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 chars. 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 Chars Time Submitted 320th Shanethegamer 🇺🇸 869 88 60ms 22 Nov 2022 320th ovs-code 🇩🇪 869 88 56ms 3 Jun 2024 320th luuumine 🇫🇷 869 88 61ms 17 Nov 2025 324th nwellnhof 🇩🇪 868 31 242ms 25 Jun 2023 325th neel11235813 868 54 400ms 27 Mar 2024 325th DialFrost 🇸🇬 868 54 387ms 2 Aug 2024 325th lifthrasiir 🇰🇷 868 54 429ms 2 Dec 2024 325th ovs-code 🇩🇪 868 54 483ms 15 Jul 2025 329th Natanaelel 🇸🇪 867 28 34ms 3 Nov 2023 329th SirBogman 🇺🇸 867 28 35ms 14 Feb 2024 331st didion0 🇺🇸 867 57 12ms 22 Feb 2023 331st voytxt 🇨🇿 867 57 10ms 19 May 2023 331st stefangimmillaro 867 57 12ms 23 Sep 2023 331st emgordon154 867 57 11ms 17 Nov 2025 331st Lv0Sys 🇵🇱 867 57 11ms 25 Feb 2026 336th primo-ppcg 🇹🇭 867 167 12ms 13 Aug 2025 337th HPWiz 🇳🇿 866 57 12ms 20 Nov 2022 337th nwellnhof 🇩🇪 866 57 11ms 21 Nov 2022 337th jakobkordez 🇸🇮 866 57 12ms 22 Nov 2022 337th FlorianCassayre 🇫🇷 866 57 43ms 6 Jan 2023 337th stefangimmillaro 866 57 11ms 29 Apr 2023 337th bizy-coder 866 57 13ms 1 Sep 2024 337th Seek64 🇩🇪 866 57 12ms 18 Nov 2025 337th sunleonid 866 57 34ms 25 Dec 2025 337th ryyyn 🇺🇸 866 57 11ms 30 Dec 2025 337th edsrzf 🇳🇿 866 57 35ms 6 hours ago 347th janbehrens 🇩🇪 866 84 459ms 21 Nov 2022 348th GrayJoKing 🇦🇺 865 68 4ms 12 Feb 2023 349th janbehrens 🇩🇪 864 67 2ms 20 Nov 2022 349th GrayJoKing 🇦🇺 864 67 2ms 20 Feb 2023 349th MeWhenI 🇻🇦 864 67 2ms 22 Jul 2024 349th Shanethegamer 🇺🇸 864 67 2ms 28 May 2025 349th Alex-x90 🇺🇸 864 67 2ms 18 Oct 2025 349th solisolu 864 67 3ms 12 days ago 355th jared-hughes 864 102 8ms 7 Jul 2024 356th Shanethegamer 🇺🇸 864 162 1,481ms 5 Apr 2025 357th MeWhenI 🇻🇦 863 64 3ms 10 Oct 2023 358th JayXon 🇺🇸 863 72 2ms 23 Nov 2022 358th sean-niemann 🇺🇸 863 72 42ms 23 Apr 2023 358th kg583 🇺🇸 863 72 52ms 9 hours ago 361st DialFrost 🇸🇬 862 64 151ms 20 Nov 2025 362nd Waffle3z 862 72 2ms 11 Dec 2022 362nd jared-hughes 862 72 2ms 16 Mar 2023 362nd edsrzf 🇳🇿 862 72 2ms 27 Aug 2025 365th GrayJoKing 🇦🇺 861 42 42ms 21 Nov 2022 365th JayXon 🇺🇸 861 42 48ms 22 Nov 2022 365th pardouin 🇫🇷 861 42 50ms 2 Sep 2025 368th primo-ppcg 🇹🇭 861 54 71ms 24 Sep 2023 369th GrayJoKing 🇦🇺 861 67 249ms 22 Aug 2023 370th kg583 🇺🇸 861 103 4,994ms 10 hours ago 371st Steffan153 🇫🇮 860 83 10ms 7 days ago 372nd m-tkach 🇺🇦 860 101 25ms 20 Nov 2022 373rd GrayJoKing 🇦🇺 859 89 57ms 1 Dec 2022 373rd Alex-x90 🇺🇸 859 89 53ms 20 Nov 2024 375th SirBogman 🇺🇸 857 77 39ms 22 Nov 2022 375th primo-ppcg 🇹🇭 857 77 42ms 24 Nov 2022 377th emplv 🇱🇻 856 111 300ms 26 Jul 2023 378th MeWhenI 🇻🇦 855 48 278ms 22 Jul 2024 378th Steffan153 🇫🇮 855 48 293ms 9 Aug 2024 380th stefangimmillaro 855 77 100ms 5 Jun 2023 381st Shanethegamer 🇺🇸 855 85 461ms 22 Nov 2022 381st MeWhenI 🇻🇦 855 85 439ms 22 Jul 2024 381st DialFrost 🇸🇬 855 85 459ms 20 Nov 2025 384th janbehrens 🇩🇪 854 47 6ms 20 Nov 2022 385th elgan65536 🇺🇸 853 101 122ms 10 Feb 2026 386th Natanaelel 🇸🇪 852 45 1,359ms 22 Jan 2025 387th lynn 852 55 443ms 17 Feb 2024 387th duckyluuk 🇳🇱 852 55 422ms 28 Aug 2024 387th Babafaba 852 55 467ms 7 Nov 2025 387th snoozingnewt 🇨🇦 852 55 418ms 13 Feb 2026 391st itsh01 852 58 11ms 21 Nov 2022 391st prplz 🇦🇺 852 58 12ms 25 Nov 2022 391st Larento 852 58 10ms 13 Oct 2023 394th GolfingSuccess 🇬🇷 852 68 2ms 20 Nov 2022 394th ZakkkkAttackkkk 🇵🇭 852 68 2ms 12 Aug 2023 394th luuumine 🇫🇷 852 68 2ms 17 Nov 2025 394th prestosilver 🇺🇸 852 68 2ms 12 Dec 2025 398th annaproxy 852 81 64ms 11 Dec 2022 399th janbehrens 🇩🇪 851 58 30ms 21 Nov 2022 399th sisyphus-ppcg 🇦🇺 851 58 11ms 22 Nov 2022 First Prev 321–400 of 1,669 Next Last