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 481st fuzzylojik-golf 🇺🇸 855 50 3ms 8 Jan 2026 482nd snoozingnewt 🇨🇦 855 58 412ms 26 days ago 482nd primo-ppcg 🇹🇭 855 58 6ms 24 days ago 482nd Seek64 🇩🇪 855 58 5ms 24 days ago 485th MeWhenI 🇻🇦 855 70 112ms 23 Nov 2025 486th Shanethegamer 🇺🇸 855 73 391ms 4 Nov 2025 486th MeWhenI 🇻🇦 855 73 453ms 21 Nov 2025 486th CaedenHarper 🇨🇦 855 73 381ms 29 Nov 2025 489th bitsandbeyond 🇳🇱 854 52 145ms 1 Nov 2025 490th davecame 854 59 12ms 13 Nov 2025 490th Kacarott 🇦🇺 854 59 12ms 15 Nov 2025 490th commandz0 🇺🇸 854 59 12ms 28 Nov 2025 490th dokutan 854 59 11ms 28 Nov 2025 490th vhoulbreque 🇫🇷 854 59 12ms 30 Nov 2025 490th YAJUE114514 854 59 12ms 10 Dec 2025 490th enigma 854 59 11ms 20 Dec 2025 490th andrewjc2000 854 59 11ms 7 Jan 2026 490th TheSecondComing123 854 59 12ms 4 Feb 2026 499th Shanethegamer 🇺🇸 853 52 10ms 4 Nov 2025 499th MeWhenI 🇻🇦 853 52 11ms 21 Nov 2025 499th CaedenHarper 🇨🇦 853 52 11ms 29 Nov 2025 502nd Shanethegamer 🇺🇸 852 66 1,303ms 3 Nov 2025 503rd h3ra993huskp 🇯🇵 852 83 447ms 14 Dec 2025 504th MeWhenI 🇻🇦 852 89 27ms 24 Nov 2025 505th dokutan 851 72 2ms 5 days ago 506th Natanaelel 🇸🇪 849 46 33ms 8 Nov 2025 507th emgordon154 849 57 926ms 21 Dec 2025 508th Natanaelel 🇸🇪 847 53 36ms 4 Nov 2025 509th ovs-code 🇩🇪 847 76 14ms 3 Nov 2025 510th edsrzf 🇳🇿 847 94 108ms 1 Dec 2025 511th dokutan 844 92 64ms 24 Nov 2025 512th arcpolaris 843 74 399ms 3 Dec 2025 513th Shanethegamer 🇺🇸 843 91 8ms 3 Nov 2025 513th MeWhenI 🇻🇦 843 91 8ms 23 Nov 2025 515th dokutan 842 78 119ms 1 Dec 2025 516th bitsandbeyond 🇳🇱 842 90 27ms 2 Nov 2025 517th ethanlally 841 84 574ms 23 Nov 2025 517th dokutan 841 84 492ms 28 Nov 2025 517th jkelly467 841 84 469ms 2 Dec 2025 520th MeWhenI 🇻🇦 840 54 1,213ms 23 Nov 2025 520th emgordon154 840 54 1,250ms 20 Dec 2025 522nd dokutan 840 59 404ms 28 Nov 2025 522nd KasperKivimaeki 🇫🇮 840 59 5ms 24 days ago 522nd namelessiw 840 59 5ms 24 days ago 522nd Lv0Sys 🇵🇱 840 59 5ms 20 days ago 526th taifu 840 60 12ms 20 Dec 2025 526th jatloe 840 60 11ms 20 Jan 2026 528th sean-niemann 🇺🇸 840 67 1,246ms 2 Dec 2025 529th Shanethegamer 🇺🇸 840 68 3ms 4 Nov 2025 529th MeWhenI 🇻🇦 840 68 3ms 23 Nov 2025 529th DialFrost 🇸🇬 840 68 3ms 3 Dec 2025 532nd madex 🇩🇪 840 73 2ms 11 days ago 533rd edsrzf 🇳🇿 840 80 123ms 6 days ago 534th error256 840 81 11ms 24 days ago 535th rucin93 🇵🇱 839 56 5ms 30 Oct 2025 535th DialFrost 🇸🇬 839 56 57ms 29 Dec 2025 537th albanian-laundromat 839 85 83ms 16 Dec 2025 538th edsrzf 🇳🇿 838 76 4ms 6 days ago 539th GolfingSuccess 🇬🇷 838 95 111ms 28 Nov 2025 539th DialFrost 🇸🇬 838 95 103ms 3 Dec 2025 539th sean-niemann 🇺🇸 838 95 117ms 4 Jan 2026 542nd snoozingnewt 🇨🇦 837 53 11ms 28 Nov 2025 542nd Yax42 🇫🇷 837 53 10ms 2 Dec 2025 544th CaedenHarper 🇨🇦 836 75 39ms 30 Nov 2025 545th jkelly467 835 102 2ms 2 Dec 2025 546th DialFrost 🇸🇬 834 59 149ms 2 Dec 2025 547th kg583 🇺🇸 834 92 9ms 30 Oct 2025 548th MeWhenI 🇻🇦 834 100 295ms 23 Nov 2025 549th plcc0 833 91 27ms 22 days ago 550th NickTheEASDude 🇺🇸 832 65 2ms 21 days ago 551st bitsandbeyond 🇳🇱 832 89 470ms 2 Nov 2025 552nd Shanethegamer 🇺🇸 831 54 32ms 3 Nov 2025 552nd blaztoma 🇱🇹 831 54 34ms 30 Nov 2025 552nd fuzzylojik-golf 🇺🇸 831 54 35ms 18 days ago 555th GolfingSuccess 🇬🇷 831 84 39ms 3 Nov 2025 556th Natanaelel 🇸🇪 829 81 120ms 27 Nov 2025 557th blaztoma 🇱🇹 829 96 132ms 30 Nov 2025 558th fuzzylojik-golf 🇺🇸 827 59 2ms 15 days ago 559th fuzzylojik-golf 🇺🇸 827 68 1,237ms 14 days ago 560th albanian-laundromat 827 220 12ms 5 Dec 2025 First Prev 481–560 of 1,477 Next Last