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 81st Lydxn 🇨🇦 915 54 11ms 22 Nov 2022 81st Irratix 🇳🇱 915 54 10ms 22 Nov 2022 81st dmrichwa 🇺🇸 915 54 10ms 25 Nov 2022 81st JayXon 🇺🇸 915 54 10ms 1 Dec 2022 81st nwellnhof 🇩🇪 915 54 9ms 24 Jun 2023 81st targrik 915 54 12ms 7 Apr 2025 87th annaproxy 914 54 32ms 20 Nov 2022 87th SirBogman 🇺🇸 914 54 12ms 21 Nov 2022 87th hallvabo 🇳🇴 914 54 12ms 22 Nov 2022 87th xsot 🇸🇬 914 54 11ms 14 Apr 2023 87th GrayJoKing 🇦🇺 914 54 11ms 1 Nov 2023 87th anter69 🇭🇺 914 54 12ms 12 Jun 2024 87th DialFrost 🇸🇬 914 54 11ms 2 Aug 2024 87th emgordon154 914 54 12ms 17 May 2025 87th Mukundan314 914 54 36ms 21 Jun 2025 87th luuumine 🇫🇷 914 54 12ms 7 Nov 2025 87th CornerMercury 🇬🇧 914 54 31ms 16 Dec 2025 98th primo-ppcg 🇹🇭 913 42 1,269ms 22 Nov 2022 99th primo-ppcg 🇹🇭 913 44 6ms 21 Nov 2022 99th sisyphus-ppcg 🇦🇺 913 44 6ms 22 Nov 2022 99th clockworknazo 913 44 5ms 22 Nov 2022 99th Lydxn 🇨🇦 913 44 5ms 26 Jun 2023 99th Steffan153 🇫🇮 913 44 6ms 15 Aug 2024 99th sean-niemann 🇺🇸 913 44 5ms 9 Jan 2025 99th emplv 🇱🇻 913 44 6ms 24 May 2025 106th DialFrost 🇸🇬 913 48 1,229ms 1 Sep 2025 106th xsot 🇸🇬 913 48 1,076ms 22 Nov 2025 108th JayXon 🇺🇸 913 68 2ms 19 Feb 2023 108th Lydxn 🇨🇦 913 68 2ms 25 Jun 2023 108th Steffan153 🇫🇮 913 68 2ms 14 Aug 2024 108th sean-niemann 🇺🇸 913 68 2ms 5 Jul 2025 112th error256 912 51 64ms 11 Dec 2025 113th primo-ppcg 🇹🇭 912 57 25ms 20 Jan 2023 113th zacjl 912 57 28ms 17 Jan 2025 113th edsrzf 🇳🇿 912 57 24ms 2 hours ago 113th kg583 🇺🇸 912 57 25ms 113 mins ago 117th Lydxn 🇨🇦 912 71 193ms 27 Jun 2023 118th sean-niemann 🇺🇸 911 87 482ms 26 Sep 2025 118th JayXon 🇺🇸 911 87 452ms 26 Sep 2025 120th ovs-code 🇩🇪 910 54 110ms 8 Dec 2025 121st JayXon 🇺🇸 910 84 60ms 6 Dec 2022 121st Lydxn 🇨🇦 910 84 57ms 20 Feb 2023 121st xsot 🇸🇬 910 84 63ms 22 Jul 2024 121st BlankSpruce 910 84 65ms 15 Apr 2025 121st KasperKivimaeki 🇫🇮 910 84 58ms 13 Nov 2025 126th rak1507 🇬🇧 908 23 3ms 31 Aug 2023 126th SirBogman 🇺🇸 908 23 3ms 14 Feb 2024 128th JayXon 🇺🇸 907 95 135ms 6 Dec 2022 128th kumavale 907 95 124ms 13 Nov 2025 130th MeWhenI 🇻🇦 906 53 27ms 27 Dec 2024 130th GrayJoKing 🇦🇺 906 53 24ms 7 Feb 2025 132nd JayXon 🇺🇸 906 61 3ms 4 Feb 2024 132nd Steffan153 🇫🇮 906 61 3ms 14 Aug 2024 132nd sean-niemann 🇺🇸 906 61 3ms 26 Dec 2024 135th JayXon 🇺🇸 906 83 424ms 22 Nov 2022 135th nwellnhof 🇩🇪 906 83 377ms 25 Nov 2022 137th JayXon 🇺🇸 905 64 2ms 22 Nov 2022 137th nwellnhof 🇩🇪 905 64 2ms 15 Dec 2022 137th 09cf 905 64 2ms 18 Oct 2023 137th sean-niemann 🇺🇸 905 64 2ms 28 Aug 2025 141st Lydxn 🇨🇦 904 40 48ms 22 Feb 2023 142nd Lydxn 🇨🇦 904 61 143ms 27 Jun 2023 143rd Steffan153 🇫🇮 904 65 5ms 12 Feb 2023 144th JayXon 🇺🇸 904 73 128ms 25 Jun 2023 144th GrayJoKing 🇦🇺 904 73 128ms 25 Jun 2023 144th Steffan153 🇫🇮 904 73 151ms 15 Aug 2024 144th sean-niemann 🇺🇸 904 73 154ms 17 Jun 2025 144th edsrzf 🇳🇿 904 73 424ms 63 mins ago 149th Steffan153 🇫🇮 902 64 43ms 3 days ago 149th edsrzf 🇳🇿 902 64 26ms 2 hours ago 151st GolfingSuccess 🇬🇷 901 52 505ms 25 Jan 2025 152nd nwellnhof 🇩🇪 901 88 466ms 25 Sep 2025 152nd namelessiw 901 88 374ms 2 Oct 2025 152nd Steffan153 🇫🇮 901 88 380ms 11 Feb 2026 155th GrayJoKing 🇦🇺 900 69 41ms 21 Nov 2022 155th Lydxn 🇨🇦 900 69 41ms 24 Jun 2023 155th Lydxn 🇨🇦 900 69 39ms 27 Jun 2023 155th zacjl 900 69 39ms 15 Dec 2024 159th JayXon 🇺🇸 900 72 118ms 6 Dec 2022 160th nwellnhof 🇩🇪 900 85 53ms 25 Nov 2022 First Prev 81–160 of 1,667 Next Last