The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 36 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 481st bitsandbeyond 🇳🇱 856 53 1,275ms 1 Nov 2025 482nd DialFrost 🇸🇬 856 57 2ms 19 Dec 2025 483rd fuzzylojik-golf 🇺🇸 855 50 3ms 8 Jan 2026 484th snoozingnewt 🇨🇦 855 58 412ms 28 Feb 2026 484th primo-ppcg 🇹🇭 855 58 6ms 2 Mar 2026 484th Seek64 🇩🇪 855 58 5ms 27 days ago 487th MeWhenI 🇻🇦 855 70 112ms 23 Nov 2025 488th Shanethegamer 🇺🇸 855 73 391ms 4 Nov 2025 488th MeWhenI 🇻🇦 855 73 453ms 21 Nov 2025 488th CaedenHarper 🇨🇦 855 73 381ms 29 Nov 2025 491st bitsandbeyond 🇳🇱 854 52 145ms 1 Nov 2025 492nd davecame 854 59 12ms 13 Nov 2025 492nd Kacarott 🇦🇺 854 59 12ms 15 Nov 2025 492nd commandz0 🇺🇸 854 59 12ms 28 Nov 2025 492nd dokutan 854 59 11ms 28 Nov 2025 492nd vhoulbreque 🇫🇷 854 59 12ms 30 Nov 2025 492nd YAJUE114514 854 59 12ms 10 Dec 2025 492nd enigma 854 59 11ms 20 Dec 2025 492nd andrewjc2000 854 59 11ms 7 Jan 2026 492nd TheSecondComing123 854 59 12ms 4 Feb 2026 501st Shanethegamer 🇺🇸 853 52 10ms 4 Nov 2025 501st MeWhenI 🇻🇦 853 52 11ms 21 Nov 2025 501st CaedenHarper 🇨🇦 853 52 11ms 29 Nov 2025 504th Shanethegamer 🇺🇸 852 66 1,303ms 3 Nov 2025 505th h3ra993huskp 🇯🇵 852 83 447ms 14 Dec 2025 506th MeWhenI 🇻🇦 852 89 27ms 24 Nov 2025 507th dokutan 851 72 2ms 8 days ago 508th Natanaelel 🇸🇪 849 46 33ms 8 Nov 2025 509th emgordon154 849 57 926ms 21 Dec 2025 510th Natanaelel 🇸🇪 847 53 36ms 4 Nov 2025 511th ovs-code 🇩🇪 847 76 14ms 3 Nov 2025 512th edsrzf 🇳🇿 847 94 108ms 1 Dec 2025 513th dokutan 844 92 64ms 24 Nov 2025 514th arcpolaris 843 74 399ms 3 Dec 2025 515th Shanethegamer 🇺🇸 843 91 8ms 3 Nov 2025 515th MeWhenI 🇻🇦 843 91 8ms 23 Nov 2025 517th dokutan 842 78 130ms 1 Dec 2025 518th bitsandbeyond 🇳🇱 842 90 27ms 2 Nov 2025 519th ethanlally 841 84 574ms 23 Nov 2025 519th dokutan 841 84 492ms 28 Nov 2025 519th jkelly467 841 84 469ms 2 Dec 2025 522nd MeWhenI 🇻🇦 840 54 1,213ms 23 Nov 2025 522nd emgordon154 840 54 1,250ms 20 Dec 2025 524th dokutan 840 59 404ms 28 Nov 2025 524th KasperKivimaeki 🇫🇮 840 59 5ms 2 Mar 2026 524th namelessiw 840 59 5ms 2 Mar 2026 524th Lv0Sys 🇵🇱 840 59 5ms 23 days ago 528th taifu 840 60 12ms 20 Dec 2025 528th jatloe 840 60 11ms 20 Jan 2026 530th sean-niemann 🇺🇸 840 67 1,246ms 2 Dec 2025 531st Shanethegamer 🇺🇸 840 68 3ms 4 Nov 2025 531st MeWhenI 🇻🇦 840 68 3ms 23 Nov 2025 531st DialFrost 🇸🇬 840 68 3ms 3 Dec 2025 534th madex 🇩🇪 840 73 2ms 14 days ago 535th edsrzf 🇳🇿 840 80 123ms 9 days ago 536th error256 840 81 11ms 27 days ago 537th rucin93 🇵🇱 839 56 5ms 30 Oct 2025 537th DialFrost 🇸🇬 839 56 57ms 29 Dec 2025 539th albanian-laundromat 839 85 83ms 16 Dec 2025 540th edsrzf 🇳🇿 838 76 4ms 9 days ago 541st GolfingSuccess 🇬🇷 838 95 111ms 28 Nov 2025 541st DialFrost 🇸🇬 838 95 103ms 3 Dec 2025 541st sean-niemann 🇺🇸 838 95 117ms 4 Jan 2026 544th snoozingnewt 🇨🇦 837 53 11ms 28 Nov 2025 544th Yax42 🇫🇷 837 53 10ms 2 Dec 2025 546th CaedenHarper 🇨🇦 836 75 39ms 30 Nov 2025 547th jkelly467 835 102 2ms 2 Dec 2025 548th DialFrost 🇸🇬 834 59 149ms 2 Dec 2025 549th kg583 🇺🇸 834 92 9ms 30 Oct 2025 550th MeWhenI 🇻🇦 834 100 295ms 23 Nov 2025 551st plcc0 833 91 27ms 26 days ago 552nd NickTheEASDude 🇺🇸 832 65 2ms 25 days ago 553rd bitsandbeyond 🇳🇱 832 89 470ms 2 Nov 2025 554th Shanethegamer 🇺🇸 831 54 32ms 3 Nov 2025 554th blaztoma 🇱🇹 831 54 34ms 30 Nov 2025 554th fuzzylojik-golf 🇺🇸 831 54 35ms 22 days ago 557th GolfingSuccess 🇬🇷 831 84 39ms 3 Nov 2025 558th Natanaelel 🇸🇪 829 81 120ms 27 Nov 2025 559th blaztoma 🇱🇹 829 96 132ms 30 Nov 2025 560th fuzzylojik-golf 🇺🇸 827 59 2ms 18 days ago First Prev 481–560 of 1,480 Next Last