The Tower of Hanoi hole will go live in approximately 11 hours. Why not try and solve it ahead of time?
ISBN in all languages 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 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 Chars Time Submitted 676th iczelia 🇩🇪 728 97 9ms 26 Sep 2025 677th chunes3 🇺🇸 727 100 70ms 15 Sep 2023 677th Natanaelel 🇸🇪 727 100 67ms 8 Dec 2023 679th Yewzir 🇧🇪 727 137 39ms 28 Nov 2023 680th GeneralTwi 726 95 10ms 2 May 2022 681st retrohun 726 151 57ms 30 Dec 2022 681st annaproxy 726 151 57ms 5 Jan 2023 683rd ericlangedijk 🇸🇮 725 106 357ms 19 Mar 2022 684th KenanSi 724 42 2ms 24 Feb 2022 684th Natanaelel 🇸🇪 724 42 3ms 21 Jun 2022 684th GolfingSuccess 🇬🇷 724 42 2ms 31 Dec 2022 687th Shanethegamer 🇺🇸 724 161 38ms 13 Feb 2025 688th mlugg 724 203 1,717ms 10 Aug 2024 689th Natanaelel 🇸🇪 723 62 34ms 18 May 2025 690th AlephSquirrel 722 36 38ms 29 Dec 2022 691st Shanethegamer 🇺🇸 722 138 46ms 6 Sep 2022 692nd GolfingSuccess 🇬🇷 721 80 7ms 17 Aug 2024 693rd krcs 🇵🇱 721 98 9ms 2 May 2022 693rd stefangimmillaro 721 98 9ms 12 Sep 2024 695th janbehrens 🇩🇪 721 130 2ms 23 Jun 2023 695th dokutan 721 130 2ms 21 days ago 697th jared-hughes 721 152 371ms 24 Jun 2022 697th Betuaredead 721 152 372ms 7 Jan 2023 699th Shanethegamer 🇺🇸 719 180 45ms 23 Apr 2022 700th CheeseCake628 🇳🇴 718 87 399ms 17 Jan 2024 701st Jacob385 718 96 10ms 17 Sep 2024 702nd janbehrens 🇩🇪 718 133 508ms 24 Nov 2022 703rd MeWhenI 🇻🇦 717 139 43ms 17 Feb 2023 704th scpchicken 🇵🇼 716 58 3ms 22 Feb 2023 705th MeWhenI 🇻🇦 716 72 2ms 13 Nov 2022 706th dokutan 716 153 56ms 21 days ago 707th msbranicky 716 168 159ms 1 Oct 2023 708th ScottHamper 715 149 308ms 26 Feb 2022 709th Frowny 715 156 180ms 11 Jan 2022 710th GeorgeStechman 🇬🇧 714 99 9ms 19 May 2022 710th vphoebe 714 99 8ms 25 May 2022 710th elisherer 🇮🇱 714 99 9ms 5 Jun 2022 713th revlayle 🇺🇸 712 108 364ms 20 Jan 2022 713th primo-ppcg 🇹🇭 712 108 335ms 20 Apr 2022 715th ovs-code 🇩🇪 711 63 33ms 9 May 2023 715th nwellnhof 🇩🇪 711 63 37ms 18 Jul 2023 715th tatzyr 🇯🇵 711 63 32ms 28 Dec 2024 718th nwellnhof 🇩🇪 711 97 9ms 18 Jul 2023 718th 4atj 711 97 16ms 30 Jun 2025 720th HallMatthew314 711 157 135ms 24 Jan 2022 721st pandapawskat 710 132 2ms 7 Feb 2022 722nd AlephSquirrel 709 136 4ms 14 May 2025 723rd DialFrost 🇸🇬 708 43 2ms 3 Feb 2024 724th Shanethegamer 🇺🇸 708 120 14ms 14 Dec 2023 725th albanian-laundromat 708 265 523ms 18 Oct 2025 726th Blendi-Goose 707 122 2ms 19 Jun 2025 727th nullshallot 706 78 254ms 5 Jan 2025 728th HumanoidCPU 705 107 2,971ms 3 Mar 2025 729th duckyluuk 🇳🇱 705 108 11ms 13 Dec 2024 730th jgbaldwinbrown 705 133 2ms 13 Oct 2022 730th klixel 🇨🇦 705 133 2ms 27 Nov 2023 732nd GrayJoKing 🇦🇺 704 59 3ms 14 Jan 2022 732nd Shanethegamer 🇺🇸 704 59 3ms 20 Jun 2022 734th bizy-coder 704 98 9ms 25 Jul 2024 735th emgordon154 703 37 40ms 11 Sep 2024 736th Yewzir 🇧🇪 703 87 714ms 14 days ago 737th ovs-code 🇩🇪 702 89 373ms 5 Jul 2024 737th Steffan153 🇫🇮 702 89 394ms 7 Aug 2024 739th MeWhenI 🇻🇦 702 123 2ms 2 Oct 2024 740th GrayJoKing 🇦🇺 700 64 42ms 10 Feb 2022 740th olivermrose 🇺🇸 700 64 37ms 5 Dec 2022 742nd fitzdotlol 🇺🇸 699 101 9ms 7 Mar 2022 742nd mrxz 🇳🇱 699 101 10ms 23 Jun 2024 744th Shanethegamer 🇺🇸 699 104 71ms 4 Dec 2024 745th DialFrost 🇸🇬 697 94 4ms 29 Oct 2023 746th AlephSquirrel 697 99 9ms 21 Jul 2023 746th Seek64 🇩🇪 697 99 10ms 24 Sep 2024 746th jared-hughes 697 99 10ms 5 hours ago 749th snoozingnewt 🇺🇸 697 148 117ms 10 days ago 750th inverseLorentz 🇦🇺 697 160 166ms 14 May 2024 First Prev 676–750 of 1,543 Next Last