The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 161st annaproxy 900 58 33ms 20 Nov 2022 161st janbehrens 🇩🇪 900 58 30ms 21 Nov 2022 161st sisyphus-ppcg 🇦🇺 900 58 11ms 22 Nov 2022 161st hallvabo 🇳🇴 900 58 10ms 22 Nov 2022 161st AlephSquirrel 900 58 31ms 9 Jan 2023 161st scpchicken 🇵🇼 900 58 30ms 10 Mar 2023 161st anter69 🇭🇺 900 58 11ms 12 Jun 2024 161st MeWhenI 🇻🇦 900 58 11ms 22 Jul 2024 161st DialFrost 🇸🇬 900 58 10ms 2 Aug 2024 161st 5cw 🇺🇸 900 58 29ms 6 Nov 2024 161st emgordon154 900 58 12ms 17 May 2025 161st Mukundan314 900 58 37ms 21 Jun 2025 161st Natanaelel 🇸🇪 900 58 11ms 15 Jul 2025 161st blaztoma 🇱🇹 900 58 11ms 17 Aug 2025 161st Emutis 🇱🇹 900 58 12ms 21 Aug 2025 161st InigoK 🇺🇸 900 58 11ms 4 Sep 2025 161st luuumine 🇫🇷 900 58 11ms 7 Nov 2025 161st BrunoVisnadi 🇧🇷 900 58 36ms 15 Dec 2025 161st CornerMercury 🇬🇧 900 58 30ms 16 Dec 2025 180th Steffan153 🇫🇮 900 64 43ms 16 hours ago 181st GrayJoKing 🇦🇺 900 69 41ms 21 Nov 2022 181st Lydxn 🇨🇦 900 69 41ms 24 Jun 2023 181st Lydxn 🇨🇦 900 69 39ms 27 Jun 2023 181st zacjl 900 69 39ms 15 Dec 2024 185th JayXon 🇺🇸 900 72 118ms 6 Dec 2022 186th nwellnhof 🇩🇪 900 85 58ms 25 Nov 2022 186th 09cf 900 85 57ms 18 Oct 2023 186th inventshah 900 85 57ms 3 Feb 2024 186th Steffan153 🇫🇮 900 85 53ms 14 Aug 2024 186th sean-niemann 🇺🇸 900 85 59ms 9 May 2025 191st 2bular 899 27 33ms 3 Sep 2025 192nd primo-ppcg 🇹🇭 898 55 11ms 25 Nov 2022 192nd ovs-code 🇩🇪 898 55 9ms 25 Nov 2022 192nd Steffan153 🇫🇮 898 55 10ms 24 Jan 2023 192nd MeWhenI 🇻🇦 898 55 10ms 1 Jul 2023 192nd DialFrost 🇸🇬 898 55 10ms 30 Jul 2024 192nd sean-niemann 🇺🇸 898 55 10ms 30 Jul 2024 192nd rucin93 🇵🇱 898 55 11ms 30 Jul 2024 192nd duckyluuk 🇳🇱 898 55 11ms 18 Oct 2024 192nd xsot 🇸🇬 898 55 14ms 24 May 2025 192nd GrayJoKing 🇦🇺 898 55 10ms 11 Jul 2025 192nd pardouin 🇫🇷 898 55 9ms 26 Jul 2025 203rd Lydxn 🇨🇦 898 81 462ms 25 Jun 2023 204th IanUtley 896 77 18ms 12 Dec 2022 205th JayXon 🇺🇸 896 106 288ms 22 Nov 2022 205th nwellnhof 🇩🇪 896 106 289ms 22 Nov 2022 205th stefangimmillaro 896 106 290ms 17 Jun 2023 205th Lydxn 🇨🇦 896 106 288ms 24 Jun 2023 205th Steffan153 🇫🇮 896 106 298ms 14 Aug 2024 205th sean-niemann 🇺🇸 896 106 275ms 17 Apr 2025 205th edsrzf 🇳🇿 896 106 294ms 27 Aug 2025 212th Steffan153 🇫🇮 895 84 399ms 14 Aug 2024 212th sean-niemann 🇺🇸 895 84 417ms 20 Jun 2025 212th namelessiw 895 84 440ms 14 Aug 2025 215th JayXon 🇺🇸 894 74 3,039ms 13 Nov 2024 216th GrayJoKing 🇦🇺 892 35 125ms 20 Feb 2023 216th nwellnhof 🇩🇪 892 35 259ms 25 Jun 2023 218th sisyphus-ppcg 🇦🇺 892 45 1ms 22 Nov 2022 218th Steffan153 🇫🇮 892 45 1ms 14 Aug 2024 218th sean-niemann 🇺🇸 892 45 1ms 9 May 2025 221st SirBogman 🇺🇸 892 46 272ms 21 Nov 2022 221st primo-ppcg 🇹🇭 892 46 252ms 22 Nov 2022 221st Lydxn 🇨🇦 892 46 289ms 24 Jun 2023 221st bitsandbeyond 🇳🇱 892 46 250ms 31 Dec 2025 225th Lydxn 🇨🇦 892 74 41ms 27 Jun 2023 225th stefangimmillaro 892 74 38ms 31 Oct 2024 227th GolfingSuccess 🇬🇷 891 62 9ms 16 Oct 2023 228th ovs-code 🇩🇪 891 66 2ms 20 Nov 2022 228th sisyphus-ppcg 🇦🇺 891 66 2ms 22 Nov 2022 228th m-tkach 🇺🇦 891 66 2ms 22 Nov 2022 228th BlankSpruce 891 66 2ms 16 Apr 2025 232nd stefangimmillaro 891 89 512ms 6 Oct 2025 232nd DialFrost 🇸🇬 891 89 352ms 20 Nov 2025 234th Lydxn 🇨🇦 890 42 8ms 25 Jan 2023 235th Steffan153 🇫🇮 890 68 4ms 12 Feb 2023 236th JayXon 🇺🇸 890 74 100ms 22 Jan 2025 237th m-tkach 🇺🇦 889 86 62ms 21 Nov 2022 237th sisyphus-ppcg 🇦🇺 889 86 59ms 22 Nov 2022 237th tailorspy 889 86 59ms 23 Sep 2024 240th Steffan153 🇫🇮 888 73 114ms 15 Aug 2024 First Prev 161–240 of 1,679 Next Last