The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Tower of Hanoi 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 79th Yewzir 🇧🇪 712 73 12ms 30 Nov 2025 79th SirBogman 🇺🇸 712 73 11ms 1 Dec 2025 79th csharpython 712 73 11ms 6 Jan 2026 79th themoonisacheese 712 73 11ms 23 Jan 2026 85th Babafaba 703 74 13ms 21 Nov 2025 85th JOrE20 703 74 11ms 21 Nov 2025 85th HumanoidCPU 703 74 11ms 29 Nov 2025 85th TheZwierzLF 🇵🇱 703 74 11ms 29 Nov 2025 85th BREMAUCY 🇫🇷 703 74 11ms 30 Nov 2025 85th RandGuy 703 74 11ms 2 Dec 2025 85th annaproxy 703 74 11ms 2 Dec 2025 85th aksyristos 703 74 11ms 3 Dec 2025 85th hippalectryon-0 703 74 12ms 6 Dec 2025 85th SB-945 703 74 12ms 19 Dec 2025 85th te-chnical 703 74 12ms 23 Dec 2025 85th FlorianCassayre 🇫🇷 703 74 18ms 8 Feb 2026 85th xiaoyiming123 703 74 12ms 5 days ago 85th jumpingtj 703 74 12ms 11 hours ago 99th firegene 🇮🇪 693 75 11ms 20 Feb 2026 100th Ripick 684 76 11ms 14 Nov 2025 100th LostSyntax21 🇬🇧 684 76 12ms 30 Nov 2025 100th scpchicken 🇵🇼 684 76 12ms 5 Dec 2025 103rd mousetail 🇳🇱 675 77 12ms 23 Nov 2025 104th Bmrl7 667 78 11ms 20 Dec 2025 105th msbranicky 658 79 11ms 26 Nov 2025 105th nemoyatpeace 658 79 16ms 28 Dec 2025 105th nstearns96 🇬🇧 658 79 11ms 31 Dec 2025 105th tomh1012 658 79 10ms 21 days ago 105th Andrey2001 658 79 11ms 18 hours ago 110th RDShah 627 83 11ms 1 Dec 2025 111th ZakkkkAttackkkk 🇵🇭 619 84 17ms 2 Feb 2026 112th Schmitt-Very-Cool 605 86 11ms 5 Dec 2025 113th kmathis22 571 91 11ms 4 days ago 114th Stockoh 🇫🇷 565 92 11ms 9 Jan 2026 115th CLOStrophobic 🇮🇹 559 93 10ms 3 Dec 2025 116th logalex8369 🇺🇸 542 96 10ms 18 Dec 2025 117th OllieBoyne 🇬🇧 531 98 12ms 11 Dec 2025 118th 4ndyJ 🇬🇧 520 100 12ms 31 Dec 2025 119th AstroOrbis 510 102 10ms 17 Feb 2026 120th DrPrettyman 486 107 19ms 22 Dec 2025 121st robbertvz 456 114 12ms 15 Dec 2025 122nd AidanWalter 291 179 11ms 7 days ago 123rd CheeseCake628 🇳🇴 236 220 12ms 31 Dec 2025 124th averagepythondev 14 3,589 11ms 2 Jan 2026 124th Jacob385 14 3,589 11ms 9 Jan 2026 124th RJFuller 14 3,589 11ms 18 days ago 127th TaserTheFox 🇺🇸 14 3,590 11ms 22 Jan 2026 128th gigaprofisi 🇺🇸 14 3,613 11ms 17 Dec 2025 129th KatieLG-Transpiler 🇬🇧 13 4,099 11ms 9 Jan 2026 First Prev 81–129 of 129
