The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Recamán 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 321st NoahBolohan 🇨🇦 625 88 10ms 7 Mar 2023 321st TimLeffke 625 88 9ms 2 Jan 2024 323rd cole-wilson 618 89 10ms 21 Feb 2021 323rd redbeancola 618 89 28ms 11 Oct 2021 323rd karhuthebear 618 89 11ms 6 May 2022 323rd sbyrne51 618 89 10ms 2 Oct 2022 323rd eiburns 618 89 11ms 26 Jan 2023 323rd Vaekor 618 89 10ms 9 Jul 2023 323rd alfonsoalves 618 89 10ms 29 Feb 2024 323rd resoNathan 618 89 17ms 10 May 2024 323rd benvreeves 618 89 10ms 31 Jul 2025 332nd hymanimy 611 90 10ms 11 Aug 2021 332nd BrenSchaap 611 90 17ms 20 Oct 2021 332nd mokymok 🇺🇸 611 90 10ms 29 Nov 2021 332nd midnattssol 🇸🇪 611 90 9ms 19 May 2022 332nd TheCod-r 🇦🇶 611 90 10ms 28 Sep 2022 332nd brochmann 🇸🇪 611 90 30ms 25 Oct 2023 338th boxjelly 604 91 11ms 10 Jan 2021 338th jhpaques 🇫🇷 604 91 10ms 28 Jul 2022 338th Marco-perce 604 91 16ms 22 Aug 2022 338th dgambit 604 91 10ms 26 Sep 2022 342nd forlack 598 92 10ms 10 Nov 2021 342nd lemogne 598 92 10ms 16 Nov 2021 342nd tenthmascot 598 92 10ms 25 Nov 2021 342nd deluca-4139 598 92 10ms 15 Dec 2021 342nd atazzam 🇺🇸 598 92 33ms 1 Apr 2022 342nd zoemarschner 598 92 10ms 16 May 2022 342nd nmgetahun 598 92 10ms 5 Dec 2022 342nd bobbysq 598 92 10ms 13 Feb 2023 350th TheSmilingTurtle 591 93 9ms 14 May 2022 350th SniperSmiley 🇺🇸 591 93 10ms 3 Jul 2022 350th james-downey 591 93 10ms 10 Jul 2022 350th dillon-duncando 591 93 18ms 3 Oct 2022 354th Feriixu 585 94 11ms 9 Feb 2022 354th Starwort 🇬🇧 585 94 16ms 11 Nov 2022 356th austinrwarner 579 95 17ms 28 Dec 2020 356th ArmaanAS 579 95 10ms 4 Apr 2021 356th namcartoon06 579 95 15ms 15 Jul 2023 356th qwjhvbxi 579 95 10ms 9 Feb 2024 360th cbondurant 573 96 10ms 1 Oct 2021 360th PhysicDev 🇫🇷 573 96 16ms 16 Mar 2022 360th 0dyse 573 96 10ms 15 Apr 2025 363rd mothcolada 🇺🇸 567 97 18ms 2 Mar 2021 363rd RustemB 🇷🇺 567 97 18ms 10 Apr 2021 363rd mhenion8293 🇺🇸 567 97 10ms 18 Jan 2022 363rd eshilo-draper 567 97 17ms 8 Oct 2022 363rd StHagel 567 97 16ms 13 Jul 2023 363rd Ythaenagor 567 97 17ms 5 Aug 2024 363rd itljan30 567 97 16ms 30 Jan 2025 363rd croc54 567 97 17ms 30 Jan 2025 371st Alex-x90 🇺🇸 561 98 30ms 27 Dec 2022 372nd Pandapip1 556 99 9ms 10 Feb 2021 372nd Andre3582 556 99 10ms 12 Apr 2021 372nd kevdah 556 99 11ms 5 Oct 2022 372nd Just4FunCoder 556 99 10ms 27 Oct 2022 372nd voidgloom 556 99 20ms 23 Oct 2024 372nd TheAtrossian 556 99 11ms 5 Jan 2025 378th andrewgopher 550 100 10ms 29 Jul 2021 378th bwat2 550 100 10ms 19 Oct 2021 378th a-penton 550 100 10ms 22 Sep 2022 378th jameswmccarty 550 100 17ms 22 Feb 2025 382nd Bananapants22 539 102 11ms 4 Sep 2022 382nd FusionAtom360 539 102 10ms 28 Sep 2024 384th achow0 534 103 11ms 3 Feb 2021 384th Pena86 534 103 10ms 19 Feb 2021 384th twocatsinatrenchcoat 534 103 9ms 11 May 2022 387th hacker19374 529 104 10ms 7 Mar 2023 387th adriweb 🇫🇷 529 104 10ms 22 Aug 2023 387th tobeannouncd 529 104 18ms 19 Sep 2023 390th ramsay 524 105 10ms 14 Aug 2022 390th Azearia 524 105 17ms 23 Oct 2023 392nd henrytranter 519 106 17ms 8 Mar 2021 392nd janga1 519 106 17ms 26 Aug 2021 392nd TralfamadorianComedian 519 106 10ms 31 Dec 2024 392nd Voltrifrodec 🇸🇰 519 106 16ms 6 Nov 2025 396th za3k 514 107 9ms 8 Oct 2022 396th cthierfelder 🇲🇨 514 107 10ms 9 Sep 2025 398th stefanarridge 509 108 10ms 29 Mar 2022 398th Aquateraneal 🇺🇸 509 108 12ms 19 Feb 2026 400th kenny14231 505 109 17ms 17 Aug 2022 First Prev 321–400 of 437 Next Last