The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 anter69 🇭🇺 606 74 35ms 5 Dec 2025 881st TheZwierzLF 🇵🇱 606 74 36ms 5 Jan 2026 883rd tomh1012 606 103 427ms 12 Feb 2026 884th albanian-laundromat 605 82 5ms 25 Nov 2025 885th MeWhenI 🇻🇦 605 111 123ms 24 Nov 2025 886th HumanoidCPU 604 99 7ms 1 Dec 2025 887th Schmitt-Very-Cool 604 127 8ms 6 Dec 2025 888th HumanoidCPU 601 107 10ms 29 Nov 2025 889th HumanoidCPU 600 74 145ms 29 Nov 2025 890th ZakkkkAttackkkk 🇵🇭 600 84 17ms 2 Feb 2026 891st CaedenHarper 🇨🇦 600 88 90ms 30 Nov 2025 892nd Natanaelel 🇸🇪 600 139 288ms 25 Dec 2025 893rd CatsAreFluffy 599 67 53ms 30 Oct 2025 894th Nicronmil 599 74 11ms 11 Dec 2025 894th two-bad 🇬🇧 599 74 10ms 17 Dec 2025 896th olleicua 🇺🇸 598 75 34ms 7 Dec 2025 897th JOrE20 597 81 727ms 30 Jan 2026 898th CaedenHarper 🇨🇦 596 81 296ms 30 Nov 2025 899th KatieLG 🇬🇧 596 108 10ms 30 Nov 2025 900th tomh1012 595 120 136ms 25 days ago 901st HumanoidCPU 594 105 378ms 29 Nov 2025 902nd BREMAUCY 🇫🇷 592 141 290ms 2 Dec 2025 902nd JOrE20 592 141 298ms 30 Jan 2026 904th anter69 🇭🇺 589 77 1,267ms 5 Dec 2025 905th Yewzir 🇧🇪 589 82 338ms 30 Nov 2025 906th kmathis22 589 120 406ms 21 days ago 907th aksyristos 588 83 1ms 3 Dec 2025 908th SwordF-Official 🇺🇸 588 92 2ms 16 Nov 2025 908th HumanoidCPU 588 92 2ms 29 Nov 2025 908th tomh1012 588 92 2ms 25 days ago 908th prestosilver 🇺🇸 588 92 2ms 24 days ago 908th BREMAUCY 🇫🇷 588 92 2ms 24 days ago 908th m-tkach 🇺🇦 588 92 2ms 24 days ago 914th tomh1012 587 142 283ms 12 Feb 2026 915th Schmitt-Very-Cool 586 86 11ms 5 Dec 2025 916th Protothor 584 76 10ms 4 Dec 2025 916th Andrey-Plotnikov 584 76 10ms 9 Jan 2026 918th dokutan 583 73 200ms 28 Nov 2025 919th aksyristos 582 93 2ms 23 days ago 920th MeWhenI 🇻🇦 580 111 17ms 28 Nov 2025 921st emgordon154 578 56 4ms 9 days ago 922nd Maashau 578 106 2ms 1 Dec 2025 923rd kmathis22 576 84 780ms 6 days ago 924th BREMAUCY 🇫🇷 575 78 34ms 1 Dec 2025 925th kmathis22 575 145 278ms 7 days ago 926th HumanoidCPU 575 181 1,852ms 30 Nov 2025 927th BREMAUCY 🇫🇷 573 109 469ms 1 Dec 2025 928th Schmitt-Very-Cool 573 128 69ms 6 Dec 2025 929th FortuiteMan 🇫🇷 566 120 11ms 24 Dec 2025 930th bitsandbeyond 🇳🇱 565 71 50ms 7 Nov 2025 931st MeWhenI 🇻🇦 564 74 104ms 24 Nov 2025 932nd msbranicky 563 96 2ms 24 days ago 932nd Jonson26 563 96 2ms 22 days ago 934th CaedenHarper 🇨🇦 562 121 12ms 30 Nov 2025 935th jameswmccarty 561 79 13ms 8 Feb 2026 936th AstroOrbis 558 122 10ms 9 days ago 937th kmathis22 554 91 11ms 7 days ago 938th bitsandbeyond 🇳🇱 553 107 4ms 16 Nov 2025 939th IISResetMe 551 90 5ms 25 days ago 940th SirBogman 🇺🇸 549 59 3ms 2 Dec 2025 941st HumanoidCPU 549 88 323ms 30 Nov 2025 942nd Stockoh 🇫🇷 548 92 11ms 9 Jan 2026 943rd matejmatik123 🇸🇰 547 142 1,403ms 16 Jan 2026 944th Yewzir 🇧🇪 545 91 5ms 25 days ago 944th kmathis22 545 91 430ms 6 days ago 946th scpchicken 🇵🇼 544 125 10ms 1 Jan 2026 947th Schmitt-Very-Cool 544 130 463ms 1 Dec 2025 948th CLOStrophobic 🇮🇹 542 93 10ms 3 Dec 2025 949th emgordon154 541 79 3ms 24 Nov 2025 950th albanian-laundromat 541 104 1,265ms 30 Oct 2025 951st Stockoh 🇫🇷 539 92 435ms 9 Jan 2026 952nd Matter1024 🇮🇳 536 101 2ms 25 days ago 953rd lacrosse 534 84 40ms 29 Nov 2025 954th Schmitt-Very-Cool 534 142 26ms 5 Dec 2025 955th scpchicken 🇵🇼 531 61 2ms 15 days ago 956th HumanoidCPU 529 95 117ms 29 Nov 2025 957th aksyristos 528 85 36ms 3 Dec 2025 958th tomh1012 527 94 5ms 25 days ago 959th logalex8369 🇺🇸 525 96 10ms 18 Dec 2025 960th Schmitt-Very-Cool 521 160 290ms 5 Dec 2025 First Prev 881–960 of 1,477 Next Last