The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 46 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 881st RDShah 607 83 11ms 1 Dec 2025 882nd MeWhenI 🇻🇦 607 100 6ms 24 Nov 2025 883rd anter69 🇭🇺 606 74 35ms 5 Dec 2025 883rd TheZwierzLF 🇵🇱 606 74 36ms 5 Jan 2026 885th tomh1012 606 103 427ms 12 Feb 2026 886th albanian-laundromat 605 82 5ms 25 Nov 2025 887th MeWhenI 🇻🇦 605 111 123ms 24 Nov 2025 888th HumanoidCPU 604 99 7ms 1 Dec 2025 889th Schmitt-Very-Cool 604 127 8ms 6 Dec 2025 890th HumanoidCPU 601 107 10ms 29 Nov 2025 891st HumanoidCPU 600 74 145ms 29 Nov 2025 892nd ZakkkkAttackkkk 🇵🇭 600 84 17ms 2 Feb 2026 893rd CaedenHarper 🇨🇦 600 88 90ms 30 Nov 2025 894th Natanaelel 🇸🇪 600 139 288ms 25 Dec 2025 895th CatsAreFluffy 599 67 53ms 30 Oct 2025 896th Nicronmil 599 74 11ms 11 Dec 2025 896th two-bad 🇬🇧 599 74 10ms 17 Dec 2025 898th olleicua 🇺🇸 598 75 34ms 7 Dec 2025 899th JOrE20 597 81 727ms 30 Jan 2026 900th CaedenHarper 🇨🇦 596 81 296ms 30 Nov 2025 901st KatieLG 🇬🇧 596 108 10ms 30 Nov 2025 902nd tomh1012 595 120 136ms 27 days ago 903rd HumanoidCPU 594 105 378ms 29 Nov 2025 904th BREMAUCY 🇫🇷 592 141 290ms 2 Dec 2025 904th JOrE20 592 141 298ms 30 Jan 2026 906th anter69 🇭🇺 589 77 1,267ms 5 Dec 2025 907th Yewzir 🇧🇪 589 82 338ms 30 Nov 2025 908th kmathis22 589 120 406ms 24 days ago 909th aksyristos 588 83 1ms 3 Dec 2025 910th SwordF-Official 🇺🇸 588 92 2ms 16 Nov 2025 910th HumanoidCPU 588 92 2ms 29 Nov 2025 910th tomh1012 588 92 2ms 27 days ago 910th prestosilver 🇺🇸 588 92 2ms 27 days ago 910th BREMAUCY 🇫🇷 588 92 2ms 27 days ago 910th m-tkach 🇺🇦 588 92 2ms 27 days ago 916th tomh1012 587 142 283ms 12 Feb 2026 917th Schmitt-Very-Cool 586 86 11ms 5 Dec 2025 918th Protothor 584 76 10ms 4 Dec 2025 918th Andrey-Plotnikov 584 76 10ms 9 Jan 2026 920th dokutan 583 73 200ms 28 Nov 2025 921st aksyristos 582 93 2ms 26 days ago 922nd MeWhenI 🇻🇦 580 111 17ms 28 Nov 2025 923rd emgordon154 578 56 4ms 11 days ago 924th Maashau 578 106 2ms 1 Dec 2025 925th kmathis22 576 84 780ms 9 days ago 926th BREMAUCY 🇫🇷 575 78 34ms 1 Dec 2025 927th kmathis22 575 145 278ms 10 days ago 928th HumanoidCPU 575 181 1,852ms 30 Nov 2025 929th BREMAUCY 🇫🇷 573 109 469ms 1 Dec 2025 930th Schmitt-Very-Cool 573 128 69ms 6 Dec 2025 931st FortuiteMan 🇫🇷 566 120 11ms 24 Dec 2025 932nd bitsandbeyond 🇳🇱 565 71 50ms 7 Nov 2025 933rd MeWhenI 🇻🇦 564 74 104ms 24 Nov 2025 934th msbranicky 563 96 2ms 27 days ago 934th Jonson26 563 96 2ms 24 days ago 936th CaedenHarper 🇨🇦 562 121 12ms 30 Nov 2025 937th jameswmccarty 561 79 13ms 8 Feb 2026 938th AstroOrbis 558 122 10ms 12 days ago 939th kmathis22 554 91 11ms 10 days ago 940th bitsandbeyond 🇳🇱 553 107 4ms 16 Nov 2025 941st IISResetMe 551 90 5ms 27 days ago 942nd SirBogman 🇺🇸 549 59 3ms 2 Dec 2025 943rd HumanoidCPU 549 88 323ms 30 Nov 2025 944th Stockoh 🇫🇷 548 92 11ms 9 Jan 2026 945th jameswmccarty 548 129 379ms 9 hours ago 946th matejmatik123 🇸🇰 547 142 1,403ms 16 Jan 2026 947th Yewzir 🇧🇪 545 91 5ms 27 days ago 947th kmathis22 545 91 430ms 9 days ago 949th scpchicken 🇵🇼 544 125 10ms 1 Jan 2026 950th Schmitt-Very-Cool 544 130 463ms 1 Dec 2025 951st CLOStrophobic 🇮🇹 542 93 10ms 3 Dec 2025 952nd emgordon154 541 79 3ms 24 Nov 2025 953rd albanian-laundromat 541 104 1,265ms 30 Oct 2025 954th Stockoh 🇫🇷 539 92 435ms 9 Jan 2026 955th professor-l 536 94 11ms 10 hours ago 956th Matter1024 🇮🇳 536 101 2ms 27 days ago 957th lacrosse 534 84 40ms 29 Nov 2025 958th Schmitt-Very-Cool 534 142 26ms 5 Dec 2025 959th scpchicken 🇵🇼 531 61 2ms 18 days ago 960th HumanoidCPU 529 95 117ms 29 Nov 2025 First Prev 881–960 of 1,480 Next Last