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 Lydxn 🇨🇦 917 82 439ms 24 Jun 2023 82nd Lydxn 🇨🇦 915 54 11ms 22 Nov 2022 82nd Irratix 🇳🇱 915 54 10ms 22 Nov 2022 82nd dmrichwa 🇺🇸 915 54 10ms 25 Nov 2022 82nd JayXon 🇺🇸 915 54 10ms 1 Dec 2022 82nd nwellnhof 🇩🇪 915 54 9ms 24 Jun 2023 82nd targrik 915 54 12ms 7 Apr 2025 88th orthoplex 🇨🇽 915 57 11ms 20 Nov 2022 88th HPWiz 🇳🇿 915 57 12ms 20 Nov 2022 88th GrayJoKing 🇦🇺 915 57 11ms 21 Nov 2022 88th nwellnhof 🇩🇪 915 57 11ms 21 Nov 2022 88th SirBogman 🇺🇸 915 57 11ms 22 Nov 2022 88th xsot 🇸🇬 915 57 11ms 25 Mar 2023 88th stefangimmillaro 915 57 11ms 29 Apr 2023 88th kg583 🇺🇸 915 57 32ms 30 Oct 2023 88th bizy-coder 915 57 13ms 1 Sep 2024 88th Seek64 🇩🇪 915 57 12ms 18 Nov 2025 88th sunleonid 915 57 34ms 25 Dec 2025 88th ryyyn 🇺🇸 915 57 11ms 30 Dec 2025 100th primo-ppcg 🇹🇭 913 42 1,269ms 22 Nov 2022 101st primo-ppcg 🇹🇭 913 44 6ms 21 Nov 2022 101st sisyphus-ppcg 🇦🇺 913 44 6ms 22 Nov 2022 101st clockworknazo 913 44 5ms 22 Nov 2022 101st Lydxn 🇨🇦 913 44 5ms 26 Jun 2023 101st Steffan153 🇫🇮 913 44 6ms 15 Aug 2024 101st sean-niemann 🇺🇸 913 44 5ms 9 Jan 2025 101st emplv 🇱🇻 913 44 6ms 24 May 2025 108th DialFrost 🇸🇬 913 48 1,229ms 1 Sep 2025 108th xsot 🇸🇬 913 48 1,076ms 22 Nov 2025 110th JayXon 🇺🇸 913 68 2ms 19 Feb 2023 110th Lydxn 🇨🇦 913 68 2ms 25 Jun 2023 110th Steffan153 🇫🇮 913 68 2ms 14 Aug 2024 110th sean-niemann 🇺🇸 913 68 2ms 5 Jul 2025 114th error256 912 51 64ms 11 Dec 2025 115th primo-ppcg 🇹🇭 912 57 25ms 20 Jan 2023 115th zacjl 912 57 28ms 17 Jan 2025 115th edsrzf 🇳🇿 912 57 24ms 9 mins ago 118th Lydxn 🇨🇦 912 71 193ms 27 Jun 2023 119th sean-niemann 🇺🇸 911 87 482ms 26 Sep 2025 119th JayXon 🇺🇸 911 87 452ms 26 Sep 2025 121st ovs-code 🇩🇪 910 54 110ms 8 Dec 2025 122nd JayXon 🇺🇸 910 84 60ms 6 Dec 2022 122nd Lydxn 🇨🇦 910 84 57ms 20 Feb 2023 122nd xsot 🇸🇬 910 84 63ms 22 Jul 2024 122nd BlankSpruce 910 84 65ms 15 Apr 2025 122nd KasperKivimaeki 🇫🇮 910 84 58ms 13 Nov 2025 127th rak1507 🇬🇧 908 23 3ms 31 Aug 2023 127th SirBogman 🇺🇸 908 23 3ms 14 Feb 2024 129th JayXon 🇺🇸 907 95 135ms 6 Dec 2022 129th kumavale 907 95 124ms 13 Nov 2025 131st MeWhenI 🇻🇦 906 53 27ms 27 Dec 2024 131st GrayJoKing 🇦🇺 906 53 24ms 7 Feb 2025 133rd JayXon 🇺🇸 906 61 3ms 4 Feb 2024 133rd Steffan153 🇫🇮 906 61 3ms 14 Aug 2024 133rd sean-niemann 🇺🇸 906 61 3ms 26 Dec 2024 136th JayXon 🇺🇸 906 83 424ms 22 Nov 2022 136th nwellnhof 🇩🇪 906 83 377ms 25 Nov 2022 138th JayXon 🇺🇸 905 47 137ms 23 Oct 2024 139th JayXon 🇺🇸 905 65 2ms 22 Nov 2022 139th nwellnhof 🇩🇪 905 65 2ms 25 Nov 2022 139th 09cf 905 65 2ms 18 Oct 2023 139th Steffan153 🇫🇮 905 65 2ms 14 Aug 2024 139th sean-niemann 🇺🇸 905 65 2ms 9 May 2025 144th Lydxn 🇨🇦 904 40 48ms 22 Feb 2023 145th Lydxn 🇨🇦 904 61 143ms 27 Jun 2023 146th JayXon 🇺🇸 904 73 128ms 25 Jun 2023 146th GrayJoKing 🇦🇺 904 73 128ms 25 Jun 2023 146th Steffan153 🇫🇮 904 73 151ms 15 Aug 2024 146th sean-niemann 🇺🇸 904 73 154ms 17 Jun 2025 150th clockworknazo 903 67 4ms 30 Aug 2023 151st ovs-code 🇩🇪 901 55 419ms 15 Jan 2024 151st GolfingSuccess 🇬🇷 901 55 384ms 15 Jan 2024 151st Lydxn 🇨🇦 901 55 417ms 16 Jan 2024 151st lynn 901 55 443ms 17 Feb 2024 151st Steffan153 🇫🇮 901 55 458ms 13 Aug 2024 151st sean-niemann 🇺🇸 901 55 444ms 12 Mar 2025 157th nwellnhof 🇩🇪 901 88 466ms 25 Sep 2025 157th namelessiw 901 88 374ms 2 Oct 2025 157th Steffan153 🇫🇮 901 88 380ms 11 Feb 2026 160th JayXon 🇺🇸 900 55 612ms 4 Apr 2023 First Prev 81–160 of 1,680 Next Last