The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Look and Say 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 abba23 588 102 10ms 13 Jun 2021 160th olavaga 588 102 10ms 15 Aug 2021 160th Anonymousellama21 588 102 15ms 15 Jun 2022 160th Mikey-Beep 🇬🇧 588 102 11ms 17 Jun 2022 160th grave367 588 102 11ms 5 Mar 2023 160th msbranicky 588 102 10ms 10 Aug 2023 160th m42km 588 102 15ms 25 Nov 2023 160th eddvrs 588 102 11ms 22 Dec 2023 160th sultan 588 102 11ms 5 Mar 2024 160th Languag3 588 102 10ms 9 Oct 2024 160th KasperKivimaeki 🇫🇮 588 102 10ms 10 Jul 2025 160th LostSyntax21 🇬🇧 588 102 15ms 6 Jan 2026 173rd NewDefectus 🇮🇱 583 103 13ms 18 Dec 2020 173rd Indivicivet 583 103 11ms 16 Mar 2021 173rd rowechenzhong 583 103 11ms 27 Nov 2021 173rd CedricGebistorf 583 103 10ms 6 Mar 2022 173rd trist224 🇫🇷 583 103 11ms 1 Sep 2022 173rd betaveros 583 103 10ms 31 Dec 2022 173rd klixel 🇨🇦 583 103 11ms 28 Mar 2025 173rd Matter1024 🇮🇳 583 103 10ms 2 Jul 2025 173rd redweasel 583 103 10ms 24 Jul 2025 182nd ArmaanAS 577 104 15ms 26 Mar 2021 182nd neihousaigaai 577 104 11ms 28 Mar 2021 182nd Eilonlif 🇮🇱 577 104 11ms 11 Sep 2022 182nd fbe 577 104 11ms 18 Oct 2023 182nd jatloe 577 104 12ms 9 Sep 2024 187th bastienvoirin 🇫🇷 571 105 15ms 5 Dec 2020 187th ejini6969 571 105 12ms 1 Apr 2023 187th stertooy 🇧🇪 571 105 10ms 14 Jun 2024 187th bnic24 571 105 10ms 31 Jul 2024 187th InigoK 🇺🇸 571 105 12ms 21 Aug 2025 192nd potato-jackson 566 106 15ms 5 Mar 2021 192nd nstearns96 🇬🇧 566 106 15ms 23 Jan 2023 192nd roupiq 🇵🇱 566 106 10ms 19 Feb 2024 192nd Bmrl7 566 106 12ms 24 Dec 2025 196th andre-lameirinhas 🇵🇹 561 107 36ms 14 Dec 2020 196th knutae 🇳🇴 561 107 10ms 15 Jul 2021 196th itsjustfreekie 561 107 10ms 21 Sep 2021 196th eshilo-draper 561 107 10ms 7 Nov 2022 196th mbittner20 561 107 10ms 27 May 2023 196th tobeannouncd 561 107 10ms 15 Sep 2023 196th BREMAUCY 🇫🇷 561 107 16ms 24 Apr 2024 196th Ythaenagor 561 107 10ms 5 Aug 2024 196th Emutis 🇱🇹 561 107 10ms 6 Aug 2025 196th wobblybits 561 107 15ms 16 Aug 2025 196th zgialor-lab 561 107 10ms 17 Dec 2025 207th abailey2020 🇺🇸 556 108 9ms 12 Dec 2020 207th ComputerKWasTaken 🇺🇸 556 108 10ms 15 Oct 2024 209th argusdusty 🇺🇸 550 109 10ms 31 Dec 2020 209th fynnkroeger 550 109 35ms 8 Feb 2021 209th Starwort 🇬🇧 550 109 10ms 5 Mar 2021 209th b10011 🇫🇮 550 109 15ms 8 Jan 2023 209th GulgDev 550 109 14ms 21 Mar 2023 209th zwxzwxzwx21 550 109 10ms 30 Jan 2024 209th swtchblade 550 109 9ms 23 Jul 2025 216th boxjelly 545 110 15ms 12 Feb 2021 216th cesarm4 545 110 11ms 31 Aug 2021 216th Kloppermand 🇩🇰 545 110 16ms 28 Sep 2021 216th LeeCamp 545 110 12ms 15 Feb 2022 216th za3k 545 110 10ms 12 Oct 2022 216th lzahray 545 110 11ms 25 Oct 2022 222nd johnnythedoggie 541 111 10ms 29 Apr 2021 222nd blamegames 541 111 10ms 16 May 2021 222nd fgrosshans 🇫🇷 541 111 11ms 7 May 2023 222nd wk1093 541 111 10ms 18 Nov 2023 222nd SoliGhost 541 111 10ms 10 Jun 2025 222nd Deedogg 541 111 11ms 30 Oct 2025 228th vezzick 536 112 11ms 4 Mar 2021 228th guilhem-roy 🇫🇷 536 112 11ms 28 Feb 2022 228th celiendonze 🇨🇭 536 112 10ms 18 Jul 2023 228th CutSandstone 536 112 11ms 4 Jul 2024 228th codingisgreatbutiamnot 536 112 10ms 7 Aug 2024 228th muser-logiccpu 🇺🇦 536 112 10ms 21 Aug 2025 234th jiaminglimjm 🇲🇾 531 113 11ms 6 Jan 2021 234th mothcolada 🇺🇸 531 113 10ms 21 Apr 2021 234th NicoAdams 531 113 10ms 5 Jan 2022 234th martinnorling 🇸🇪 531 113 13ms 21 Feb 2022 234th jfallon1997 531 113 10ms 8 Aug 2022 234th RandGuy 531 113 10ms 22 Nov 2022 234th jacksonhenry3 531 113 10ms 2 Dec 2022 First Prev 161–240 of 414 Next Last
