The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 26 hours. Why not try and solve them ahead of time?
Inventory Sequence in Python 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 160th Andrey135296 740 73 18ms 21 Sep 2024 162nd za3k 730 74 11ms 20 Nov 2022 162nd MaxElf999 730 74 22ms 21 Nov 2022 162nd celiendonze 🇨🇭 730 74 15ms 25 Apr 2023 162nd willschremmer 730 74 21ms 11 May 2024 162nd moustave 730 74 35ms 2 Dec 2024 167th betaveros 720 75 15ms 31 Dec 2022 167th Wildst 720 75 17ms 7 Jul 2023 167th mosho-p 720 75 24ms 14 Sep 2023 167th eiburns 720 75 16ms 26 Oct 2023 171st Edjyzod 711 76 22ms 31 Mar 2023 172nd Squidled 701 77 14ms 3 Jan 2023 172nd mbittner20 701 77 15ms 27 May 2023 172nd xyangst 701 77 15ms 7 Oct 2024 175th Techdude01 684 79 15ms 20 Jan 2023 175th rollershutter 684 79 41ms 4 Jul 2023 175th bob-th 684 79 16ms 19 Aug 2023 175th qwjhvbxi 684 79 15ms 6 Feb 2024 175th StefanHabel 🇨🇦 684 79 18ms 1 Mar 2026 180th Vaekor 675 80 17ms 9 Jul 2023 180th rucin93 🇵🇱 675 80 22ms 10 Feb 2024 180th JunkIce 675 80 15ms 26 Dec 2024 180th fuzzylojik-golf 🇺🇸 675 80 16ms 9 Jun 2025 184th fkantelberg 667 81 11ms 23 Jul 2023 184th CutSandstone 667 81 14ms 4 Jul 2024 186th TaserTheFox 🇺🇸 659 82 17ms 31 Mar 2023 187th glesnick 651 83 51ms 23 Nov 2022 187th Yewzir 🇧🇪 651 83 16ms 7 Feb 2024 187th wh3n3v3r 🇨🇿 651 83 16ms 14 Nov 2024 190th twocatsinatrenchcoat 643 84 16ms 29 Nov 2022 190th FortuiteMan 🇫🇷 643 84 17ms 21 Jul 2025 192nd AZ9tumas 628 86 15ms 17 Dec 2022 192nd jmerle 🇳🇱 628 86 21ms 11 Jul 2023 192nd Mikey-Beep 🇬🇧 628 86 15ms 2 Jun 2024 192nd khaninm 628 86 22ms 4 Jun 2025 196th Just4FunCoder 607 89 39ms 23 Mar 2023 197th SirFireball3521 600 90 16ms 23 Jan 2023 197th yuchuehw 600 90 15ms 10 Feb 2024 199th LeeCamp 593 91 31ms 8 Jan 2023 199th tomh1012 593 91 15ms 26 Feb 2026 201st WillowWispy 587 92 12ms 17 Mar 2025 201st osNiko 🇧🇷 587 92 16ms 18 Aug 2025 203rd inverseLorentz 🇦🇺 581 93 19ms 7 Jan 2024 204th QuincyNash 🇺🇸 574 94 24ms 27 Nov 2022 205th adamreidsmith 563 96 17ms 16 Feb 2024 206th TobyBoyne 🇬🇧 551 98 14ms 28 Nov 2022 206th TheLazySquid 551 98 15ms 23 Jan 2023 208th Andrey2001 545 99 230ms 28 Jan 2026 209th brimstonetrader 535 101 15ms 8 Jan 2024 209th Matter1024 🇮🇳 535 101 17ms 2 days ago 211th jameswmccarty 529 102 18ms 23 Feb 2025 212th amollberg 🇸🇪 524 103 22ms 23 Apr 2023 212th HumanoidCPU 524 103 39ms 26 Jun 2024 212th ComputerKWasTaken 🇺🇸 524 103 15ms 23 Jan 2025 215th ridingqwerty 🇺🇸 519 104 15ms 1 Feb 2024 215th Pyroan 519 104 24ms 16 Apr 2025 217th NoahBolohan 🇨🇦 514 105 16ms 2 Feb 2023 218th TheCod-r 🇦🇶 509 106 16ms 24 Feb 2023 218th adoxography 509 106 14ms 19 Nov 2023 220th eshilo-draper 495 109 16ms 12 Jun 2023 220th Ythaenagor 495 109 16ms 5 Aug 2024 222nd aeonsablaze 482 112 21ms 22 Nov 2022 222nd cingulataluke 482 112 14ms 28 Aug 2023 224th Ripick 470 115 14ms 8 Feb 2023 225th J09M 462 117 1,092ms 15 Dec 2025 226th DrPrettyman 458 118 17ms 6 Jul 2023 226th gigaprofisi 🇺🇸 458 118 1,092ms 1 Nov 2025 228th keelimeguy 🇺🇸 443 122 14ms 14 Jun 2025 229th robin-scragg 415 130 13ms 25 Oct 2025 230th kevinnaviapaiva 388 139 12ms 7 Mar 2025 231st shibacho 🇯🇵 386 140 10ms 13 Dec 2022 232nd RaBa21 🇭🇺 375 144 19ms 19 Jul 2025 233rd Yongmin870 372 145 1,050ms 16 Dec 2023 234th clayboll99 367 147 13ms 11 Jul 2025 235th dylanjones92 316 171 16ms 18 Jan 2024 236th atazzam 🇺🇸 314 172 21ms 4 Feb 2023 237th henry-von-wichert 273 198 19ms 30 Mar 2023 238th alfonsoalves 257 210 13ms 27 Feb 2024 239th Zhenyu-Bo 213 253 15ms 31 Jul 2025 240th muser-logiccpu 🇺🇦 181 298 15ms 25 Aug 2025 First Prev 161–240 of 247 Next Last