The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 241st Lydxn 🇨🇦 890 42 8ms 25 Jan 2023 242nd Steffan153 🇫🇮 890 68 4ms 12 Feb 2023 243rd JayXon 🇺🇸 890 74 101ms 22 Jan 2025 244th zacjl 889 69 39ms 15 Dec 2024 245th m-tkach 🇺🇦 889 86 59ms 21 Nov 2022 245th sisyphus-ppcg 🇦🇺 889 86 60ms 22 Nov 2022 245th tailorspy 889 86 59ms 23 Sep 2024 248th Steffan153 🇫🇮 888 73 114ms 15 Aug 2024 249th acotis 888 97 141ms 31 Mar 2025 250th m-tkach 🇺🇦 888 106 27ms 18 Jan 2024 250th Steffan153 🇫🇮 888 106 28ms 27 Aug 2024 252nd FlyingPenguin223 887 70 2ms 1 Dec 2024 252nd GrayJoKing 🇦🇺 887 70 2ms 11 Jul 2025 254th Sakisan 🇧🇪 887 73 174ms 22 Nov 2022 254th ovs-code 🇩🇪 887 73 171ms 22 Nov 2022 254th xnor-gate 887 73 171ms 23 Nov 2022 254th lynn 887 73 168ms 27 Jan 2023 254th Steffan153 🇫🇮 887 73 171ms 20 Feb 2023 254th jared-hughes 887 73 165ms 13 Sep 2023 260th JayXon 🇺🇸 887 82 454ms 22 Nov 2022 260th Steffan153 🇫🇮 887 82 475ms 14 Aug 2024 260th sean-niemann 🇺🇸 887 82 453ms 9 May 2025 263rd canissimia 🇦🇶 887 192 3ms 7 Dec 2022 264th GrayJoKing 🇦🇺 886 48 140ms 13 Aug 2024 264th emplv 🇱🇻 886 48 155ms 1 Nov 2024 266th Lydxn 🇨🇦 886 98 24ms 27 Jun 2023 267th bizy-coder 885 56 384ms 1 Sep 2024 268th GrayJoKing 🇦🇺 885 83 340ms 26 Jun 2023 268th JayXon 🇺🇸 885 83 317ms 27 Jun 2023 270th zacjl 885 84 53ms 14 Feb 2025 270th kg583 🇺🇸 885 84 56ms 35 hours ago 270th edsrzf 🇳🇿 885 84 54ms 29 hours ago 273rd Steffan153 🇫🇮 884 56 389ms 15 Aug 2024 274th andersk 🇺🇸 884 59 31ms 20 Nov 2022 274th bricknellj 884 59 29ms 1 Dec 2022 274th neel11235813 884 59 33ms 22 Feb 2023 274th btjones0 884 59 34ms 23 Feb 2023 274th gabrielsqw 884 59 12ms 17 Apr 2023 274th RYNO8 884 59 11ms 4 Sep 2023 274th inventshah 884 59 11ms 22 Jan 2024 274th davecame 884 59 34ms 14 Mar 2024 274th duckyluuk 🇳🇱 884 59 33ms 26 May 2024 274th Bulmenisaurus 884 59 33ms 22 Oct 2024 274th snydej 884 59 11ms 21 Nov 2024 274th lifthrasiir 🇰🇷 884 59 21ms 3 Dec 2024 274th CaedenHarper 🇨🇦 884 59 31ms 30 Dec 2024 274th elana-teal 884 59 12ms 20 Jun 2025 274th dirckvdende 884 59 11ms 11 Jul 2025 274th Babafaba 884 59 30ms 7 Nov 2025 274th Lv0Sys 🇵🇱 884 59 33ms 7 Dec 2025 274th Flekay 🇩🇪 884 59 32ms 12 Feb 2026 274th snoozingnewt 🇨🇦 884 59 31ms 13 Feb 2026 274th JOrE20 884 59 30ms 25 Feb 2026 274th aksyristos 884 59 34ms 19 hours ago 295th GrayJoKing 🇦🇺 884 74 8ms 23 Jul 2023 296th DialFrost 🇸🇬 884 75 453ms 25 Mar 2025 297th btnlq 884 85 362ms 11 Mar 2023 297th stefangimmillaro 884 85 387ms 1 Apr 2023 299th lyphyser 883 44 51ms 13 Jan 2024 300th lynn 883 95 1,357ms 17 Feb 2023 301st primo-ppcg 🇹🇭 882 41 46ms 25 Nov 2022 302nd janbehrens 🇩🇪 882 56 11ms 21 Nov 2022 302nd edsrzf 🇳🇿 882 56 11ms 27 Aug 2025 302nd JOrE20 882 56 11ms 25 Feb 2026 305th MeWhenI 🇻🇦 881 90 459ms 7 Nov 2025 306th ovs-code 🇩🇪 881 100 7ms 31 Mar 2023 307th GrayJoKing 🇦🇺 880 107 29ms 26 Jun 2023 308th janbehrens 🇩🇪 879 87 65ms 20 Nov 2022 308th MeWhenI 🇻🇦 879 87 58ms 22 Jul 2024 310th ovs-code 🇩🇪 879 98 135ms 21 Jun 2023 311th Steffan153 🇫🇮 878 56 95ms 15 Aug 2024 312th janbehrens 🇩🇪 878 67 2ms 20 Nov 2022 312th GrayJoKing 🇦🇺 878 67 2ms 20 Feb 2023 312th inventshah 878 67 2ms 3 Feb 2024 312th MeWhenI 🇻🇦 878 67 2ms 22 Jul 2024 312th Alex-x90 🇺🇸 878 67 2ms 18 Oct 2025 312th solisolu 878 67 2ms 13 days ago 318th MeWhenI 🇻🇦 878 75 100ms 8 Mar 2023 319th Steffan153 🇫🇮 878 96 114ms 28 Feb 2026 320th edsrzf 🇳🇿 877 50 1,106ms 22 Nov 2025 First Prev 241–320 of 1,687 Next Last