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 Python 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 160th YAJUE114514 718 71 15ms 13 Jul 2025 160th madeforlosers 718 71 15ms 13 Nov 2025 163rd msbranicky 708 72 15ms 19 Aug 2023 163rd adamnielson42 🇺🇸 708 72 15ms 21 Aug 2023 163rd Masttest 708 72 16ms 15 Feb 2024 163rd Code-Coder-coder 708 72 14ms 24 Nov 2025 167th jhpaques 🇫🇷 699 73 40ms 30 Nov 2022 167th Andrey135296 699 73 18ms 21 Sep 2024 169th za3k 689 74 11ms 20 Nov 2022 169th MaxElf999 689 74 22ms 21 Nov 2022 169th celiendonze 🇨🇭 689 74 15ms 25 Apr 2023 169th moustave 689 74 35ms 2 Dec 2024 173rd betaveros 680 75 15ms 31 Dec 2022 173rd Wildst 680 75 17ms 7 Jul 2023 173rd mosho-p 680 75 24ms 14 Sep 2023 173rd eiburns 680 75 16ms 26 Oct 2023 177th Edjyzod 671 76 22ms 31 Mar 2023 178th Squidled 662 77 14ms 3 Jan 2023 178th mbittner20 662 77 15ms 27 May 2023 178th HumanoidCPU 662 77 40ms 26 Jun 2024 178th xyangst 662 77 15ms 7 Oct 2024 182nd Techdude01 646 79 15ms 20 Jan 2023 182nd rollershutter 646 79 41ms 4 Jul 2023 182nd bob-th 646 79 16ms 19 Aug 2023 182nd qwjhvbxi 646 79 15ms 6 Feb 2024 182nd StefanHabel 🇨🇦 646 79 18ms 26 days ago 187th Vaekor 638 80 17ms 9 Jul 2023 187th fuzzylojik-golf 🇺🇸 638 80 16ms 9 Jun 2025 189th fkantelberg 630 81 11ms 23 Jul 2023 189th cingulataluke 630 81 15ms 28 Aug 2023 189th CutSandstone 630 81 14ms 4 Jul 2024 192nd TaserTheFox 🇺🇸 622 82 17ms 31 Mar 2023 193rd glesnick 614 83 51ms 23 Nov 2022 194th twocatsinatrenchcoat 607 84 16ms 29 Nov 2022 194th FortuiteMan 🇫🇷 607 84 17ms 21 Jul 2025 196th AZ9tumas 593 86 15ms 17 Dec 2022 196th Mikey-Beep 🇬🇧 593 86 15ms 2 Jun 2024 196th khaninm 593 86 22ms 4 Jun 2025 196th keelimeguy 🇺🇸 593 86 12ms 14 Jun 2025 200th SirFireball3521 567 90 16ms 23 Jan 2023 200th yuchuehw 567 90 15ms 10 Feb 2024 200th robin-scragg 567 90 13ms 25 Oct 2025 203rd LeeCamp 560 91 31ms 8 Jan 2023 203rd tomh1012 560 91 15ms 26 Feb 2026 205th WillowWispy 554 92 12ms 17 Mar 2025 205th osNiko 🇧🇷 554 92 16ms 18 Aug 2025 207th inverseLorentz 🇦🇺 548 93 19ms 7 Jan 2024 208th QuincyNash 🇺🇸 543 94 24ms 27 Nov 2022 209th adamreidsmith 531 96 17ms 16 Feb 2024 210th RaBa21 🇭🇺 526 97 18ms 19 Jul 2025 211th TobyBoyne 🇬🇧 520 98 14ms 28 Nov 2022 211th TheLazySquid 520 98 15ms 23 Jan 2023 213th Andrey2001 515 99 230ms 28 Jan 2026 214th brimstonetrader 505 101 15ms 8 Jan 2024 215th jameswmccarty 500 102 18ms 23 Feb 2025 216th amollberg 🇸🇪 495 103 22ms 23 Apr 2023 216th ComputerKWasTaken 🇺🇸 495 103 15ms 23 Jan 2025 218th ridingqwerty 🇺🇸 490 104 15ms 1 Feb 2024 218th Pyroan 490 104 24ms 16 Apr 2025 220th NoahBolohan 🇨🇦 486 105 16ms 2 Feb 2023 221st TheCod-r 🇦🇶 481 106 16ms 24 Feb 2023 221st adoxography 481 106 14ms 19 Nov 2023 223rd eshilo-draper 468 109 16ms 12 Jun 2023 223rd Ythaenagor 468 109 16ms 5 Aug 2024 225th aeonsablaze 455 112 21ms 22 Nov 2022 226th Ripick 443 115 14ms 8 Feb 2023 227th J09M 436 117 1,092ms 15 Dec 2025 228th DrPrettyman 432 118 17ms 6 Jul 2023 228th gigaprofisi 🇺🇸 432 118 1,092ms 1 Nov 2025 230th kevinnaviapaiva 367 139 12ms 7 Mar 2025 231st shibacho 🇯🇵 364 140 10ms 13 Dec 2022 232nd Yongmin870 352 145 1,050ms 16 Dec 2023 233rd clayboll99 347 147 13ms 11 Jul 2025 234th dylanjones92 298 171 16ms 18 Jan 2024 235th atazzam 🇺🇸 297 172 21ms 4 Feb 2023 236th henry-von-wichert 258 198 19ms 30 Mar 2023 237th alfonsoalves 243 210 13ms 27 Feb 2024 238th Zhenyu-Bo 202 253 15ms 31 Jul 2025 239th muser-logiccpu 🇺🇦 171 298 15ms 25 Aug 2025 240th AidanWalter 80 636 15ms 3 Jan 2025 First Prev 161–240 of 246 Next Last