The Tower of Hanoi hole will go live in approximately 41 hours. Why not try and solve it ahead of time?
Card Number Validation in all languages 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 751st Upload-and-View 🇺🇦 450 177 16ms 9 Aug 2025 752nd varhammer 🇷🇺 450 223 12ms 23 Feb 2025 753rd OSYCh314 🇦🇺 447 178 11ms 2 Nov 2024 754th dokutan 445 109 10ms 19 Oct 2024 755th grey0ut 444 105 415ms 11 Jan 2025 756th calum12345 442 180 10ms 26 Mar 2025 757th MyXoToD 🇩🇪 441 146 9ms 26 May 2025 758th Yewzir 🇧🇪 440 171 12ms 26 Dec 2024 759th CheeseCake628 🇳🇴 439 151 453ms 18 Oct 2025 760th zt14427 438 182 11ms 27 Dec 2024 761st IoLimmer 435 183 11ms 10 Oct 2024 762nd KatieLG 🇬🇧 433 183 2ms 2 Oct 2025 763rd aksyristos 433 184 16ms 15 Nov 2024 764th KatieLG 🇬🇧 431 108 7ms 13 Oct 2024 765th snoozingnewt 🇺🇸 430 111 36ms 26 days ago 766th estomagordo 🇳🇱 428 186 10ms 15 Jul 2025 767th snoozingnewt 🇺🇸 426 268 28ms 26 days ago 768th dokutan 425 132 288ms 3 Oct 2024 769th MeWhenI 🇻🇦 424 143 6ms 2 Oct 2024 770th Arkadios200 417 196 95ms 21 Oct 2025 771st aksyristos 409 172 2ms 5 days ago 772nd dieggsy 406 247 21ms 10 Oct 2024 773rd snoozingnewt 🇺🇸 406 313 45ms 26 days ago 774th Mabeloid 🇳🇴 405 159 9ms 12 Oct 2024 775th snoozingnewt 🇺🇸 404 223 102ms 26 days ago 776th Ralac07 🇦🇺 397 162 10ms 3 Oct 2024 777th ehulinsky 🇺🇸 384 158 5ms 2 Apr 2025 778th fischfood 384 176 4ms 22 Oct 2024 779th c0d3-4-F00d 🇩🇪 382 184 2ms 9 Jan 2025 780th snoozingnewt 🇺🇸 379 286 41ms 26 days ago 781st snoozingnewt 🇺🇸 376 267 13ms 26 days ago 782nd KatieLG 🇬🇧 375 218 112ms 7 days ago 783rd RobGLambert 370 232 915ms 8 Jun 2025 784th RedzGoose 🇦🇺 369 187 102ms 2 Oct 2024 785th P1nk-P0nk 369 215 3ms 18 Oct 2024 786th gautambp 365 218 10ms 24 Jun 2025 787th sciencejiho 357 197 2ms 11 Feb 2025 788th The-Wolfson 355 230 98ms 16 Dec 2024 789th Zhenyu-Bo 349 228 14ms 30 Jul 2025 790th EthanJantz 346 230 10ms 5 Sep 2025 791st RobGLambert 342 273 200ms 8 Jun 2025 792nd Ernest1338 339 275 275ms 26 Oct 2024 793rd noahhorlacher 337 191 10ms 7 Dec 2024 794th RobertBurs 336 237 10ms 22 Sep 2025 795th TJK-S 330 241 9ms 25 Oct 2025 796th te-chnical 309 258 193ms 4 May 2025 797th snoozingnewt 🇺🇸 303 200 3ms 26 days ago 798th KatieLG 🇬🇧 296 290 1,806ms 1 Oct 2025 799th KatieLG 🇬🇧 292 241 2ms 1 Oct 2025 800th ReterikHub 277 310 205ms 17 Jan 2025 801st Mikey-Beep 🇬🇧 273 349 25ms 12 Aug 2025 802nd MeWhenI 🇻🇦 271 407 132ms 6 Oct 2024 803rd arebbsba 269 296 12ms 9 Jan 2025 804th Msleizak 🇫🇷 206 226 243ms 19 May 2025 805th AidanWalter 147 540 9ms 1 Jan 2025 806th vkptimon 120 776 307ms 9 Jul 2025 807th bignamehyp 119 667 9ms 14 Nov 2024 808th dokutan 61 2,475 124ms 18 Aug 2025 809th iczelia 🇩🇪 52 2,045 4ms 14 Oct 2025 810th lyphyser 0 15 80ms 25 May 2025 811th 2bular 0 16 76ms 22 Mar 2025 812th darrenks 0 17 78ms 22 Mar 2025 813th Natanaelel 🇸🇪 0 18 74ms 23 Mar 2025 814th plcc0 0 21 99ms 4 Apr 2025 814th namelessiw 0 21 150ms 9 days ago 816th kg583 🇺🇸 0 25 266ms 8 Feb 2025 817th lyxal 🇦🇺 0 27 494ms 17 May 2025 818th themoonisacheese 0 35 484ms 13 Jun 2025 819th ovs-code 🇩🇪 0 54 4ms 9 Jul 2025 820th GrayJoKing 🇦🇺 0 55 3ms 13 Jul 2025 821st ovs-code 🇩🇪 0 58 3ms 13 Jul 2025 822nd AlephSquirrel 0 63 3ms 15 Jun 2025 823rd DialFrost 🇸🇬 0 67 11ms 13 Feb 2025 824th chunes3 🇺🇸 0 69 6ms 13 Feb 2025 825th maweowo 🇩🇪 0 70 4ms 2 Oct 2025 First Prev 751–825 of 832 Next Last