The Tower of Hanoi hole will go live in approximately 23 hours. Why not try and solve it ahead of time?
ISBN 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions 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 Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Tower of Hanoi Turtle Tutorial All Languages ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions 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 Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Tower of Hanoi Turtle Tutorial # Golfer Points Bytes Time Submitted 76th prplz 🇦🇺 843 108 10ms 11 Jan 2022 76th galloj 🇨🇿 843 108 9ms 21 Sep 2022 76th TaserTheFox 🇺🇸 843 108 10ms 3 Apr 2023 76th jatloe 843 108 10ms 26 Aug 2024 76th cros107 🇦🇺 843 108 9ms 10 Aug 2025 81st ZakkkkAttackkkk 🇵🇭 835 109 11ms 23 Feb 2022 81st cefqrn 835 109 9ms 24 Dec 2022 81st AlexanderFair 835 109 10ms 11 Jul 2023 81st firegene 🇮🇪 835 109 9ms 18 Jan 2024 81st PixelSoftwareStudios 🇺🇸 835 109 10ms 6 Jul 2024 81st andrewjc2000 835 109 10ms 9 Mar 2025 87th btjones0 827 110 9ms 25 Jan 2022 87th adamnielson42 🇺🇸 827 110 9ms 25 Apr 2023 87th sultan 827 110 10ms 24 Feb 2024 87th fgrosshans 🇫🇷 827 110 10ms 16 Jul 2024 87th edsrzf 🇳🇿 827 110 11ms 30 Jul 2025 87th InigoK 🇺🇸 827 110 12ms 22 Sep 2025 87th albanian-laundromat 827 110 10ms 22 days ago 87th vhoulbreque 🇫🇷 827 110 10ms 4 days ago 95th neihousaigaai 820 111 9ms 11 Jan 2022 95th knutae 🇳🇴 820 111 10ms 18 Jan 2022 95th rschwa6308 🇺🇸 820 111 9ms 22 Mar 2023 95th zbreit 🇺🇸 820 111 11ms 22 Mar 2023 95th plcc0 820 111 9ms 3 Mar 2025 95th emgordon154 820 111 10ms 25 Mar 2025 95th BREMAUCY 🇫🇷 820 111 9ms 15 Apr 2025 95th now4est 🇯🇵 820 111 10ms 25 Sep 2025 103rd guilhem-roy 🇫🇷 813 112 9ms 5 Jun 2022 103rd ahmetdemirag 🇨🇾 813 112 11ms 30 Jun 2024 103rd CommandLeo 🇮🇹 813 112 9ms 26 days ago 106th commandblockguy 🇺🇸 805 113 10ms 3 Nov 2022 106th jakobkordez 🇸🇮 805 113 9ms 13 Nov 2022 106th mossprescott 805 113 10ms 16 Jan 2023 106th SB-945 805 113 10ms 19 Aug 2023 106th davitf 805 113 10ms 30 Apr 2024 106th kbeat 🇰🇿 805 113 11ms 18 May 2025 112th aonkeeper4 798 114 9ms 5 Jul 2022 112th jared-hughes 798 114 9ms 7 Jul 2022 112th frankgraziano 798 114 10ms 8 Jan 2023 112th m42km 798 114 9ms 22 Nov 2023 112th thienudomsrirungruang 798 114 16ms 14 May 2024 112th jtaxen 798 114 9ms 8 Jun 2024 112th CutSandstone 798 114 9ms 8 Jul 2024 119th jmerle 🇳🇱 791 115 10ms 22 Jan 2022 119th PiterAnnema 791 115 15ms 23 Mar 2022 119th AGoyet 791 115 9ms 29 Jun 2022 119th Eilonlif 🇮🇱 791 115 10ms 11 Sep 2022 119th IsmaelGSerrano 791 115 10ms 2 Nov 2022 119th bobbysq 791 115 9ms 22 Jan 2023 119th msbranicky 791 115 9ms 25 Jul 2023 119th ArenaGrenade 791 115 9ms 19 Feb 2024 119th NickTheEASDude 🇺🇸 791 115 9ms 15 May 2024 119th dokutan 791 115 10ms 13 Aug 2024 119th maxgodfrey2004 🇨🇦 791 115 9ms 8 Jan 2025 119th Pyroan 791 115 10ms 21 Feb 2025 119th chartung17 791 115 10ms 24 Mar 2025 132nd martinnorling 🇸🇪 784 116 9ms 18 Feb 2022 132nd Indivicivet 784 116 10ms 9 May 2022 132nd Bonjour27891 🇻🇳 784 116 10ms 15 Jul 2022 132nd tri1212 🇻🇳 784 116 9ms 16 Jul 2022 132nd MichalMarsalek 🇨🇿 784 116 10ms 30 Nov 2022 132nd yzhs 🇩🇪 784 116 10ms 25 Jun 2023 132nd Attero 🇸🇪 784 116 10ms 2 Jan 2024 132nd RobertHoeh 784 116 10ms 9 Apr 2024 132nd Mabeloid 🇳🇴 784 116 10ms 7 Oct 2024 132nd rollershutter 784 116 9ms 24 Feb 2025 142nd CedricGebistorf 778 117 9ms 19 Feb 2022 142nd sjrct 778 117 10ms 5 Aug 2024 142nd FranklinJiaChen 778 117 10ms 10 Aug 2024 142nd Artemis21 🇬🇧 778 117 10ms 21 Dec 2024 146th Tess2662 771 118 11ms 8 Sep 2022 146th CheeseCake628 🇳🇴 771 118 9ms 20 Mar 2023 146th randolchance 771 118 11ms 20 Mar 2023 146th jeff-at-tamer-dot-codes 🇺🇸 771 118 10ms 19 May 2023 146th gabe-gallegos 771 118 10ms 19 May 2024 First Prev 76–150 of 363 Next Last