The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 hours. Why not try and solve them ahead of time?
Repeating Decimals 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 1st sisyphus-ppcg 🇦🇺 1,000 44 181ms 1 Feb 2023 1st GrayJoKing 🇦🇺 1,000 44 189ms 1 Feb 2023 1st nwellnhof 🇩🇪 1,000 44 191ms 17 Feb 2023 4th prplz 🇦🇺 978 45 170ms 1 Feb 2023 4th DialFrost 🇸🇬 978 45 178ms 1 Feb 2023 4th primo-ppcg 🇹🇭 978 45 244ms 1 Feb 2023 4th Steffan153 🇫🇮 978 45 176ms 3 Feb 2023 4th sean-niemann 🇺🇸 978 45 205ms 5 Feb 2023 4th neel11235813 978 45 168ms 5 Feb 2023 4th Lydxn 🇨🇦 978 45 267ms 5 Feb 2023 11th Steffan153 🇫🇮 971 57 67ms 3 Feb 2023 11th radarek 🇵🇱 971 57 69ms 12 Dec 2024 11th sean-niemann 🇺🇸 971 57 68ms 2 Aug 2025 14th Lydxn 🇨🇦 970 80 33ms 2 Oct 2023 14th sisyphus-ppcg 🇦🇺 970 80 18ms 3 Oct 2023 14th orthoplex 🇨🇽 970 80 36ms 3 Oct 2023 14th btnlq 970 80 18ms 3 Oct 2023 14th JayXon 🇺🇸 970 80 36ms 3 Oct 2023 14th Steffan153 🇫🇮 970 80 18ms 4 Oct 2023 14th kg583 🇺🇸 970 80 32ms 24 Oct 2023 14th GrayJoKing 🇦🇺 970 80 18ms 1 Nov 2023 14th hallvabo 🇳🇴 970 80 18ms 6 Nov 2023 14th ffao 🇧🇷 970 80 18ms 22 Nov 2023 14th pardouin 🇫🇷 970 80 21ms 11 Jul 2024 14th khvdm 970 80 18ms 17 Oct 2024 14th emgordon154 970 80 19ms 22 Oct 2024 14th sean-niemann 🇺🇸 970 80 19ms 27 Dec 2024 14th Seek64 🇩🇪 970 80 19ms 17 Feb 2025 14th sunleonid 970 80 22ms 27 Nov 2025 30th emgordon154 967 52 315ms 18 Nov 2025 31st SirBogman 🇺🇸 957 46 203ms 17 Feb 2023 31st Natanaelel 🇸🇪 957 46 196ms 7 Mar 2024 33rd sisyphus-ppcg 🇦🇺 956 61 659ms 1 Feb 2023 33rd saito-ta 🇯🇵 956 61 690ms 2 Feb 2023 33rd nwellnhof 🇩🇪 956 61 656ms 20 Feb 2023 33rd Steffan153 🇫🇮 956 61 61ms 21 Feb 2023 37th Lydxn 🇨🇦 955 58 67ms 17 Mar 2023 37th JayXon 🇺🇸 955 58 40ms 27 Dec 2024 37th pardouin 🇫🇷 955 58 48ms 11 Aug 2025 40th Lydxn 🇨🇦 947 79 427ms 16 Jan 2024 40th Steffan153 🇫🇮 947 79 400ms 16 Jan 2024 40th JayXon 🇺🇸 947 79 384ms 21 Jan 2024 40th kg583 🇺🇸 947 79 405ms 20 Feb 2024 40th pardouin 🇫🇷 947 79 420ms 11 Jul 2024 40th emgordon154 947 79 408ms 22 Oct 2024 40th sean-niemann 🇺🇸 947 79 420ms 27 Dec 2024 47th primo-ppcg 🇹🇭 940 62 911ms 1 Feb 2023 48th emplv 🇱🇻 939 102 45ms 3 Feb 2023 49th SirFireball3521 936 47 167ms 1 Feb 2023 49th lynn 936 47 174ms 1 Feb 2023 49th ovs-code 🇩🇪 936 47 187ms 5 Mar 2024 52nd GrayJoKing 🇦🇺 935 80 398ms 23 Jul 2024 53rd ovs-code 🇩🇪 924 71 3ms 2 Nov 2025 54th JayXon 🇺🇸 921 104 11ms 2 Feb 2023 54th vlpx 🇫🇮 921 104 141ms 19 Jun 2024 56th MarcMush 🇫🇷 918 89 736ms 13 Jan 2024 56th Shanethegamer 🇺🇸 918 89 527ms 26 May 2024 58th annaproxy 913 85 19ms 22 Oct 2023 59th scpchicken 🇵🇼 911 64 930ms 4 Feb 2023 60th zacjl 911 72 3ms 2 Nov 2025 61st bitsandbeyond 🇳🇱 910 92 433ms 23 Feb 2026 62nd JayXon 🇺🇸 908 90 560ms 30 Dec 2023 63rd JayXon 🇺🇸 905 91 142ms 21 Aug 2024 64th emgordon154 904 92 10ms 29 Jul 2025 64th kg583 🇺🇸 904 92 9ms 22 Aug 2025 64th edsrzf 🇳🇿 904 92 9ms 14 Dec 2025 67th sean-niemann 🇺🇸 900 92 2,429ms 14 Feb 2026 67th edsrzf 🇳🇿 900 92 1,471ms 15 Feb 2026 69th JRaspass 🇬🇧 898 49 220ms 1 Mar 2023 70th rhdqor213 897 156 2ms 2 Jan 2026 71st nwellnhof 🇩🇪 894 179 508ms 25 Sep 2025 72nd JayXon 🇺🇸 893 117 1,390ms 5 Mar 2025 72nd pardouin 🇫🇷 893 117 1,406ms 9 Aug 2025 74th canissimia 🇦🇶 891 103 8ms 8 Jan 2026 75th GrayJoKing 🇦🇺 890 130 57ms 23 Jul 2024 76th AdrienHache 🇫🇷 889 195 476ms 30 Jul 2025 77th emgordon154 885 118 1,387ms 4 Mar 2025 78th emplv 🇱🇻 885 142 35ms 7 Mar 2023 79th ovs-code 🇩🇪 884 205 437ms 19 Jul 2024 80th dvargas46 🇺🇸 881 116 599ms 12 Feb 2023 1–80 of 564 Next Last