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 800th helbling 🇨🇭 672 66 13ms 12 Dec 2025 800th JOrE20 672 66 10ms 28 Jan 2026 803rd firegene 🇮🇪 672 75 11ms 20 Feb 2026 804th Stockoh 🇫🇷 671 113 28ms 9 Jan 2026 805th BREMAUCY 🇫🇷 670 74 474ms 1 Dec 2025 805th JOrE20 670 74 441ms 7 Jan 2026 805th KrausRaus 🇺🇸 670 74 5ms 24 days ago 808th Yewzir 🇧🇪 670 92 2,466ms 30 Nov 2025 809th elgan65536 🇺🇸 670 98 133ms 7 Feb 2026 810th bitsandbeyond 🇳🇱 669 119 121ms 31 Oct 2025 811th Ripick 663 76 11ms 14 Nov 2025 811th LostSyntax21 🇬🇧 663 76 12ms 30 Nov 2025 811th scpchicken 🇵🇼 663 76 12ms 5 Dec 2025 814th msbranicky 663 93 2,598ms 4 Dec 2025 815th acotis 663 99 120ms 2 Jan 2026 816th CaedenHarper 🇨🇦 662 157 1,890ms 30 Nov 2025 817th GolfingSuccess 🇬🇷 661 49 3ms 4 Nov 2025 818th Shanethegamer 🇺🇸 659 102 116ms 2 Nov 2025 819th bitsandbeyond 🇳🇱 656 75 148ms 5 Nov 2025 820th mousetail 🇳🇱 655 77 12ms 23 Nov 2025 821st madex 🇩🇪 654 74 774ms 12 days ago 822nd Yewzir 🇧🇪 654 116 28ms 30 Nov 2025 823rd scpchicken 🇵🇼 652 76 478ms 1 Jan 2026 824th AutumnWind75 652 119 438ms 10 Dec 2025 825th GolfingSuccess 🇬🇷 651 157 1,459ms 7 Dec 2025 826th emgordon154 650 92 7ms 23 days ago 827th AlephSquirrel 648 105 9ms 30 Nov 2025 828th madex 🇩🇪 647 129 269ms 12 days ago 829th Bmrl7 646 78 11ms 20 Dec 2025 830th tomh1012 644 77 435ms 25 days ago 831st jameswmccarty 643 96 2,542ms 8 Feb 2026 832nd scpchicken 🇵🇼 643 100 10ms 13 days ago 833rd HumanoidCPU 643 111 108ms 30 Nov 2025 834th GolfingSuccess 🇬🇷 639 72 1ms 30 Oct 2025 835th msbranicky 638 79 11ms 26 Nov 2025 835th nemoyatpeace 638 79 16ms 28 Dec 2025 835th nstearns96 🇬🇧 638 79 11ms 31 Dec 2025 835th tomh1012 638 79 10ms 25 days ago 835th Andrey2001 638 79 11ms 4 days ago 840th dokutan 638 163 1,613ms 5 Dec 2025 841st HumanoidCPU 637 111 457ms 29 Nov 2025 842nd msbranicky 637 131 303ms 4 Dec 2025 843rd Herbert00709 🇵🇱 636 78 5ms 23 days ago 844th BREMAUCY 🇫🇷 636 97 2,505ms 3 Dec 2025 845th HumanoidCPU 636 122 57ms 29 Nov 2025 846th a6166231 🇨🇳 634 70 11ms 12 Feb 2026 847th bitsandbeyond 🇳🇱 634 99 3ms 3 Jan 2026 848th D-MOVE 🇵🇭 632 71 42ms 21 days ago 849th prestosilver 🇺🇸 632 97 2ms 3 Dec 2025 850th scpchicken 🇵🇼 632 132 267ms 13 days ago 851st madex 🇩🇪 631 102 10ms 12 days ago 852nd aksyristos 631 123 60ms 3 Dec 2025 852nd yeminghan2021 631 123 63ms 3 Feb 2026 854th stackofbears 630 62 34ms 22 Dec 2025 855th dokutan 630 95 7ms 25 Feb 2026 856th msbranicky 630 108 8ms 4 Dec 2025 857th jameswmccarty 628 77 716ms 8 Feb 2026 858th msbranicky 628 79 457ms 3 Dec 2025 858th madex 🇩🇪 628 79 447ms 12 days ago 858th Andrey2001 628 79 461ms 4 days ago 861st rucin93 🇵🇱 627 64 54ms 30 Oct 2025 862nd HumanoidCPU 626 105 114ms 29 Nov 2025 863rd alexsave 625 71 10ms 30 Nov 2025 864th Waffle3z 622 87 2ms 26 Dec 2025 864th Andriamanitra 🇫🇮 622 87 2ms 25 days ago 866th HumanoidCPU 621 85 91ms 29 Nov 2025 867th tomh1012 620 78 779ms 25 days ago 868th IISResetMe 619 78 343ms 30 Nov 2025 869th MeWhenI 🇻🇦 618 76 5ms 23 Nov 2025 870th HumanoidCPU 616 72 12ms 29 Nov 2025 870th olleicua 🇺🇸 616 72 10ms 8 Dec 2025 872nd JOrE20 614 102 43ms 28 Nov 2025 873rd MeWhenI 🇻🇦 613 104 1,025ms 23 Nov 2025 874th HumanoidCPU 612 121 478ms 30 Nov 2025 875th AlephSquirrel 611 79 304ms 30 Nov 2025 876th kmathis22 611 101 2,374ms 6 days ago 877th AstroOrbis 610 117 94ms 25 days ago 878th madeforlosers 608 73 10ms 9 days ago 879th RDShah 607 83 11ms 1 Dec 2025 880th MeWhenI 🇻🇦 607 100 6ms 24 Nov 2025 First Prev 801–880 of 1,477 Next Last