The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 35 hours. 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 396th plcc0 881 70 2,571ms 26 days ago 396th Chinay-Domitrix 🇺🇸 881 70 2,561ms 16 days ago 396th madex 🇩🇪 881 70 2,476ms 14 days ago 404th Lv0Sys 🇵🇱 881 84 441ms 1 Mar 2026 405th edsrzf 🇳🇿 881 116 1,489ms 3 Dec 2025 406th stefangimmillaro 880 51 37ms 30 Oct 2025 406th GrayJoKing 🇦🇺 880 51 39ms 3 Dec 2025 408th DialFrost 🇸🇬 880 55 902ms 2 Dec 2025 408th fuzzylojik-golf 🇺🇸 880 55 759ms 3 days ago 410th Shanethegamer 🇺🇸 880 62 123ms 3 Nov 2025 410th MeWhenI 🇻🇦 880 62 122ms 24 Nov 2025 410th edsrzf 🇳🇿 880 62 128ms 1 Dec 2025 413th Shanethegamer 🇺🇸 880 68 110ms 4 Nov 2025 413th fuzzylojik-golf 🇺🇸 880 68 107ms 15 days ago 415th bitsandbeyond 🇳🇱 880 104 7ms 2 Nov 2025 416th sean-niemann 🇺🇸 879 60 88ms 2 Dec 2025 417th JayXon 🇺🇸 879 64 1,293ms 22 Dec 2025 418th madex 🇩🇪 878 55 266ms 13 days ago 419th CaedenHarper 🇨🇦 878 95 288ms 4 Dec 2025 420th Shanethegamer 🇺🇸 876 70 2ms 4 Nov 2025 420th MeWhenI 🇻🇦 876 70 2ms 21 Nov 2025 422nd MeWhenI 🇻🇦 876 75 123ms 23 Nov 2025 422nd Natanaelel 🇸🇪 876 75 126ms 4 Jan 2026 424th MeWhenI 🇻🇦 875 37 2ms 21 Nov 2025 425th primo-ppcg 🇹🇭 875 208 14ms 25 Jan 2026 426th JayXon 🇺🇸 874 119 1,909ms 20 Dec 2025 427th Yax42 🇫🇷 873 81 476ms 9 Jan 2026 428th MeWhenI 🇻🇦 873 92 25ms 24 Nov 2025 428th emgordon154 873 92 26ms 30 hours ago 430th canissimia 🇦🇶 873 179 33ms 24 Dec 2025 431st rucin93 🇵🇱 872 62 2ms 31 Oct 2025 431st dokutan 872 62 2ms 28 Nov 2025 431st snoozingnewt 🇨🇦 872 62 2ms 2 Mar 2026 431st plcc0 872 62 2ms 26 days ago 435th sean-niemann 🇺🇸 872 72 4ms 18 Dec 2025 435th Steffan153 🇫🇮 872 72 4ms 27 days ago 437th sean-niemann 🇺🇸 872 88 8ms 18 Dec 2025 438th MeWhenI 🇻🇦 872 89 71ms 21 Nov 2025 439th GolfingSuccess 🇬🇷 871 51 144ms 3 Nov 2025 439th Steffan153 🇫🇮 871 51 149ms 27 days ago 441st emgordon154 871 85 425ms 21 Dec 2025 441st fuzzylojik-golf 🇺🇸 871 85 412ms 22 days ago 443rd pardouin 🇫🇷 871 87 26ms 25 Feb 2026 444th targrik 870 51 10ms 30 Oct 2025 444th luuumine 🇫🇷 870 51 11ms 3 Dec 2025 444th emgordon154 870 51 11ms 21 Dec 2025 447th pardouin 🇫🇷 870 54 4ms 27 days ago 448th stefangimmillaro 870 57 5ms 31 Oct 2025 448th Kacarott 🇦🇺 870 57 395ms 30 Nov 2025 448th KatieLG 🇬🇧 870 57 411ms 30 Nov 2025 448th edsrzf 🇳🇿 870 57 444ms 1 Dec 2025 448th Natanaelel 🇸🇪 870 57 443ms 25 Dec 2025 453rd bitsandbeyond 🇳🇱 870 72 41ms 1 Nov 2025 454th snoozingnewt 🇨🇦 870 78 39ms 11 Dec 2025 455th rucin93 🇵🇱 869 58 11ms 30 Oct 2025 455th snoozingnewt 🇨🇦 869 58 12ms 28 Feb 2026 457th GolfingSuccess 🇬🇷 869 74 14ms 15 Nov 2025 457th Steffan153 🇫🇮 869 74 14ms 27 days ago 459th DialFrost 🇸🇬 869 96 282ms 21 Dec 2025 460th KatieLG 🇬🇧 869 98 2ms 1 Dec 2025 461st Shanethegamer 🇺🇸 868 49 364ms 3 Nov 2025 462nd Yax42 🇫🇷 867 72 504ms 29 Nov 2025 463rd MeWhenI 🇻🇦 864 56 914ms 24 Nov 2025 463rd plcc0 864 56 750ms 12 days ago 465th madex 🇩🇪 864 76 127ms 14 days ago 466th bitsandbeyond 🇳🇱 863 52 35ms 1 Nov 2025 467th iczelia 🇩🇪 863 71 2ms 1 Dec 2025 468th pardouin 🇫🇷 863 85 62ms 1 Dec 2025 469th CaedenHarper 🇨🇦 863 90 452ms 29 Nov 2025 469th BlankSpruce 863 90 67ms 6 Dec 2025 469th TheSecondComing123 863 90 59ms 24 Feb 2026 472nd bitsandbeyond 🇳🇱 863 93 26ms 1 Nov 2025 473rd vhoulbreque 🇫🇷 863 106 8ms 1 Dec 2025 474th bitsandbeyond 🇳🇱 862 82 473ms 3 Jan 2026 475th bitsandbeyond 🇳🇱 860 83 88ms 31 Oct 2025 476th bitsandbeyond 🇳🇱 860 97 295ms 1 Nov 2025 477th jared-hughes 859 63 2ms 27 days ago 478th MeWhenI 🇻🇦 859 79 40ms 23 Nov 2025 479th albanian-laundromat 859 119 1,424ms 30 Oct 2025 480th dokutan 857 72 2,665ms 28 Nov 2025 First Prev 401–480 of 1,480 Next Last