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?
Multitap Input in all languages in chars. 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 Chars Time Submitted 81st nwellnhof 🇩🇪 853 86 358ms 26 Jan 2026 82nd albanian-laundromat 852 145 42ms 26 Feb 2026 83rd edsrzf 🇳🇿 852 167 289ms 28 Jan 2026 84th edsrzf 🇳🇿 851 111 190ms 1 Feb 2026 85th emgordon154 851 128 428ms 14 Feb 2026 85th Lv0Sys 🇵🇱 851 128 431ms 26 days ago 87th error256 850 113 65ms 9 Feb 2026 88th GrayJoKing 🇦🇺 850 136 8ms 25 days ago 89th Natanaelel 🇸🇪 850 138 139ms 22 Jan 2026 90th sean-niemann 🇺🇸 849 114 8ms 15 Jan 2026 91st IanUtley 846 119 17ms 10 Feb 2026 92nd edsrzf 🇳🇿 846 129 107ms 19 Jan 2026 93rd frankgraziano 846 139 991ms 18 Feb 2026 94th edsrzf 🇳🇿 846 140 4ms 25 days ago 95th kumavale 846 155 176ms 24 Jan 2026 96th kg583 🇺🇸 845 142 10ms 23 Feb 2026 97th kg583 🇺🇸 841 82 394ms 20 Jan 2026 97th sean-niemann 🇺🇸 841 82 453ms 25 Jan 2026 97th CornerMercury 🇬🇧 841 82 397ms 29 Jan 2026 100th kg583 🇺🇸 841 101 16ms 2 Feb 2026 101st blaztoma 🇱🇹 841 147 40ms 31 Jan 2026 102nd emgordon154 841 186 11ms 7 Feb 2026 103rd edsrzf 🇳🇿 840 156 1,359ms 3 Feb 2026 104th edsrzf 🇳🇿 839 143 21ms 3 Feb 2026 105th edsrzf 🇳🇿 839 159 31ms 11 Feb 2026 106th error256 839 245 1,450ms 9 Feb 2026 107th edsrzf 🇳🇿 838 133 123ms 26 Jan 2026 108th edsrzf 🇳🇿 837 166 3ms 27 Jan 2026 109th albanian-laundromat 837 204 25ms 3 Feb 2026 110th canissimia 🇦🇶 836 137 3ms 11 Feb 2026 111th stefangimmillaro 834 142 222ms 2 Feb 2026 112th edsrzf 🇳🇿 833 67 143ms 29 Jan 2026 113th edsrzf 🇳🇿 832 141 140ms 5 Feb 2026 114th snoozingnewt 🇨🇦 831 83 340ms 4 Feb 2026 114th emgordon154 831 83 440ms 7 Feb 2026 116th anter69 🇭🇺 830 90 16ms 20 Jan 2026 117th nwellnhof 🇩🇪 829 69 333ms 26 Jan 2026 118th FortuiteMan 🇫🇷 829 156 21ms 20 days ago 119th targrik 827 117 11ms 11 Dec 2025 120th edsrzf 🇳🇿 827 160 101ms 29 Jan 2026 121st JOrE20 826 101 10ms 31 Jan 2026 122nd albanian-laundromat 825 166 44ms 8 days ago 123rd ovs-code 🇩🇪 824 65 43ms 6 Dec 2025 124th kg583 🇺🇸 824 226 71ms 7 days ago 125th snoozingnewt 🇨🇦 822 89 97ms 1 Feb 2026 126th ndren 821 91 15ms 27 Jan 2026 127th emgordon154 819 251 1,625ms 7 Feb 2026 128th sean-niemann 🇺🇸 815 85 774ms 27 Jan 2026 129th sean-niemann 🇺🇸 815 135 468ms 1 Feb 2026 130th albanian-laundromat 813 150 4ms 11 Feb 2026 131st emgordon154 813 220 1,615ms 8 Feb 2026 132nd anter69 🇭🇺 812 66 67ms 26 Jan 2026 133rd plcc0 812 92 16ms 30 Jan 2026 134th Natanaelel 🇸🇪 810 103 13ms 29 Jan 2026 135th albanian-laundromat 809 240 139ms 33 mins ago 136th emgordon154 803 74 1,213ms 7 Feb 2026 137th KatieLG 🇬🇧 803 93 16ms 27 days ago 138th duckyluuk 🇳🇱 802 104 12ms 10 Feb 2026 139th duckyluuk 🇳🇱 802 125 18ms 11 Feb 2026 140th nwellnhof 🇩🇪 800 67 42ms 26 Jan 2026 141st frankgraziano 800 322 653ms 23 Jan 2026 142nd MeWhenI 🇻🇦 794 105 10ms 44 hours ago 143rd blaztoma 🇱🇹 791 216 26ms 31 Jan 2026 144th edsrzf 🇳🇿 790 166 180ms 1 Feb 2026 145th stefangimmillaro 788 68 37ms 15 Jan 2026 146th error256 787 88 892ms 17 Feb 2026 147th albanian-laundromat 787 181 374ms 23 Feb 2026 148th stefangimmillaro 786 157 354ms 7 Feb 2026 149th albanian-laundromat 785 177 11ms 17 days ago 150th namelessiw 784 130 406ms 30 Jan 2026 151st trinityy-7 780 99 3ms 28 Jan 2026 152nd dokutan 780 313 1,029ms 1 Feb 2026 153rd helbling 🇨🇭 779 107 10ms 31 Jan 2026 154th error256 777 69 42ms 8 Feb 2026 155th edsrzf 🇳🇿 776 90 12ms 1 Feb 2026 155th weeble 776 90 15ms 21 Feb 2026 157th rucin93 🇵🇱 774 153 68ms 23 Jan 2026 158th bitsandbeyond 🇳🇱 772 108 11ms 24 Jan 2026 159th bitsandbeyond 🇳🇱 768 126 8ms 25 Jan 2026 160th stefangimmillaro 767 133 431ms 7 Feb 2026 First Prev 81–160 of 421 Next Last