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 319th Steffan153 🇫🇮 877 50 842ms 13 Feb 2026 322nd ovs-code 🇩🇪 876 83 455ms 23 Jul 2024 323rd primo-ppcg 🇹🇭 875 71 40ms 24 Nov 2022 323rd Steffan153 🇫🇮 875 71 40ms 9 Apr 2023 323rd edsrzf 🇳🇿 875 71 27ms 14 hours ago 326th primo-ppcg 🇹🇭 874 66 251ms 30 Apr 2023 326th Lydxn 🇨🇦 874 66 251ms 28 Aug 2023 326th kg583 🇺🇸 874 66 249ms 16 hours ago 329th janbehrens 🇩🇪 874 86 375ms 20 Nov 2022 329th tomtheisen 🇺🇸 874 86 374ms 4 Dec 2022 329th MeWhenI 🇻🇦 874 86 391ms 8 Dec 2022 329th annaproxy 874 86 374ms 11 Dec 2022 329th AdrienHache 🇫🇷 874 86 422ms 17 Dec 2024 329th Yax42 🇫🇷 874 86 398ms 31 May 2025 329th DialFrost 🇸🇬 874 86 426ms 20 Nov 2025 336th Steffan153 🇫🇮 874 96 1,287ms 10 Apr 2023 337th canissimia 🇦🇶 874 130 1,802ms 6 Mar 2023 338th HPWiz 🇳🇿 873 37 3ms 22 Nov 2022 339th dvargas46 🇺🇸 873 46 1ms 21 Nov 2022 339th DialFrost 🇸🇬 873 46 2ms 20 Nov 2025 341st duckyluuk 🇳🇱 873 55 16ms 17 Dec 2024 341st DialFrost 🇸🇬 873 55 15ms 17 Dec 2024 343rd GrayJoKing 🇦🇺 873 79 93ms 11 Dec 2022 344th pardouin 🇫🇷 872 76 2,599ms 12 Sep 2025 345th m-tkach 🇺🇦 872 143 201ms 1 Apr 2023 346th JayXon 🇺🇸 871 44 1,261ms 19 Feb 2023 346th stefangimmillaro 871 44 1,296ms 29 Apr 2023 348th lifthrasiir 🇰🇷 870 24 2ms 28 Nov 2024 349th primo-ppcg 🇹🇭 870 43 6ms 21 Nov 2022 349th Steffan153 🇫🇮 870 43 6ms 14 Aug 2024 351st OllieBoyne 🇬🇧 870 60 34ms 6 Dec 2022 351st yzhs 🇩🇪 870 60 11ms 23 Jun 2023 351st AlexanderFair 870 60 33ms 2 Jul 2023 351st ndren 870 60 35ms 11 Aug 2023 351st bzijlema 🇳🇱 870 60 33ms 11 Nov 2023 351st elgan65536 🇺🇸 870 60 12ms 30 Mar 2024 351st ahmetdemirag 🇨🇾 870 60 30ms 21 Jul 2024 351st jatloe 870 60 34ms 27 Sep 2024 351st ZakkkkAttackkkk 🇵🇭 870 60 10ms 5 Feb 2025 351st BlankSpruce 870 60 11ms 26 Apr 2025 351st jipsong 🇩🇪 870 60 41ms 13 Jun 2025 351st albanian-laundromat 870 60 33ms 9 Aug 2025 351st qpwoeirut 870 60 32ms 13 Aug 2025 351st CommandLeo 🇮🇹 870 60 33ms 7 Jan 2026 351st 051 🇸🇬 870 60 34ms 8 Jan 2026 366th GrayJoKing 🇦🇺 870 82 9ms 7 days ago 367th Steffan153 🇫🇮 870 102 4,960ms 6 days ago 367th edsrzf 🇳🇿 870 102 4,936ms 10 hours ago 369th JayXon 🇺🇸 870 160 1,642ms 15 Sep 2025 370th m-tkach 🇺🇦 869 57 433ms 21 Jan 2024 370th MeWhenI 🇻🇦 869 57 427ms 22 Jul 2024 370th lifthrasiir 🇰🇷 869 57 455ms 3 Dec 2024 373rd Shanethegamer 🇺🇸 869 76 128ms 21 Jun 2024 374th GolfingSuccess 🇬🇷 869 88 60ms 20 Nov 2022 374th Shanethegamer 🇺🇸 869 88 60ms 22 Nov 2022 374th ovs-code 🇩🇪 869 88 56ms 3 Jun 2024 374th luuumine 🇫🇷 869 88 61ms 17 Nov 2025 378th MeWhenI 🇻🇦 868 87 26ms 23 Feb 2026 379th Natanaelel 🇸🇪 867 28 34ms 3 Nov 2023 379th SirBogman 🇺🇸 867 28 35ms 14 Feb 2024 381st didion0 🇺🇸 867 57 12ms 22 Feb 2023 381st voytxt 🇨🇿 867 57 10ms 19 May 2023 381st stefangimmillaro 867 57 12ms 23 Sep 2023 381st emgordon154 867 57 11ms 17 Nov 2025 381st Lv0Sys 🇵🇱 867 57 11ms 25 Feb 2026 386th primo-ppcg 🇹🇭 867 167 12ms 13 Aug 2025 387th janbehrens 🇩🇪 866 84 459ms 21 Nov 2022 388th GolfingSuccess 🇬🇷 865 68 2ms 20 Nov 2022 388th Shanethegamer 🇺🇸 865 68 2ms 22 Nov 2022 388th luuumine 🇫🇷 865 68 2ms 17 Nov 2025 388th prestosilver 🇺🇸 865 68 2ms 12 Dec 2025 392nd jared-hughes 864 102 8ms 7 Jul 2024 393rd Shanethegamer 🇺🇸 864 162 1,481ms 5 Apr 2025 394th MeWhenI 🇻🇦 863 64 3ms 10 Oct 2023 395th JayXon 🇺🇸 863 72 2ms 23 Nov 2022 395th sean-niemann 🇺🇸 863 72 42ms 23 Apr 2023 395th kg583 🇺🇸 863 72 52ms 13 hours ago 398th DialFrost 🇸🇬 862 64 151ms 20 Nov 2025 399th Waffle3z 862 72 2ms 11 Dec 2022 399th jared-hughes 862 72 2ms 16 Mar 2023 First Prev 321–400 of 1,685 Next Last