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 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 albanian-laundromat 605 82 5ms 25 Nov 2025 882nd MeWhenI 🇻🇦 605 111 123ms 24 Nov 2025 883rd HumanoidCPU 604 99 7ms 1 Dec 2025 884th Schmitt-Very-Cool 604 127 8ms 6 Dec 2025 885th HumanoidCPU 601 107 10ms 29 Nov 2025 886th HumanoidCPU 600 74 145ms 29 Nov 2025 887th ZakkkkAttackkkk 🇵🇭 600 84 17ms 2 Feb 2026 888th CaedenHarper 🇨🇦 600 88 90ms 30 Nov 2025 889th Natanaelel 🇸🇪 600 139 288ms 25 Dec 2025 890th Nicronmil 599 74 10ms 11 Dec 2025 890th two-bad 🇬🇧 599 74 9ms 17 Dec 2025 892nd CatsAreFluffy 598 67 53ms 30 Oct 2025 893rd olleicua 🇺🇸 598 75 34ms 7 Dec 2025 894th JOrE20 597 81 727ms 30 Jan 2026 895th CaedenHarper 🇨🇦 596 81 296ms 30 Nov 2025 896th KatieLG 🇬🇧 596 108 10ms 30 Nov 2025 897th tomh1012 595 120 136ms 21 days ago 898th HumanoidCPU 594 105 378ms 29 Nov 2025 899th BREMAUCY 🇫🇷 592 141 290ms 2 Dec 2025 899th JOrE20 592 141 298ms 30 Jan 2026 901st anter69 🇭🇺 589 77 1,267ms 5 Dec 2025 902nd Yewzir 🇧🇪 589 82 338ms 30 Nov 2025 903rd kmathis22 589 120 406ms 18 days ago 904th aksyristos 588 83 1ms 3 Dec 2025 905th SwordF-Official 🇺🇸 588 92 2ms 16 Nov 2025 905th HumanoidCPU 588 92 2ms 29 Nov 2025 905th tomh1012 588 92 2ms 21 days ago 905th prestosilver 🇺🇸 588 92 2ms 21 days ago 905th BREMAUCY 🇫🇷 588 92 2ms 21 days ago 905th m-tkach 🇺🇦 588 92 2ms 21 days ago 911th tomh1012 587 142 283ms 12 Feb 2026 912th Schmitt-Very-Cool 586 86 11ms 5 Dec 2025 913th Protothor 584 76 26ms 4 Dec 2025 913th Andrey-Plotnikov 584 76 14ms 9 Jan 2026 915th dokutan 583 73 200ms 28 Nov 2025 916th aksyristos 582 93 2ms 20 days ago 917th MeWhenI 🇻🇦 580 111 17ms 28 Nov 2025 918th emgordon154 578 56 4ms 5 days ago 919th Maashau 578 106 2ms 1 Dec 2025 920th kmathis22 576 84 780ms 3 days ago 921st BREMAUCY 🇫🇷 575 78 34ms 1 Dec 2025 922nd kmathis22 575 145 278ms 4 days ago 923rd HumanoidCPU 575 181 1,852ms 30 Nov 2025 924th BREMAUCY 🇫🇷 573 109 469ms 1 Dec 2025 925th Schmitt-Very-Cool 573 128 69ms 6 Dec 2025 926th FortuiteMan 🇫🇷 566 120 11ms 24 Dec 2025 927th bitsandbeyond 🇳🇱 564 71 50ms 7 Nov 2025 928th MeWhenI 🇻🇦 564 74 104ms 24 Nov 2025 929th msbranicky 563 96 2ms 21 days ago 929th Jonson26 563 96 2ms 18 days ago 931st CaedenHarper 🇨🇦 562 121 12ms 30 Nov 2025 932nd jameswmccarty 561 79 14ms 8 Feb 2026 933rd AstroOrbis 558 122 10ms 5 days ago 934th kmathis22 554 91 11ms 4 days ago 935th bitsandbeyond 🇳🇱 553 107 4ms 16 Nov 2025 936th IISResetMe 551 90 5ms 21 days ago 937th SirBogman 🇺🇸 549 59 3ms 2 Dec 2025 938th HumanoidCPU 549 88 323ms 30 Nov 2025 939th Stockoh 🇫🇷 548 92 11ms 9 Jan 2026 940th matejmatik123 🇸🇰 547 142 1,307ms 16 Jan 2026 941st Yewzir 🇧🇪 545 91 5ms 21 days ago 941st kmathis22 545 91 430ms 3 days ago 943rd scpchicken 🇵🇼 544 125 10ms 1 Jan 2026 944th Schmitt-Very-Cool 544 130 463ms 1 Dec 2025 945th CLOStrophobic 🇮🇹 542 93 10ms 3 Dec 2025 946th emgordon154 541 79 3ms 24 Nov 2025 947th albanian-laundromat 541 104 1,265ms 30 Oct 2025 948th Stockoh 🇫🇷 539 92 435ms 9 Jan 2026 949th Matter1024 🇮🇳 536 101 2ms 21 days ago 950th lacrosse 534 84 40ms 29 Nov 2025 951st Schmitt-Very-Cool 534 142 26ms 5 Dec 2025 952nd scpchicken 🇵🇼 531 61 2ms 11 days ago 953rd HumanoidCPU 529 95 79ms 29 Nov 2025 954th aksyristos 528 85 36ms 3 Dec 2025 955th tomh1012 527 94 5ms 21 days ago 956th logalex8369 🇺🇸 525 96 10ms 18 Dec 2025 957th Schmitt-Very-Cool 521 160 290ms 5 Dec 2025 958th aksyristos 519 146 27ms 3 Dec 2025 959th JRaspass 🇬🇧 516 96 5ms 21 days ago 960th GolfingSuccess 🇬🇷 516 143 5ms 5 Jan 2026 First Prev 881–960 of 1,474 Next Last