The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Tower of Hanoi in Python 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 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 Chars Time Submitted 80th CutSandstone 729 70 12ms 4 Dec 2025 80th jameswmccarty 729 70 12ms 3 Jan 2026 80th zgialor-lab 729 70 12ms 1 Feb 2026 80th btjones0 729 70 11ms 16 Feb 2026 80th bzijlema 🇳🇱 729 70 12ms 25 days ago 86th ahmetdemirag 🇨🇾 699 73 11ms 28 Nov 2025 86th SirBogman 🇺🇸 699 73 11ms 1 Dec 2025 86th csharpython 699 73 11ms 6 Jan 2026 86th themoonisacheese 699 73 11ms 23 Jan 2026 90th Babafaba 689 74 13ms 21 Nov 2025 90th TheZwierzLF 🇵🇱 689 74 11ms 29 Nov 2025 90th BREMAUCY 🇫🇷 689 74 11ms 30 Nov 2025 90th RandGuy 689 74 11ms 2 Dec 2025 90th annaproxy 689 74 11ms 2 Dec 2025 90th aksyristos 689 74 11ms 3 Dec 2025 90th hippalectryon-0 689 74 12ms 6 Dec 2025 90th te-chnical 689 74 12ms 23 Dec 2025 90th jumpingtj 689 74 12ms 5 hours ago 99th LostSyntax21 🇬🇧 680 75 18ms 30 Nov 2025 99th firegene 🇮🇪 680 75 11ms 20 Feb 2026 101st Ripick 671 76 11ms 14 Nov 2025 101st scpchicken 🇵🇼 671 76 12ms 5 Dec 2025 103rd mousetail 🇳🇱 662 77 12ms 23 Nov 2025 104th Bmrl7 654 78 11ms 20 Dec 2025 105th msbranicky 646 79 11ms 26 Nov 2025 105th nemoyatpeace 646 79 16ms 28 Dec 2025 105th nstearns96 🇬🇧 646 79 11ms 31 Dec 2025 105th tomh1012 646 79 10ms 21 days ago 105th Andrey2001 646 79 11ms 12 hours ago 110th RDShah 614 83 11ms 1 Dec 2025 111th ZakkkkAttackkkk 🇵🇭 607 84 17ms 2 Feb 2026 112th Schmitt-Very-Cool 593 86 11ms 5 Dec 2025 113th kmathis22 560 91 11ms 4 days ago 114th Stockoh 🇫🇷 554 92 11ms 9 Jan 2026 115th CLOStrophobic 🇮🇹 548 93 10ms 3 Dec 2025 116th logalex8369 🇺🇸 531 96 10ms 18 Dec 2025 117th OllieBoyne 🇬🇧 520 98 12ms 11 Dec 2025 118th 4ndyJ 🇬🇧 510 100 12ms 31 Dec 2025 119th AstroOrbis 500 102 10ms 17 Feb 2026 120th DrPrettyman 477 107 19ms 22 Dec 2025 121st robbertvz 447 114 12ms 15 Dec 2025 122nd AidanWalter 285 179 11ms 6 days ago 123rd CheeseCake628 🇳🇴 232 220 12ms 31 Dec 2025 124th averagepythondev 14 3,589 11ms 2 Jan 2026 124th Jacob385 14 3,589 11ms 9 Jan 2026 124th RJFuller 14 3,589 11ms 18 days ago 127th TaserTheFox 🇺🇸 14 3,590 11ms 22 Jan 2026 128th gigaprofisi 🇺🇸 14 3,613 11ms 17 Dec 2025 129th KatieLG-Transpiler 🇬🇧 12 4,099 11ms 9 Jan 2026 First Prev 81–129 of 129
