The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Multitap Input 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 161st denkyuu1 804 73 38ms 13 Feb 2026 162nd frankgraziano 804 322 653ms 23 Jan 2026 163rd helbling 🇨🇭 802 107 10ms 31 Jan 2026 164th 5cw 🇺🇸 800 125 17ms 6 Feb 2026 165th error256 799 88 892ms 17 Feb 2026 166th namelessiw 798 130 406ms 30 Jan 2026 167th edsrzf 🇳🇿 796 166 178ms 1 Feb 2026 168th blaztoma 🇱🇹 796 216 26ms 31 Jan 2026 169th bitsandbeyond 🇳🇱 795 108 11ms 24 Jan 2026 170th albanian-laundromat 793 181 374ms 23 Feb 2026 171st stefangimmillaro 792 157 354ms 7 Feb 2026 172nd trinityy-7 789 99 3ms 28 Jan 2026 173rd edsrzf 🇳🇿 788 90 12ms 1 Feb 2026 173rd weeble 788 90 15ms 21 Feb 2026 175th MeWhenI 🇻🇦 787 116 437ms 3 Feb 2026 176th FoxInTheClouds 787 127 16ms 30 Jan 2026 176th LostSyntax21 🇬🇧 787 127 16ms 21 Feb 2026 178th dokutan 785 313 1,029ms 1 Feb 2026 179th albanian-laundromat 783 179 6ms 27 Jan 2026 180th rucin93 🇵🇱 782 153 68ms 23 Jan 2026 181st bricknellj 781 128 15ms 21 Jan 2026 182nd stefangimmillaro 780 133 431ms 7 Feb 2026 183rd bitsandbeyond 🇳🇱 777 126 8ms 25 Jan 2026 184th stefangimmillaro 775 129 16ms 14 Jan 2026 185th Maznek 773 111 13ms 9 Feb 2026 185th Lv0Sys 🇵🇱 773 111 10ms 21 Feb 2026 187th snoozingnewt 🇨🇦 772 113 99ms 1 Feb 2026 188th snoozingnewt 🇨🇦 772 143 142ms 4 Feb 2026 189th retrohun 772 154 205ms 27 Jan 2026 190th anter69 🇭🇺 769 130 15ms 20 Jan 2026 190th rucin93 🇵🇱 769 130 15ms 20 Jan 2026 192nd duckyluuk 🇳🇱 767 119 413ms 10 Feb 2026 193rd Andrey-Plotnikov 766 112 12ms 16 Jan 2026 194th error256 765 79 1,325ms 8 Feb 2026 195th frosster 🇨🇦 764 135 3ms 8 Feb 2026 196th emgordon154 763 77 41ms 7 Feb 2026 197th SirBogman 🇺🇸 763 131 17ms 26 Jan 2026 197th ndren 763 131 15ms 27 Jan 2026 199th ethanlally 763 163 373ms 30 Jan 2026 200th ovs-code 🇩🇪 758 103 3ms 22 Feb 2026 201st frankgraziano 758 154 8ms 24 Feb 2026 202nd cros107 🇦🇺 757 132 16ms 4 Feb 2026 202nd StefanHabel 🇨🇦 757 132 15ms 5 days ago 204th stefangimmillaro 756 80 1,290ms 15 Jan 2026 205th plcc0 752 133 15ms 30 Jan 2026 205th Lv0Sys 🇵🇱 752 133 16ms 21 Feb 2026 207th Natanaelel 🇸🇪 749 62 3ms 2 Feb 2026 208th Yax42 🇫🇷 746 139 476ms 12 Jan 2026 209th emgordon154 741 150 65ms 8 Feb 2026 210th JOrE20 740 116 10ms 31 Jan 2026 211th blaztoma 🇱🇹 738 63 3ms 1 Feb 2026 212th bac0id 736 151 464ms 31 Jan 2026 213th KatieLG 🇬🇧 735 136 16ms 31 Jan 2026 214th albanian-laundromat 730 355 20ms 23 Feb 2026 215th emgordon154 724 98 11ms 22 Feb 2026 216th dokutan 723 194 6ms 26 Jan 2026 217th blaztoma 🇱🇹 721 153 107ms 31 Jan 2026 218th D-MOVE 🇵🇭 720 84 1,292ms 28 Jan 2026 219th anter69 🇭🇺 716 82 38ms 26 Jan 2026 220th retrohun 714 119 6ms 13 days ago 221st madex 🇩🇪 714 140 16ms 31 Jan 2026 222nd netfri25 🇮🇱 709 167 173ms 17 Feb 2026 223rd bitsandbeyond 🇳🇱 708 157 80ms 26 Jan 2026 223rd tailorspy 708 157 453ms 13 days ago 225th jkelly467 706 127 2,666ms 5 Feb 2026 226th souta-1326 704 142 15ms 19 Feb 2026 227th kg583 🇺🇸 704 190 34ms 26 Jan 2026 228th ahmetdemirag 🇨🇾 699 143 10ms 27 Jan 2026 229th Shanethegamer 🇺🇸 698 123 13ms 6 Dec 2025 230th KatieLG 🇬🇧 692 124 10ms 31 Jan 2026 231st TheSecondComing123 690 161 466ms 27 days ago 232nd albanian-laundromat 689 145 10ms 1 Feb 2026 233rd AlephSquirrel 687 125 12ms 21 Jan 2026 233rd madeforlosers 687 125 11ms 18 Feb 2026 235th bitsandbeyond 🇳🇱 686 75 4ms 24 Jan 2026 236th yeminghan2021 686 162 71ms 3 Feb 2026 237th olleicua 🇺🇸 683 86 38ms 22 Feb 2026 238th junkondo-jp 681 126 11ms 9 Feb 2026 238th smclaughlin-cf 681 126 11ms 24 Feb 2026 240th tomh1012 680 147 11ms 25 Feb 2026 First Prev 161–240 of 422 Next Last