The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 MeWhenI 🇻🇦 607 100 6ms 24 Nov 2025 882nd anter69 🇭🇺 606 74 35ms 5 Dec 2025 882nd TheZwierzLF 🇵🇱 606 74 36ms 5 Jan 2026 884th tomh1012 606 103 427ms 12 Feb 2026 885th albanian-laundromat 605 82 5ms 25 Nov 2025 886th MeWhenI 🇻🇦 605 111 123ms 24 Nov 2025 887th HumanoidCPU 604 99 7ms 1 Dec 2025 888th Schmitt-Very-Cool 604 127 8ms 6 Dec 2025 889th HumanoidCPU 601 107 10ms 29 Nov 2025 890th HumanoidCPU 600 74 145ms 29 Nov 2025 891st ZakkkkAttackkkk 🇵🇭 600 84 17ms 2 Feb 2026 892nd CaedenHarper 🇨🇦 600 88 90ms 30 Nov 2025 893rd Natanaelel 🇸🇪 600 139 288ms 25 Dec 2025 894th CatsAreFluffy 599 67 53ms 30 Oct 2025 895th Nicronmil 599 74 11ms 11 Dec 2025 895th two-bad 🇬🇧 599 74 10ms 17 Dec 2025 897th olleicua 🇺🇸 598 75 34ms 7 Dec 2025 898th JOrE20 597 81 727ms 30 Jan 2026 899th CaedenHarper 🇨🇦 596 81 296ms 30 Nov 2025 900th KatieLG 🇬🇧 596 108 10ms 30 Nov 2025 901st tomh1012 595 120 136ms 26 days ago 902nd HumanoidCPU 594 105 378ms 29 Nov 2025 903rd BREMAUCY 🇫🇷 592 141 290ms 2 Dec 2025 903rd JOrE20 592 141 298ms 30 Jan 2026 905th anter69 🇭🇺 589 77 1,267ms 5 Dec 2025 906th Yewzir 🇧🇪 589 82 338ms 30 Nov 2025 907th kmathis22 589 120 406ms 22 days ago 908th aksyristos 588 83 1ms 3 Dec 2025 909th SwordF-Official 🇺🇸 588 92 2ms 16 Nov 2025 909th HumanoidCPU 588 92 2ms 29 Nov 2025 909th tomh1012 588 92 2ms 26 days ago 909th prestosilver 🇺🇸 588 92 2ms 26 days ago 909th BREMAUCY 🇫🇷 588 92 2ms 26 days ago 909th m-tkach 🇺🇦 588 92 2ms 25 days ago 915th tomh1012 587 142 283ms 12 Feb 2026 916th Schmitt-Very-Cool 586 86 11ms 5 Dec 2025 917th Protothor 584 76 10ms 4 Dec 2025 917th Andrey-Plotnikov 584 76 10ms 9 Jan 2026 919th dokutan 583 73 200ms 28 Nov 2025 920th aksyristos 582 93 2ms 25 days ago 921st MeWhenI 🇻🇦 580 111 17ms 28 Nov 2025 922nd emgordon154 578 56 4ms 10 days ago 923rd Maashau 578 106 2ms 1 Dec 2025 924th kmathis22 576 84 780ms 8 days ago 925th BREMAUCY 🇫🇷 575 78 34ms 1 Dec 2025 926th kmathis22 575 145 278ms 9 days ago 927th HumanoidCPU 575 181 1,852ms 30 Nov 2025 928th BREMAUCY 🇫🇷 573 109 469ms 1 Dec 2025 929th Schmitt-Very-Cool 573 128 69ms 6 Dec 2025 930th FortuiteMan 🇫🇷 566 120 11ms 24 Dec 2025 931st bitsandbeyond 🇳🇱 565 71 50ms 7 Nov 2025 932nd MeWhenI 🇻🇦 564 74 104ms 24 Nov 2025 933rd msbranicky 563 96 2ms 25 days ago 933rd Jonson26 563 96 2ms 23 days ago 935th CaedenHarper 🇨🇦 562 121 12ms 30 Nov 2025 936th jameswmccarty 561 79 13ms 8 Feb 2026 937th AstroOrbis 558 122 10ms 10 days ago 938th kmathis22 554 91 11ms 9 days ago 939th bitsandbeyond 🇳🇱 553 107 4ms 16 Nov 2025 940th IISResetMe 551 90 5ms 26 days ago 941st SirBogman 🇺🇸 549 59 3ms 2 Dec 2025 942nd HumanoidCPU 549 88 323ms 30 Nov 2025 943rd Stockoh 🇫🇷 548 92 11ms 9 Jan 2026 944th matejmatik123 🇸🇰 547 142 1,403ms 16 Jan 2026 945th Yewzir 🇧🇪 545 91 5ms 26 days ago 945th kmathis22 545 91 430ms 8 days ago 947th scpchicken 🇵🇼 544 125 10ms 1 Jan 2026 948th Schmitt-Very-Cool 544 130 463ms 1 Dec 2025 949th CLOStrophobic 🇮🇹 542 93 10ms 3 Dec 2025 950th emgordon154 541 79 3ms 24 Nov 2025 951st albanian-laundromat 541 104 1,265ms 30 Oct 2025 952nd Stockoh 🇫🇷 539 92 435ms 9 Jan 2026 953rd Matter1024 🇮🇳 536 101 2ms 26 days ago 954th lacrosse 534 84 40ms 29 Nov 2025 955th Schmitt-Very-Cool 534 142 26ms 5 Dec 2025 956th scpchicken 🇵🇼 531 61 2ms 16 days ago 957th HumanoidCPU 529 95 117ms 29 Nov 2025 958th aksyristos 528 85 36ms 3 Dec 2025 959th tomh1012 527 94 5ms 26 days ago 960th logalex8369 🇺🇸 525 96 10ms 18 Dec 2025 First Prev 881–960 of 1,478 Next Last