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 bytes. 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 Bytes Time Submitted 81st ovs-code 🇩🇪 917 54 436ms 10 May 2024 82nd Lydxn 🇨🇦 917 82 439ms 24 Jun 2023 83rd Lydxn 🇨🇦 915 54 11ms 22 Nov 2022 83rd Irratix 🇳🇱 915 54 10ms 22 Nov 2022 83rd dmrichwa 🇺🇸 915 54 10ms 25 Nov 2022 83rd JayXon 🇺🇸 915 54 10ms 1 Dec 2022 83rd nwellnhof 🇩🇪 915 54 9ms 24 Jun 2023 83rd targrik 915 54 12ms 7 Apr 2025 89th orthoplex 🇨🇽 915 57 11ms 20 Nov 2022 89th HPWiz 🇳🇿 915 57 12ms 20 Nov 2022 89th GrayJoKing 🇦🇺 915 57 11ms 21 Nov 2022 89th nwellnhof 🇩🇪 915 57 11ms 21 Nov 2022 89th SirBogman 🇺🇸 915 57 11ms 22 Nov 2022 89th xsot 🇸🇬 915 57 11ms 25 Mar 2023 89th stefangimmillaro 915 57 11ms 29 Apr 2023 89th bizy-coder 915 57 13ms 1 Sep 2024 89th Seek64 🇩🇪 915 57 12ms 18 Nov 2025 89th sunleonid 915 57 34ms 25 Dec 2025 89th ryyyn 🇺🇸 915 57 11ms 30 Dec 2025 89th edsrzf 🇳🇿 915 57 35ms 2 hours ago 101st primo-ppcg 🇹🇭 913 42 1,269ms 22 Nov 2022 102nd primo-ppcg 🇹🇭 913 44 6ms 21 Nov 2022 102nd sisyphus-ppcg 🇦🇺 913 44 6ms 22 Nov 2022 102nd clockworknazo 913 44 5ms 22 Nov 2022 102nd Lydxn 🇨🇦 913 44 5ms 26 Jun 2023 102nd Steffan153 🇫🇮 913 44 6ms 15 Aug 2024 102nd sean-niemann 🇺🇸 913 44 5ms 9 Jan 2025 102nd emplv 🇱🇻 913 44 6ms 24 May 2025 109th DialFrost 🇸🇬 913 48 1,229ms 1 Sep 2025 109th xsot 🇸🇬 913 48 1,076ms 22 Nov 2025 111th JayXon 🇺🇸 913 68 2ms 19 Feb 2023 111th Lydxn 🇨🇦 913 68 2ms 25 Jun 2023 111th Steffan153 🇫🇮 913 68 2ms 14 Aug 2024 111th sean-niemann 🇺🇸 913 68 2ms 5 Jul 2025 115th error256 912 51 64ms 11 Dec 2025 116th primo-ppcg 🇹🇭 912 57 25ms 20 Jan 2023 116th zacjl 912 57 28ms 17 Jan 2025 116th edsrzf 🇳🇿 912 57 24ms 9 hours ago 116th kg583 🇺🇸 912 57 25ms 8 hours ago 120th Lydxn 🇨🇦 912 71 193ms 27 Jun 2023 121st sean-niemann 🇺🇸 911 87 482ms 26 Sep 2025 121st JayXon 🇺🇸 911 87 452ms 26 Sep 2025 123rd ovs-code 🇩🇪 910 54 110ms 8 Dec 2025 124th JayXon 🇺🇸 910 84 60ms 6 Dec 2022 124th Lydxn 🇨🇦 910 84 57ms 20 Feb 2023 124th xsot 🇸🇬 910 84 63ms 22 Jul 2024 124th BlankSpruce 910 84 65ms 15 Apr 2025 124th KasperKivimaeki 🇫🇮 910 84 58ms 13 Nov 2025 129th rak1507 🇬🇧 908 23 3ms 31 Aug 2023 129th SirBogman 🇺🇸 908 23 3ms 14 Feb 2024 131st JayXon 🇺🇸 907 95 124ms 6 Dec 2022 131st kumavale 907 95 128ms 13 Nov 2025 133rd MeWhenI 🇻🇦 906 53 27ms 27 Dec 2024 133rd GrayJoKing 🇦🇺 906 53 24ms 7 Feb 2025 135th JayXon 🇺🇸 906 61 3ms 4 Feb 2024 135th Steffan153 🇫🇮 906 61 3ms 14 Aug 2024 135th sean-niemann 🇺🇸 906 61 3ms 26 Dec 2024 138th JayXon 🇺🇸 906 83 424ms 22 Nov 2022 138th nwellnhof 🇩🇪 906 83 377ms 25 Nov 2022 140th JayXon 🇺🇸 905 47 137ms 23 Oct 2024 141st JayXon 🇺🇸 905 65 2ms 22 Nov 2022 141st nwellnhof 🇩🇪 905 65 2ms 25 Nov 2022 141st 09cf 905 65 2ms 18 Oct 2023 141st Steffan153 🇫🇮 905 65 2ms 14 Aug 2024 141st sean-niemann 🇺🇸 905 65 2ms 9 May 2025 146th Lydxn 🇨🇦 904 40 48ms 22 Feb 2023 147th Lydxn 🇨🇦 904 61 143ms 27 Jun 2023 148th JayXon 🇺🇸 904 73 128ms 25 Jun 2023 148th GrayJoKing 🇦🇺 904 73 128ms 25 Jun 2023 148th Steffan153 🇫🇮 904 73 151ms 15 Aug 2024 148th sean-niemann 🇺🇸 904 73 154ms 17 Jun 2025 148th edsrzf 🇳🇿 904 73 424ms 7 hours ago 153rd clockworknazo 903 67 4ms 30 Aug 2023 154th Steffan153 🇫🇮 902 64 43ms 3 days ago 154th edsrzf 🇳🇿 902 64 26ms 8 hours ago 156th ovs-code 🇩🇪 901 55 419ms 15 Jan 2024 156th GolfingSuccess 🇬🇷 901 55 384ms 15 Jan 2024 156th Lydxn 🇨🇦 901 55 417ms 16 Jan 2024 156th lynn 901 55 443ms 17 Feb 2024 156th Steffan153 🇫🇮 901 55 458ms 13 Aug 2024 First Prev 81–160 of 1,685 Next Last