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?
Inventory 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 1st GolfingSuccess 🇬🇷 1,000 20 73ms 19 Nov 2022 1st ovs-code 🇩🇪 1,000 20 67ms 20 Nov 2022 1st primo-ppcg 🇹🇭 1,000 20 66ms 25 Nov 2022 1st Lydxn 🇨🇦 1,000 20 67ms 20 Feb 2023 1st lynn 1,000 20 67ms 11 Oct 2023 1st MeWhenI 🇻🇦 1,000 20 69ms 5 May 2025 7th ovs-code 🇩🇪 994 21 3ms 21 Nov 2022 7th Bubbler-4 994 21 3ms 10 Jan 2023 7th bstrat 994 21 3ms 13 Jun 2024 7th Steffan153 🇫🇮 994 21 3ms 13 Aug 2024 7th 2bular 994 21 3ms 7 Sep 2024 7th zacjl 994 21 3ms 18 Sep 2024 7th GolfingSuccess 🇬🇷 994 21 3ms 20 Mar 2025 7th sean-niemann 🇺🇸 994 21 3ms 17 Apr 2025 15th Frowny 971 25 37ms 20 Nov 2022 15th Bubbler-4 971 25 36ms 22 Nov 2022 15th ovs-code 🇩🇪 971 25 42ms 4 Mar 2023 18th Lydxn 🇨🇦 967 51 39ms 21 Nov 2022 18th btnlq 967 51 37ms 25 Dec 2022 18th Steffan153 🇫🇮 967 51 36ms 29 Aug 2024 18th sean-niemann 🇺🇸 967 51 36ms 26 Dec 2024 18th khvdm 967 51 38ms 27 Mar 2025 18th JayXon 🇺🇸 967 51 38ms 24 Feb 2026 18th plcc0 967 51 34ms 25 days ago 18th kg583 🇺🇸 967 51 38ms 3 hours ago 26th GrayJoKing 🇦🇺 964 26 4ms 21 Nov 2022 27th sisyphus-ppcg 🇦🇺 961 28 170ms 20 Feb 2023 28th Steffan153 🇫🇮 952 21 105ms 13 Aug 2024 29th ovs-code 🇩🇪 951 38 45ms 20 Nov 2022 29th Steffan153 🇫🇮 951 38 42ms 14 Aug 2024 29th Natanaelel 🇸🇪 951 38 46ms 21 Jan 2025 29th sean-niemann 🇺🇸 951 38 44ms 1 Jul 2025 29th radarek 🇵🇱 951 38 47ms 26 Aug 2025 34th primo-ppcg 🇹🇭 950 34 4ms 25 Nov 2022 34th saito-ta 🇯🇵 950 34 4ms 7 Dec 2022 36th emplv 🇱🇻 950 52 11ms 25 Nov 2022 36th lukegustafson 🇺🇸 950 52 11ms 5 Mar 2024 36th vlpx 🇫🇮 950 52 10ms 18 Jun 2024 39th Natanaelel 🇸🇪 949 22 3ms 22 Jan 2025 39th GrayJoKing 🇦🇺 949 22 3ms 6 Jun 2025 39th copy 949 22 3ms 16 Feb 2026 42nd pardouin 🇫🇷 949 52 33ms 12 Jul 2024 43rd Lydxn 🇨🇦 937 50 440ms 16 Jan 2024 43rd sean-niemann 🇺🇸 937 50 451ms 12 Mar 2025 43rd JayXon 🇺🇸 937 50 349ms 24 Feb 2026 43rd Steffan153 🇫🇮 937 50 389ms 26 Feb 2026 43rd kg583 🇺🇸 937 50 387ms 3 hours ago 48th saito-ta 🇯🇵 935 40 6ms 23 Jul 2024 49th Lydxn 🇨🇦 935 41 1,258ms 20 Feb 2023 49th Steffan153 🇫🇮 935 41 1,314ms 14 Aug 2024 49th sean-niemann 🇺🇸 935 41 1,301ms 1 Jul 2025 52nd clockworknazo 934 43 1ms 21 Nov 2022 52nd primo-ppcg 🇹🇭 934 43 1ms 24 Nov 2022 52nd Lydxn 🇨🇦 934 43 1ms 27 Jun 2023 52nd xsot 🇸🇬 934 43 4ms 14 Apr 2024 52nd xsot 🇸🇬 934 43 5ms 24 May 2025 52nd targrik 934 43 6ms 26 May 2025 52nd canissimia 🇦🇶 934 43 2ms 4 Dec 2025 59th rhdqor213 934 62 2ms 22 Jul 2024 60th nwellnhof 🇩🇪 933 44 249ms 29 Oct 2024 61st orthoplex 🇨🇽 931 53 32ms 20 Nov 2022 61st GolfingSuccess 🇬🇷 931 53 40ms 20 Nov 2022 61st m-tkach 🇺🇦 931 53 20ms 3 Apr 2024 64th lukegustafson 🇺🇸 930 42 136ms 26 Sep 2024 65th sisyphus-ppcg 🇦🇺 923 35 4ms 22 Nov 2022 66th GrayJoKing 🇦🇺 922 47 42ms 16 Aug 2024 66th btnlq 922 47 40ms 22 Aug 2024 66th ovs-code 🇩🇪 922 47 40ms 30 Sep 2024 66th Steffan153 🇫🇮 922 47 39ms 13 days ago 70th snyderek 🇺🇸 921 83 71ms 20 Nov 2024 71st pardouin 🇫🇷 919 51 389ms 12 Jul 2024 72nd Lydxn 🇨🇦 919 63 2ms 20 Feb 2023 72nd KasperKivimaeki 🇫🇮 919 63 2ms 22 Jul 2024 72nd xsot 🇸🇬 919 63 2ms 22 Jul 2024 72nd saito-ta 🇯🇵 919 63 2ms 23 Jul 2024 72nd JohandeRuiter 🇳🇱 919 63 2ms 28 Aug 2024 77th JayXon 🇺🇸 918 53 600ms 4 Apr 2023 77th Lydxn 🇨🇦 918 53 649ms 27 Jun 2023 77th ovs-code 🇩🇪 918 53 452ms 10 May 2024 80th Lydxn 🇨🇦 917 82 439ms 24 Jun 2023 1–80 of 1,668 Next Last