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 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 nwellnhof 🇩🇪 901 88 466ms 25 Sep 2025 161st namelessiw 901 88 374ms 2 Oct 2025 161st Steffan153 🇫🇮 901 88 380ms 11 Feb 2026 164th JayXon 🇺🇸 900 55 612ms 4 Apr 2023 164th Lydxn 🇨🇦 900 55 601ms 27 Jun 2023 166th annaproxy 900 58 33ms 20 Nov 2022 166th janbehrens 🇩🇪 900 58 30ms 21 Nov 2022 166th sisyphus-ppcg 🇦🇺 900 58 11ms 22 Nov 2022 166th hallvabo 🇳🇴 900 58 10ms 22 Nov 2022 166th AlephSquirrel 900 58 31ms 9 Jan 2023 166th scpchicken 🇵🇼 900 58 30ms 10 Mar 2023 166th anter69 🇭🇺 900 58 11ms 12 Jun 2024 166th MeWhenI 🇻🇦 900 58 11ms 22 Jul 2024 166th DialFrost 🇸🇬 900 58 10ms 2 Aug 2024 166th 5cw 🇺🇸 900 58 29ms 6 Nov 2024 166th emgordon154 900 58 12ms 17 May 2025 166th Mukundan314 900 58 37ms 21 Jun 2025 166th Natanaelel 🇸🇪 900 58 11ms 15 Jul 2025 166th blaztoma 🇱🇹 900 58 11ms 17 Aug 2025 166th Emutis 🇱🇹 900 58 12ms 21 Aug 2025 166th InigoK 🇺🇸 900 58 11ms 4 Sep 2025 166th luuumine 🇫🇷 900 58 11ms 7 Nov 2025 166th BrunoVisnadi 🇧🇷 900 58 36ms 15 Dec 2025 166th CornerMercury 🇬🇧 900 58 30ms 16 Dec 2025 185th GrayJoKing 🇦🇺 900 69 41ms 21 Nov 2022 185th Lydxn 🇨🇦 900 69 41ms 24 Jun 2023 185th Lydxn 🇨🇦 900 69 39ms 27 Jun 2023 185th zacjl 900 69 39ms 15 Dec 2024 189th JayXon 🇺🇸 900 72 118ms 6 Dec 2022 190th nwellnhof 🇩🇪 900 85 53ms 25 Nov 2022 190th 09cf 900 85 57ms 18 Oct 2023 190th inventshah 900 85 63ms 3 Feb 2024 190th Steffan153 🇫🇮 900 85 55ms 14 Aug 2024 190th sean-niemann 🇺🇸 900 85 70ms 9 May 2025 195th 2bular 899 27 33ms 3 Sep 2025 196th primo-ppcg 🇹🇭 898 55 14ms 25 Nov 2022 196th ovs-code 🇩🇪 898 55 10ms 25 Nov 2022 196th Steffan153 🇫🇮 898 55 11ms 24 Jan 2023 196th MeWhenI 🇻🇦 898 55 12ms 1 Jul 2023 196th DialFrost 🇸🇬 898 55 10ms 30 Jul 2024 196th sean-niemann 🇺🇸 898 55 12ms 30 Jul 2024 196th rucin93 🇵🇱 898 55 12ms 30 Jul 2024 196th duckyluuk 🇳🇱 898 55 11ms 18 Oct 2024 196th xsot 🇸🇬 898 55 13ms 24 May 2025 196th GrayJoKing 🇦🇺 898 55 10ms 11 Jul 2025 196th pardouin 🇫🇷 898 55 10ms 26 Jul 2025 207th Lydxn 🇨🇦 898 81 462ms 25 Jun 2023 208th JayXon 🇺🇸 896 74 3,039ms 13 Nov 2024 209th IanUtley 896 77 18ms 12 Dec 2022 210th JayXon 🇺🇸 896 106 288ms 22 Nov 2022 210th nwellnhof 🇩🇪 896 106 289ms 22 Nov 2022 210th stefangimmillaro 896 106 290ms 17 Jun 2023 210th Lydxn 🇨🇦 896 106 288ms 24 Jun 2023 210th Steffan153 🇫🇮 896 106 298ms 14 Aug 2024 210th sean-niemann 🇺🇸 896 106 275ms 17 Apr 2025 210th edsrzf 🇳🇿 896 106 294ms 27 Aug 2025 217th Steffan153 🇫🇮 895 84 399ms 14 Aug 2024 217th sean-niemann 🇺🇸 895 84 417ms 20 Jun 2025 217th namelessiw 895 84 440ms 14 Aug 2025 220th GrayJoKing 🇦🇺 892 35 125ms 20 Feb 2023 220th nwellnhof 🇩🇪 892 35 259ms 25 Jun 2023 222nd sisyphus-ppcg 🇦🇺 892 45 1ms 22 Nov 2022 222nd Steffan153 🇫🇮 892 45 1ms 14 Aug 2024 222nd sean-niemann 🇺🇸 892 45 1ms 9 May 2025 225th SirBogman 🇺🇸 892 46 272ms 21 Nov 2022 225th primo-ppcg 🇹🇭 892 46 252ms 22 Nov 2022 225th Lydxn 🇨🇦 892 46 289ms 24 Jun 2023 225th bitsandbeyond 🇳🇱 892 46 250ms 31 Dec 2025 229th Lydxn 🇨🇦 892 74 41ms 27 Jun 2023 229th stefangimmillaro 892 74 38ms 31 Oct 2024 231st GolfingSuccess 🇬🇷 891 62 9ms 16 Oct 2023 232nd ovs-code 🇩🇪 891 66 2ms 20 Nov 2022 232nd sisyphus-ppcg 🇦🇺 891 66 2ms 22 Nov 2022 232nd m-tkach 🇺🇦 891 66 2ms 22 Nov 2022 232nd BlankSpruce 891 66 2ms 16 Apr 2025 236th stefangimmillaro 891 89 512ms 6 Oct 2025 236th DialFrost 🇸🇬 891 89 352ms 20 Nov 2025 238th Lydxn 🇨🇦 890 42 8ms 25 Jan 2023 239th Steffan153 🇫🇮 890 68 4ms 12 Feb 2023 240th JayXon 🇺🇸 890 74 100ms 22 Jan 2025 First Prev 161–240 of 1,682 Next Last