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?
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 78th davecame 869 115 15ms 2 Feb 2026 82nd emgordon154 868 94 146ms 7 Feb 2026 83rd albanian-laundromat 868 117 16ms 10 days ago 84th KasperKivimaeki 🇫🇮 867 90 3ms 12 days ago 85th edsrzf 🇳🇿 867 107 352ms 29 Jan 2026 86th nwellnhof 🇩🇪 866 86 358ms 26 Jan 2026 87th blaztoma 🇱🇹 866 113 8ms 31 Jan 2026 88th MeWhenI 🇻🇦 866 120 25ms 11 hours ago 89th edsrzf 🇳🇿 865 135 9ms 26 Feb 2026 90th stefangimmillaro 864 68 37ms 15 Jan 2026 90th sean-niemann 🇺🇸 864 68 39ms 3 Feb 2026 90th Steffan153 🇫🇮 864 68 42ms 11 Feb 2026 93rd edsrzf 🇳🇿 863 111 190ms 1 Feb 2026 94th error256 862 113 65ms 9 Feb 2026 95th kg583 🇺🇸 862 116 17ms 6 Dec 2025 95th ryyyn 🇺🇸 862 116 17ms 26 Jan 2026 95th AlephSquirrel 862 116 31ms 29 Jan 2026 95th snoozingnewt 🇨🇦 862 116 15ms 4 Feb 2026 99th emgordon154 861 128 428ms 14 Feb 2026 99th Lv0Sys 🇵🇱 861 128 431ms 27 days ago 101st albanian-laundromat 861 145 42ms 26 Feb 2026 102nd sean-niemann 🇺🇸 859 114 8ms 15 Jan 2026 103rd GrayJoKing 🇦🇺 859 136 8ms 26 days ago 104th edsrzf 🇳🇿 859 167 289ms 28 Jan 2026 105th Natanaelel 🇸🇪 858 138 139ms 22 Jan 2026 106th IanUtley 857 119 17ms 10 Feb 2026 107th frankgraziano 856 139 991ms 18 Feb 2026 108th edsrzf 🇳🇿 855 129 107ms 19 Jan 2026 109th edsrzf 🇳🇿 855 140 4ms 25 days ago 110th MeWhenI 🇻🇦 854 117 39ms 3 Feb 2026 111th kg583 🇺🇸 854 142 10ms 23 Feb 2026 112th sean-niemann 🇺🇸 853 107 461ms 25 Jan 2026 112th CornerMercury 🇬🇧 853 107 403ms 29 Jan 2026 112th Steffan153 🇫🇮 853 107 413ms 26 Feb 2026 115th kumavale 853 155 176ms 24 Jan 2026 116th error256 851 69 42ms 8 Feb 2026 117th edsrzf 🇳🇿 850 67 143ms 29 Jan 2026 118th kg583 🇺🇸 849 114 5ms 15 Feb 2026 119th blaztoma 🇱🇹 849 147 40ms 31 Jan 2026 120th edsrzf 🇳🇿 848 133 123ms 26 Jan 2026 121st edsrzf 🇳🇿 848 143 21ms 3 Feb 2026 122nd edsrzf 🇳🇿 848 156 1,359ms 3 Feb 2026 123rd emgordon154 847 118 16ms 7 Feb 2026 124th edsrzf 🇳🇿 847 159 31ms 11 Feb 2026 125th emgordon154 847 186 11ms 7 Feb 2026 126th canissimia 🇦🇶 846 137 3ms 11 Feb 2026 127th edsrzf 🇳🇿 845 166 3ms 27 Jan 2026 128th stefangimmillaro 844 142 222ms 2 Feb 2026 129th albanian-laundromat 843 204 25ms 3 Feb 2026 130th error256 843 245 1,450ms 9 Feb 2026 131st voytxt 🇨🇿 841 102 12ms 26 Jan 2026 131st emgordon154 841 102 11ms 2 Feb 2026 133rd edsrzf 🇳🇿 840 141 140ms 5 Feb 2026 134th emgordon154 837 109 521ms 7 Feb 2026 135th targrik 837 117 11ms 11 Dec 2025 136th edsrzf 🇳🇿 836 160 101ms 29 Jan 2026 137th albanian-laundromat 834 166 44ms 9 days ago 138th trinityy-7 833 103 11ms 26 Jan 2026 138th Natanaelel 🇸🇪 833 103 13ms 29 Jan 2026 140th kg583 🇺🇸 830 226 71ms 8 days ago 141st MeWhenI 🇻🇦 827 71 37ms 6 Dec 2025 142nd sean-niemann 🇺🇸 827 85 774ms 27 Jan 2026 143rd duckyluuk 🇳🇱 826 121 15ms 5 Feb 2026 144th duckyluuk 🇳🇱 825 104 12ms 10 Feb 2026 145th sean-niemann 🇺🇸 823 135 468ms 1 Feb 2026 146th albanian-laundromat 823 150 4ms 11 Feb 2026 147th emgordon154 823 251 1,625ms 7 Feb 2026 148th snoozingnewt 🇨🇦 822 111 416ms 4 Feb 2026 149th commandz0 🇺🇸 819 122 16ms 6 Dec 2025 149th Flekay 🇩🇪 819 122 16ms 16 Feb 2026 151st emgordon154 819 220 1,615ms 8 Feb 2026 152nd emgordon154 817 74 1,213ms 7 Feb 2026 153rd MeWhenI 🇻🇦 817 105 10ms 2 days ago 154th albanian-laundromat 815 240 139ms 22 hours ago 155th bzijlema 🇳🇱 813 123 16ms 16 Feb 2026 156th duckyluuk 🇳🇱 813 125 18ms 11 Feb 2026 157th kg583 🇺🇸 811 129 17ms 19 Jan 2026 158th AlephSquirrel 808 113 414ms 21 Jan 2026 158th GolfingSuccess 🇬🇷 808 113 452ms 21 Jan 2026 160th GolfingSuccess 🇬🇷 806 124 16ms 21 Jan 2026 First Prev 81–160 of 424 Next Last