The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Tower of Hanoi 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 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 721st MeWhenI 🇻🇦 725 141 1,436ms 3 Dec 2025 722nd Yewzir 🇧🇪 724 94 11ms 30 Nov 2025 723rd bitsandbeyond 🇳🇱 723 73 89ms 2 Nov 2025 724th HumanoidCPU 721 85 2ms 29 Nov 2025 725th cros107 🇦🇺 720 70 12ms 11 Nov 2025 725th CutSandstone 720 70 12ms 4 Dec 2025 725th jameswmccarty 720 70 12ms 3 Jan 2026 725th zgialor-lab 720 70 12ms 1 Feb 2026 725th btjones0 720 70 11ms 16 Feb 2026 725th bzijlema 🇳🇱 720 70 12ms 26 Feb 2026 731st plcc0 718 69 5ms 24 days ago 732nd rucin93 🇵🇱 717 68 1ms 30 Oct 2025 733rd albanian-laundromat 717 87 433ms 30 Nov 2025 734th tomh1012 716 95 11ms 12 Feb 2026 734th madex 🇩🇪 716 95 8ms 13 days ago 736th emplv 🇱🇻 715 62 12ms 30 Oct 2025 736th Lv0Sys 🇵🇱 715 62 10ms 21 Feb 2026 738th aksyristos 713 86 2ms 24 days ago 739th MeWhenI 🇻🇦 713 98 42ms 24 Nov 2025 740th tomh1012 710 108 9ms 12 Feb 2026 741st albanian-laundromat 709 107 25ms 30 Oct 2025 741st HumanoidCPU 709 107 28ms 1 Dec 2025 741st Natanaelel 🇸🇪 709 107 24ms 25 Dec 2025 744th albanian-laundromat 707 90 3ms 14 Dec 2025 745th BREMAUCY 🇫🇷 705 104 66ms 2 Dec 2025 746th Yewzir 🇧🇪 704 102 9ms 30 Nov 2025 747th albanian-laundromat 700 111 2,534ms 23 Nov 2025 748th TheZwierzLF 🇵🇱 698 71 469ms 12 Dec 2025 748th emgordon154 698 71 5ms 26 days ago 750th albanian-laundromat 696 86 112ms 23 Nov 2025 751st zgialor-lab 696 88 2ms 16 Dec 2025 751st jgbaldwinbrown 696 88 2ms 15 Jan 2026 753rd GolfingSuccess 🇬🇷 694 98 9ms 30 Nov 2025 754th madex 🇩🇪 693 64 9ms 12 days ago 755th emgordon154 692 58 49ms 21 Feb 2026 756th bitsandbeyond 🇳🇱 691 68 4ms 1 Nov 2025 757th HumanoidCPU 691 101 44ms 30 Nov 2025 758th anter69 🇭🇺 690 73 11ms 10 Nov 2025 758th ahmetdemirag 🇨🇾 690 73 11ms 28 Nov 2025 758th Yewzir 🇧🇪 690 73 12ms 30 Nov 2025 758th SirBogman 🇺🇸 690 73 11ms 1 Dec 2025 758th csharpython 690 73 11ms 6 Jan 2026 758th themoonisacheese 690 73 11ms 23 Jan 2026 764th albanian-laundromat 690 91 4ms 24 Nov 2025 765th dokutan 689 72 5ms 28 Nov 2025 765th HumanoidCPU 689 72 448ms 29 Nov 2025 767th albanian-laundromat 689 73 83ms 24 Nov 2025 768th BREMAUCY 🇫🇷 687 99 8ms 2 Dec 2025 768th Schmitt-Very-Cool 687 99 7ms 6 Dec 2025 770th D-MOVE 🇵🇭 686 117 26ms 4 Feb 2026 770th JOrE20 686 117 25ms 9 Feb 2026 772nd ndren 685 79 2ms 22 days ago 773rd bitsandbeyond 🇳🇱 684 94 10ms 31 Dec 2025 774th Yewzir 🇧🇪 684 122 300ms 30 Nov 2025 774th D-MOVE 🇵🇭 684 122 269ms 16 Feb 2026 774th prestosilver 🇺🇸 684 122 288ms 24 days ago 777th Babafaba 681 74 13ms 21 Nov 2025 777th JOrE20 681 74 11ms 21 Nov 2025 777th HumanoidCPU 681 74 11ms 29 Nov 2025 777th TheZwierzLF 🇵🇱 681 74 11ms 29 Nov 2025 777th BREMAUCY 🇫🇷 681 74 11ms 30 Nov 2025 777th RandGuy 681 74 11ms 2 Dec 2025 777th annaproxy 681 74 11ms 2 Dec 2025 777th aksyristos 681 74 11ms 3 Dec 2025 777th hippalectryon-0 681 74 12ms 6 Dec 2025 777th SB-945 681 74 12ms 19 Dec 2025 777th te-chnical 681 74 12ms 23 Dec 2025 777th FlorianCassayre 🇫🇷 681 74 18ms 8 Feb 2026 777th xiaoyiming123 681 74 12ms 10 days ago 777th jumpingtj 681 74 12ms 4 days ago 791st Herbert00709 🇵🇱 680 59 52ms 3 days ago 792nd HumanoidCPU 680 88 109ms 30 Nov 2025 793rd CaedenHarper 🇨🇦 680 117 118ms 30 Nov 2025 794th Yewzir 🇧🇪 679 73 414ms 30 Nov 2025 795th albanian-laundromat 679 99 117ms 30 Oct 2025 796th anter69 🇭🇺 679 105 84ms 26 days ago 797th jameswmccarty 678 123 287ms 8 Feb 2026 798th YAJUE114514 676 80 2ms 22 days ago 799th Jacob385 673 105 450ms 10 Nov 2025 800th Natanaelel 🇸🇪 673 106 122ms 26 days ago First Prev 721–800 of 1,478 Next Last