The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Lucky Numbers 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 b10011 🇫🇮 584 89 38ms 8 Jan 2023 160th AbhilashaTandon 584 89 12ms 24 Sep 2023 160th eddvrs 584 89 12ms 20 Dec 2023 164th jfallon1997 578 90 32ms 7 Sep 2022 164th xDragoxboi 578 90 12ms 30 Jun 2025 164th jacekwladzinski 578 90 11ms 5 Oct 2025 167th commandz0 🇺🇸 571 91 102ms 21 Sep 2022 167th MaxElf999 571 91 3,503ms 28 Sep 2022 167th fkantelberg 571 91 53ms 7 Aug 2023 167th sultan 571 91 30ms 5 Mar 2024 171st Ailko 🇧🇪 565 92 11ms 6 May 2022 171st ComputerKWasTaken 🇺🇸 565 92 11ms 23 Oct 2024 173rd TobyBoyne 🇬🇧 559 93 3,365ms 3 Mar 2022 173rd P-Quentin 🇫🇷 559 93 26ms 10 Aug 2022 173rd jtaxen 559 93 101ms 26 Mar 2024 173rd jameswmccarty 559 93 10ms 10 Jul 2024 173rd codingisgreatbutiamnot 559 93 721ms 6 Aug 2025 178th adamnielson42 🇺🇸 553 94 60ms 21 Aug 2023 178th brochmann 🇸🇪 553 94 12ms 28 Oct 2023 178th 40fied4t 553 94 37ms 1 Jun 2025 181st m42km 547 95 49ms 16 Dec 2023 181st Natanaelel 🇸🇪 547 95 29ms 15 Jul 2025 183rd j-Ewan 542 96 104ms 4 Mar 2022 183rd nullie 542 96 82ms 9 Jun 2022 183rd andrewjc2000 542 96 29ms 28 Jul 2025 183rd Bmrl7 542 96 130ms 24 Dec 2025 187th IsaacAlexBarden 536 97 28ms 13 Feb 2025 188th sleepyStick 531 98 10ms 11 Mar 2022 188th damoose717 531 98 11ms 24 May 2025 190th Andrey135296 525 99 198ms 29 Nov 2024 191st Fishron 520 100 91ms 18 Jun 2022 191st vishwathg 520 100 112ms 5 Oct 2023 191st 4ndyJ 🇬🇧 520 100 220ms 23 Dec 2023 191st chartung17 520 100 114ms 1 Jan 2024 195th celiendonze 🇨🇭 515 101 108ms 18 Jul 2023 195th namelessiw 515 101 115ms 13 Jul 2024 195th moustave 515 101 225ms 3 Dec 2024 195th Andre3582 515 101 12ms 8 Oct 2025 199th inverseLorentz 🇦🇺 510 102 12ms 5 May 2023 199th WillowWispy 510 102 31ms 17 Mar 2025 199th mousetail 🇳🇱 510 102 293ms 26 Sep 2025 199th madeforlosers 510 102 12ms 11 Nov 2025 203rd Bonjour27891 🇻🇳 505 103 43ms 4 Mar 2022 203rd AlexanderFair 505 103 857ms 25 Jul 2023 205th eiburns 500 104 36ms 25 Aug 2023 206th twocatsinatrenchcoat 495 105 39ms 29 Mar 2022 206th xyangst 495 105 39ms 18 Oct 2024 206th vhoulbreque 🇫🇷 495 105 11ms 11 Feb 2025 209th Marthe-CC 491 106 813ms 16 Oct 2022 209th CatsAreFluffy 491 106 97ms 10 Jan 2023 209th tobyLovick 491 106 29ms 13 Feb 2025 212th adoxography 486 107 28ms 1 Sep 2025 213th Pena86 481 108 13ms 16 Sep 2022 213th PyryL 🇫🇮 481 108 13ms 25 Aug 2024 215th CedricGebistorf 477 109 115ms 10 Mar 2022 215th galloj 🇨🇿 477 109 312ms 28 Aug 2022 215th TheZwierzLF 🇵🇱 477 109 3,302ms 21 May 2025 218th trist224 🇫🇷 473 110 947ms 1 Sep 2022 219th SniperSmiley 🇺🇸 468 111 192ms 16 Jun 2022 220th amollberg 🇸🇪 464 112 107ms 25 Mar 2022 221st badboj40 460 113 91ms 27 Dec 2022 222nd crazymoose7 456 114 95ms 5 Jun 2024 223rd mathisfun271 452 115 61ms 24 Dec 2023 223rd qwjhvbxi 452 115 94ms 8 Feb 2024 225th estomagordo 🇳🇱 441 118 52ms 26 Oct 2022 225th andre-lameirinhas 🇵🇹 441 118 27ms 26 Apr 2023 225th davidludwik2370 441 118 13ms 29 Jul 2025 228th Unknownuserfrommars 437 119 432ms 21 Nov 2024 228th clayboll99 437 119 13ms 15 Jul 2025 228th Zhenyu-Bo 437 119 1,564ms 31 Jul 2025 231st Techdude01 433 120 15ms 21 Dec 2023 231st aalec 433 120 106ms 24 Apr 2024 233rd NickTheEASDude 🇺🇸 426 122 12ms 9 Apr 2024 234th dillon-duncando 423 123 59ms 3 Oct 2022 235th Bananapants22 419 124 3,418ms 17 Aug 2022 235th Florian-Mt 419 124 28ms 29 Sep 2023 237th Mr-McChicken 416 125 119ms 17 Oct 2023 238th dtbao20 🇻🇳 409 127 12ms 1 Oct 2024 239th brimstonetrader 397 131 40ms 21 Jan 2024 240th tomh1012 385 135 39ms 27 days ago First Prev 161–240 of 253 Next Last