 Dec 2024 436th GrayJoKing 🇦🇺 825 82 15ms 3 Feb 2025 439th CaedenHarper 🇨🇦 823 89 376ms 17 Oct 2025 440th sisyphus-ppcg 🇦🇺 821 28 60ms 1 Dec 2023 441st DialFrost 🇸🇬 821 79 70ms 24 Mar 2025 442nd ovs-code 🇩🇪 820 49 140ms 31 Dec 2023 443rd albanian-laundromat 819 97 3ms 16 days ago 444th stefangimmillaro 818 51 37ms 26 Apr 2024 444th Natanaelel 🇸🇪 818 51 38ms 24 Jan 2025 446th DialFrost 🇸🇬 818 64 135ms 3 Aug 2024 447th sisyphus-ppcg 🇦🇺 818 79 2ms 5 Dec 2023 448th alemelis 817 59 892ms 25 Feb 2024 449th sean-niemann 🇺🇸 817 63 1,265ms 24 Mar 2024 449th DialFrost 🇸🇬 817 63 1,260ms 18 Dec 2024 451st MeWhenI 🇻🇦 815 70 1,043ms 15 Sep 2025 452nd ovs-code 🇩🇪 815 77 2ms 15 Dec 2023 453rd targrik 814 68 283ms 29 Jan 2025 454th SirBogman 🇺🇸 812 69 11ms 1 Dec 2023 454th bizy-coder 812 69 10ms 1 Dec 2023 454th inventshah 812 69 13ms 1 Dec 2023 454th Shanethegamer 🇺🇸 812 69 12ms 1 Dec 2023 454th Alex-x90 🇺🇸 812 69 12ms 4 Dec 2023 454th prplz 🇦🇺 812 69 12ms 10 Dec 2023 454th sgiandomenico 812 69 13ms 18 Dec 2023 454th scpchicken 🇵🇼 812 69 12ms 28 Dec 2023 454th StefanHabel 🇨🇦 812 69 11ms 11 Feb 2024 454th IanUtley 812 69 11ms 14 Jun 2024 454th Bulmenisaurus 812 69 11ms 17 Jul 2024 454th edsrzf 🇳🇿 812 69 11ms 20 Dec 2024 454th KasperKivimaeki 🇫🇮 812 69 11ms 5 Jul 2025 454th blaztoma 🇱🇹 812 69 11ms 22 Nov 2025 454th acotis 812 69 12ms 11 Feb 2026 454th firegene 🇮🇪 812 69 11ms 24 Feb 2026 470th DialFrost 🇸🇬 812 92 4ms 14 Feb 2025 471st ovs-code 🇩🇪 809 66 434ms 15 Jan 2024 471st GrayJoKing 🇦🇺 809 66 417ms 15 Jan 2024 471st sisyphus-ppcg 🇦🇺 809 66 429ms 16 Jan 2024 471st m-tkach 🇺🇦 809 66 431ms 20 Jan 2024 475th GolfingSuccess 🇬🇷 809 67 2ms 16 Oct 2024 476th MeWhenI 🇻🇦 808 78 41ms 4 Dec 2023 477th MeWhenI 🇻🇦 808 90 2,837ms 24 Oct 2024 478th stefangimmillaro 807 83 39ms 26 Apr 2025 478th MeWhenI 🇻🇦 807 83 39ms 29 Apr 2025 480th ovs-code 🇩🇪 806 65 149ms 4 Aug 2024 First Prev 401–480 of 1,535 Next Last