The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 320th sean-niemann 🇺🇸 877 50 758ms 6 Dec 2025 320th Steffan153 🇫🇮 877 50 842ms 13 Feb 2026 323rd edsrzf 🇳🇿 877 70 31ms 11 hours ago 324th ovs-code 🇩🇪 876 83 455ms 23 Jul 2024 325th primo-ppcg 🇹🇭 875 71 40ms 24 Nov 2022 325th Steffan153 🇫🇮 875 71 40ms 9 Apr 2023 327th primo-ppcg 🇹🇭 874 66 251ms 30 Apr 2023 327th Lydxn 🇨🇦 874 66 251ms 28 Aug 2023 327th kg583 🇺🇸 874 66 249ms 2 days ago 330th janbehrens 🇩🇪 874 86 375ms 20 Nov 2022 330th tomtheisen 🇺🇸 874 86 374ms 4 Dec 2022 330th MeWhenI 🇻🇦 874 86 391ms 8 Dec 2022 330th annaproxy 874 86 374ms 11 Dec 2022 330th AdrienHache 🇫🇷 874 86 422ms 17 Dec 2024 330th Yax42 🇫🇷 874 86 398ms 31 May 2025 330th DialFrost 🇸🇬 874 86 426ms 20 Nov 2025 337th Steffan153 🇫🇮 874 96 1,287ms 10 Apr 2023 338th canissimia 🇦🇶 874 130 1,802ms 6 Mar 2023 339th HPWiz 🇳🇿 873 37 3ms 22 Nov 2022 340th dvargas46 🇺🇸 873 46 1ms 21 Nov 2022 340th DialFrost 🇸🇬 873 46 2ms 20 Nov 2025 342nd duckyluuk 🇳🇱 873 55 16ms 17 Dec 2024 342nd DialFrost 🇸🇬 873 55 15ms 17 Dec 2024 344th GrayJoKing 🇦🇺 873 79 93ms 11 Dec 2022 345th pardouin 🇫🇷 872 76 2,599ms 12 Sep 2025 346th m-tkach 🇺🇦 872 143 201ms 1 Apr 2023 347th JayXon 🇺🇸 871 44 1,261ms 19 Feb 2023 347th stefangimmillaro 871 44 1,296ms 29 Apr 2023 349th lifthrasiir 🇰🇷 870 24 2ms 28 Nov 2024 350th primo-ppcg 🇹🇭 870 43 6ms 21 Nov 2022 350th Steffan153 🇫🇮 870 43 6ms 14 Aug 2024 352nd OllieBoyne 🇬🇧 870 60 34ms 6 Dec 2022 352nd yzhs 🇩🇪 870 60 11ms 23 Jun 2023 352nd AlexanderFair 870 60 33ms 2 Jul 2023 352nd ndren 870 60 35ms 11 Aug 2023 352nd bzijlema 🇳🇱 870 60 33ms 11 Nov 2023 352nd elgan65536 🇺🇸 870 60 12ms 30 Mar 2024 352nd ahmetdemirag 🇨🇾 870 60 30ms 21 Jul 2024 352nd jatloe 870 60 34ms 27 Sep 2024 352nd ZakkkkAttackkkk 🇵🇭 870 60 10ms 5 Feb 2025 352nd BlankSpruce 870 60 11ms 26 Apr 2025 352nd jipsong 🇩🇪 870 60 41ms 13 Jun 2025 352nd albanian-laundromat 870 60 33ms 9 Aug 2025 352nd qpwoeirut 870 60 32ms 13 Aug 2025 352nd CommandLeo 🇮🇹 870 60 33ms 7 Jan 2026 352nd 051 🇸🇬 870 60 34ms 8 Jan 2026 352nd Googolplexo 🇷🇺 870 60 35ms 62 mins ago 368th GrayJoKing 🇦🇺 870 82 9ms 8 days ago 369th Steffan153 🇫🇮 870 102 4,960ms 8 days ago 369th edsrzf 🇳🇿 870 102 4,936ms 2 days ago 371st JayXon 🇺🇸 870 160 1,642ms 15 Sep 2025 372nd m-tkach 🇺🇦 869 57 433ms 21 Jan 2024 372nd MeWhenI 🇻🇦 869 57 427ms 22 Jul 2024 372nd lifthrasiir 🇰🇷 869 57 455ms 3 Dec 2024 375th Shanethegamer 🇺🇸 869 76 128ms 21 Jun 2024 376th GolfingSuccess 🇬🇷 869 88 60ms 20 Nov 2022 376th Shanethegamer 🇺🇸 869 88 60ms 22 Nov 2022 376th ovs-code 🇩🇪 869 88 56ms 3 Jun 2024 376th luuumine 🇫🇷 869 88 61ms 17 Nov 2025 380th MeWhenI 🇻🇦 868 87 26ms 23 Feb 2026 381st Natanaelel 🇸🇪 867 28 34ms 3 Nov 2023 381st SirBogman 🇺🇸 867 28 35ms 14 Feb 2024 383rd didion0 🇺🇸 867 57 12ms 22 Feb 2023 383rd voytxt 🇨🇿 867 57 10ms 19 May 2023 383rd stefangimmillaro 867 57 12ms 23 Sep 2023 383rd emgordon154 867 57 11ms 17 Nov 2025 383rd Lv0Sys 🇵🇱 867 57 11ms 25 Feb 2026 388th primo-ppcg 🇹🇭 867 167 12ms 13 Aug 2025 389th janbehrens 🇩🇪 866 84 459ms 21 Nov 2022 390th GolfingSuccess 🇬🇷 865 68 2ms 20 Nov 2022 390th Shanethegamer 🇺🇸 865 68 2ms 22 Nov 2022 390th luuumine 🇫🇷 865 68 2ms 17 Nov 2025 390th prestosilver 🇺🇸 865 68 2ms 12 Dec 2025 394th jared-hughes 864 102 8ms 7 Jul 2024 395th Shanethegamer 🇺🇸 864 162 1,481ms 5 Apr 2025 396th MeWhenI 🇻🇦 863 64 3ms 10 Oct 2023 397th JayXon 🇺🇸 863 72 2ms 23 Nov 2022 397th sean-niemann 🇺🇸 863 72 42ms 23 Apr 2023 399th DialFrost 🇸🇬 862 64 151ms 20 Nov 2025 400th Waffle3z 862 72 2ms 11 Dec 2022 First Prev 321–400 of 1,687 Next Last