The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 34 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 321st kg583 🇺🇸 895 78 40ms 30 Oct 2025 321st edsrzf 🇳🇿 895 78 41ms 31 Oct 2025 323rd Shanethegamer 🇺🇸 895 79 500ms 4 Nov 2025 323rd MeWhenI 🇻🇦 895 79 388ms 21 Nov 2025 323rd snoozingnewt 🇨🇦 895 79 586ms 28 Nov 2025 326th janAkali 🇷🇺 894 61 129ms 24 days ago 327th snoozingnewt 🇨🇦 894 69 2,568ms 30 Nov 2025 328th MeWhenI 🇻🇦 894 76 11ms 23 Nov 2025 329th DialFrost 🇸🇬 893 67 117ms 2 Dec 2025 330th edsrzf 🇳🇿 893 81 4ms 4 days ago 330th Steffan153 🇫🇮 893 81 3ms 13 hours ago 332nd sean-niemann 🇺🇸 892 64 3ms 1 Dec 2025 332nd edsrzf 🇳🇿 892 64 3ms 9 days ago 334th bitsandbeyond 🇳🇱 892 70 415ms 1 Nov 2025 335th Shanethegamer 🇺🇸 892 83 465ms 3 Nov 2025 335th MeWhenI 🇻🇦 892 83 450ms 23 Nov 2025 337th Shanethegamer 🇺🇸 892 87 68ms 4 Nov 2025 337th snyderek 🇺🇸 892 87 64ms 2 Dec 2025 337th emgordon154 892 87 61ms 21 Dec 2025 340th m-tkach 🇺🇦 892 90 25ms 1 Dec 2025 340th edsrzf 🇳🇿 892 90 28ms 1 Dec 2025 340th fuzzylojik-golf 🇺🇸 892 90 26ms 18 days ago 343rd lyphyser 891 45 52ms 4 Dec 2025 344th sean-niemann 🇺🇸 889 50 166ms 1 Dec 2025 345th GrayJoKing 🇦🇺 888 47 92ms 3 Dec 2025 345th sean-niemann 🇺🇸 888 47 110ms 18 Dec 2025 347th emgordon154 888 69 2ms 21 Dec 2025 347th Yax42 🇫🇷 888 69 2ms 9 Jan 2026 347th Herbert00709 🇵🇱 888 69 2ms 25 days ago 350th bitsandbeyond 🇳🇱 888 74 123ms 31 Dec 2025 351st edsrzf 🇳🇿 888 96 2ms 28 Nov 2025 352nd KasperKivimaeki 🇫🇮 887 50 10ms 31 Oct 2025 352nd DialFrost 🇸🇬 887 50 11ms 2 Dec 2025 352nd fuzzylojik-golf 🇺🇸 887 50 10ms 22 days ago 355th Steffan153 🇫🇮 887 53 5ms 26 days ago 356th bitsandbeyond 🇳🇱 887 55 1ms 1 Nov 2025 357th janAkali 🇷🇺 887 61 2ms 27 days ago 357th karadigm01 887 61 2ms 22 days ago 359th snoozingnewt 🇨🇦 887 94 299ms 30 Nov 2025 360th ovs-code 🇩🇪 886 48 341ms 29 Nov 2025 361st dokutan 886 54 3ms 28 Nov 2025 362nd AlephSquirrel 885 56 383ms 30 Oct 2025 362nd targrik 885 56 6ms 30 Oct 2025 362nd MeWhenI 🇻🇦 885 56 471ms 23 Nov 2025 362nd CaedenHarper 🇨🇦 885 56 527ms 29 Nov 2025 362nd edsrzf 🇳🇿 885 56 6ms 9 days ago 367th kg583 🇺🇸 884 57 11ms 30 Oct 2025 367th KasperKivimaeki 🇫🇮 884 57 11ms 30 Oct 2025 367th Shanethegamer 🇺🇸 884 57 12ms 3 Nov 2025 367th 4atj 884 57 12ms 5 Nov 2025 367th MeWhenI 🇻🇦 884 57 12ms 21 Nov 2025 367th CaedenHarper 🇨🇦 884 57 12ms 29 Nov 2025 367th blaztoma 🇱🇹 884 57 12ms 30 Nov 2025 367th FortuiteMan 🇫🇷 884 57 12ms 30 Nov 2025 367th KatieLG 🇬🇧 884 57 12ms 30 Nov 2025 367th ryyyn 🇺🇸 884 57 11ms 1 Dec 2025 367th DialFrost 🇸🇬 884 57 12ms 2 Dec 2025 367th fuzzylojik-golf 🇺🇸 884 57 12ms 2 Dec 2025 367th luuumine 🇫🇷 884 57 11ms 3 Dec 2025 367th starfihs 884 57 11ms 4 Dec 2025 367th qpwoeirut 884 57 12ms 7 Dec 2025 367th dominikvytisk 884 57 12ms 8 Dec 2025 367th emgordon154 884 57 11ms 20 Dec 2025 367th Natanaelel 🇸🇪 884 57 12ms 25 Dec 2025 367th 5cw 🇺🇸 884 57 11ms 20 Feb 2026 367th plcc0 884 57 12ms 26 days ago 367th StefanHabel 🇨🇦 884 57 11ms 15 days ago 388th bitsandbeyond 🇳🇱 882 57 92ms 5 Nov 2025 388th MeWhenI 🇻🇦 882 57 216ms 23 Nov 2025 388th snoozingnewt 🇨🇦 882 57 241ms 28 Nov 2025 388th CaedenHarper 🇨🇦 882 57 156ms 30 Nov 2025 392nd kg583 🇺🇸 882 82 3ms 13 hours ago 393rd sean-niemann 🇺🇸 882 86 27ms 2 Dec 2025 393rd edsrzf 🇳🇿 882 86 27ms 8 Feb 2026 395th dokutan 882 91 27ms 1 Dec 2025 396th Shanethegamer 🇺🇸 881 70 2,559ms 4 Nov 2025 396th MeWhenI 🇻🇦 881 70 2,497ms 24 Nov 2025 396th CaedenHarper 🇨🇦 881 70 2,660ms 30 Nov 2025 396th blaztoma 🇱🇹 881 70 2,662ms 2 Dec 2025 396th Natanaelel 🇸🇪 881 70 2,617ms 25 Dec 2025 First Prev 321–400 of 1,480 Next Last