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 321st Natanaelel 🇸🇪 867 28 34ms 3 Nov 2023 321st SirBogman 🇺🇸 867 28 35ms 14 Feb 2024 323rd didion0 🇺🇸 867 57 12ms 22 Feb 2023 323rd voytxt 🇨🇿 867 57 10ms 19 May 2023 323rd stefangimmillaro 867 57 12ms 23 Sep 2023 323rd emgordon154 867 57 11ms 17 Nov 2025 323rd Lv0Sys 🇵🇱 867 57 11ms 25 Feb 2026 328th primo-ppcg 🇹🇭 867 167 12ms 13 Aug 2025 329th HPWiz 🇳🇿 866 57 12ms 20 Nov 2022 329th nwellnhof 🇩🇪 866 57 11ms 21 Nov 2022 329th jakobkordez 🇸🇮 866 57 12ms 22 Nov 2022 329th FlorianCassayre 🇫🇷 866 57 43ms 6 Jan 2023 329th stefangimmillaro 866 57 11ms 29 Apr 2023 329th bizy-coder 866 57 13ms 1 Sep 2024 329th Seek64 🇩🇪 866 57 12ms 18 Nov 2025 329th sunleonid 866 57 34ms 25 Dec 2025 329th ryyyn 🇺🇸 866 57 11ms 30 Dec 2025 338th janbehrens 🇩🇪 866 84 459ms 21 Nov 2022 339th GrayJoKing 🇦🇺 865 68 4ms 12 Feb 2023 340th janbehrens 🇩🇪 864 67 2ms 20 Nov 2022 340th GrayJoKing 🇦🇺 864 67 2ms 20 Feb 2023 340th MeWhenI 🇻🇦 864 67 2ms 22 Jul 2024 340th Shanethegamer 🇺🇸 864 67 2ms 28 May 2025 340th Alex-x90 🇺🇸 864 67 2ms 18 Oct 2025 340th solisolu 864 67 3ms 12 days ago 346th jared-hughes 864 102 8ms 7 Jul 2024 347th Shanethegamer 🇺🇸 864 162 1,424ms 5 Apr 2025 348th MeWhenI 🇻🇦 863 64 3ms 10 Oct 2023 349th JayXon 🇺🇸 863 72 2ms 23 Nov 2022 349th sean-niemann 🇺🇸 863 72 42ms 23 Apr 2023 351st DialFrost 🇸🇬 862 64 151ms 20 Nov 2025 352nd Waffle3z 862 72 2ms 11 Dec 2022 352nd jared-hughes 862 72 2ms 16 Mar 2023 352nd edsrzf 🇳🇿 862 72 2ms 27 Aug 2025 355th Steffan153 🇫🇮 862 102 4,960ms 6 days ago 356th GrayJoKing 🇦🇺 861 42 42ms 21 Nov 2022 356th JayXon 🇺🇸 861 42 48ms 22 Nov 2022 356th pardouin 🇫🇷 861 42 50ms 2 Sep 2025 359th primo-ppcg 🇹🇭 861 54 71ms 24 Sep 2023 360th GrayJoKing 🇦🇺 860 67 249ms 22 Aug 2023 361st Steffan153 🇫🇮 860 83 10ms 6 days ago 362nd m-tkach 🇺🇦 860 101 25ms 20 Nov 2022 363rd GrayJoKing 🇦🇺 859 89 57ms 1 Dec 2022 363rd Alex-x90 🇺🇸 859 89 53ms 20 Nov 2024 365th SirBogman 🇺🇸 857 77 39ms 22 Nov 2022 365th primo-ppcg 🇹🇭 857 77 42ms 24 Nov 2022 367th emplv 🇱🇻 856 111 300ms 26 Jul 2023 368th MeWhenI 🇻🇦 855 48 278ms 22 Jul 2024 368th Steffan153 🇫🇮 855 48 293ms 9 Aug 2024 370th stefangimmillaro 855 77 79ms 5 Jun 2023 371st Shanethegamer 🇺🇸 855 85 461ms 22 Nov 2022 371st MeWhenI 🇻🇦 855 85 439ms 22 Jul 2024 371st DialFrost 🇸🇬 855 85 459ms 20 Nov 2025 374th janbehrens 🇩🇪 854 47 6ms 20 Nov 2022 375th elgan65536 🇺🇸 853 101 124ms 10 Feb 2026 376th Natanaelel 🇸🇪 852 45 1,359ms 22 Jan 2025 377th lynn 852 55 443ms 17 Feb 2024 377th duckyluuk 🇳🇱 852 55 422ms 28 Aug 2024 377th Babafaba 852 55 467ms 7 Nov 2025 377th snoozingnewt 🇨🇦 852 55 418ms 13 Feb 2026 381st itsh01 852 58 11ms 21 Nov 2022 381st prplz 🇦🇺 852 58 12ms 25 Nov 2022 381st Larento 852 58 10ms 13 Oct 2023 384th GolfingSuccess 🇬🇷 852 68 2ms 20 Nov 2022 384th ZakkkkAttackkkk 🇵🇭 852 68 2ms 12 Aug 2023 384th luuumine 🇫🇷 852 68 2ms 17 Nov 2025 384th prestosilver 🇺🇸 852 68 2ms 12 Dec 2025 388th annaproxy 852 81 64ms 11 Dec 2022 389th janbehrens 🇩🇪 851 58 30ms 21 Nov 2022 389th sisyphus-ppcg 🇦🇺 851 58 11ms 22 Nov 2022 389th AlephSquirrel 851 58 31ms 9 Jan 2023 389th scpchicken 🇵🇼 851 58 30ms 10 Mar 2023 389th yzhs 🇩🇪 851 58 12ms 23 Jun 2023 389th 2011-Chan-Ethan 851 58 42ms 12 Jul 2023 389th MeWhenI 🇻🇦 851 58 11ms 22 Jul 2024 389th 5cw 🇺🇸 851 58 29ms 6 Nov 2024 389th Natanaelel 🇸🇪 851 58 11ms 15 Jul 2025 389th blaztoma 🇱🇹 851 58 11ms 17 Aug 2025 389th Emutis 🇱🇹 851 58 12ms 21 Aug 2025 389th InigoK 🇺🇸 851 58 11ms 4 Sep 2025 First Prev 321–400 of 1,664 Next Last