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 161st snoozingnewt 🇨🇦 764 143 142ms 4 Feb 2026 162nd retrohun 764 154 205ms 27 Jan 2026 163rd albanian-laundromat 762 98 11ms 23 days ago 164th ethanlally 757 163 373ms 30 Jan 2026 165th frosster 🇨🇦 756 135 3ms 8 Feb 2026 166th MeWhenI 🇻🇦 755 71 37ms 6 Dec 2025 167th error256 752 79 1,325ms 8 Feb 2026 168th Maznek 751 111 13ms 9 Feb 2026 168th Lv0Sys 🇵🇱 751 111 10ms 21 Feb 2026 170th frankgraziano 751 154 8ms 24 Feb 2026 171st ovs-code 🇩🇪 749 103 3ms 22 Feb 2026 172nd ovs-code 🇩🇪 747 98 101ms 19 days ago 173rd Andrey-Plotnikov 745 112 12ms 16 Jan 2026 174th stefangimmillaro 742 80 1,290ms 15 Jan 2026 175th KatieLG 🇬🇧 741 93 359ms 27 days ago 176th rucin93 🇵🇱 740 90 146ms 28 Jan 2026 177th dokutan 737 124 3ms 26 Jan 2026 178th denkyuu1 734 73 38ms 13 Feb 2026 179th Yax42 🇫🇷 734 139 476ms 12 Jan 2026 180th emgordon154 734 150 65ms 8 Feb 2026 181st Natanaelel 🇸🇪 732 62 3ms 2 Feb 2026 182nd emplv 🇱🇻 732 91 153ms 28 Jan 2026 183rd bac0id 729 151 464ms 31 Jan 2026 184th albanian-laundromat 726 355 20ms 23 Feb 2026 185th blaztoma 🇱🇹 721 63 3ms 1 Feb 2026 186th dokutan 716 194 6ms 26 Jan 2026 187th blaztoma 🇱🇹 714 153 107ms 31 Jan 2026 188th emgordon154 713 98 11ms 22 Feb 2026 189th dokutan 713 143 3ms 26 Jan 2026 190th dokutan 711 105 22ms 13 days ago 191st emgordon154 708 94 146ms 7 Feb 2026 192nd error256 708 120 13ms 10 Feb 2026 193rd D-MOVE 🇵🇭 707 84 1,292ms 28 Jan 2026 194th retrohun 704 119 6ms 13 days ago 195th netfri25 🇮🇱 702 167 173ms 17 Feb 2026 196th bitsandbeyond 🇳🇱 701 157 80ms 26 Jan 2026 196th tailorspy 701 157 453ms 14 days ago 198th jkelly467 698 127 2,666ms 5 Feb 2026 199th kg583 🇺🇸 697 190 34ms 26 Jan 2026 200th emgordon154 696 77 41ms 7 Feb 2026 201st ovs-code 🇩🇪 692 108 72ms 5 Dec 2025 202nd TheSecondComing123 684 161 466ms 27 Feb 2026 203rd nwellnhof 🇩🇪 679 110 42ms 27 Jan 2026 204th yeminghan2021 679 162 71ms 3 Feb 2026 205th Shanethegamer 🇺🇸 678 123 13ms 6 Dec 2025 206th bitsandbeyond 🇳🇱 672 75 4ms 24 Jan 2026 207th KatieLG 🇬🇧 672 124 10ms 31 Jan 2026 208th sean-niemann 🇺🇸 671 115 3ms 1 Feb 2026 209th ovs-code 🇩🇪 669 103 410ms 29 Jan 2026 210th AlephSquirrel 667 125 12ms 21 Jan 2026 210th madeforlosers 667 125 11ms 18 Feb 2026 212th tomh1012 666 153 431ms 13 Jan 2026 213th dokutan 663 104 437ms 13 days ago 214th junkondo-jp 662 126 11ms 9 Feb 2026 214th smclaughlin-cf 662 126 11ms 24 Feb 2026 216th edsrzf 🇳🇿 655 114 15ms 19 Jan 2026 216th Natanaelel 🇸🇪 655 114 15ms 23 Jan 2026 218th zakariamouhid 651 128 11ms 20 Feb 2026 219th blaztoma 🇱🇹 650 115 15ms 26 Jan 2026 219th davecame 650 115 15ms 2 Feb 2026 221st voytxt 🇨🇿 646 318 1,428ms 30 Jan 2026 222nd ryyyn 🇺🇸 644 116 17ms 26 Jan 2026 222nd AlephSquirrel 644 116 31ms 29 Jan 2026 224th TheSecondComing123 638 79 4ms 27 Feb 2026 225th MeWhenI 🇻🇦 638 117 39ms 3 Feb 2026 226th emgordon154 638 121 3ms 8 Feb 2026 227th kmathis22 636 194 385ms 2 Feb 2026 228th elgan65536 🇺🇸 630 208 159ms 14 Feb 2026 229th albanian-laundromat 625 329 1,442ms 18 days ago 230th madex 🇩🇪 624 210 164ms 31 Jan 2026 231st olleicua 🇺🇸 623 86 38ms 22 Feb 2026 232nd LostSyntax21 🇬🇧 619 349 9ms 21 Feb 2026 233rd CaedenHarper 🇨🇦 618 135 11ms 4 Feb 2026 234th KatieLG 🇬🇧 616 87 38ms 1 Feb 2026 235th commandz0 🇺🇸 612 122 16ms 6 Dec 2025 235th Flekay 🇩🇪 612 122 16ms 16 Feb 2026 237th AlephSquirrel 610 113 414ms 21 Jan 2026 237th GolfingSuccess 🇬🇷 610 113 452ms 21 Jan 2026 239th bzijlema 🇳🇱 607 123 16ms 16 Feb 2026 240th JOrE20 606 282 26ms 12 Feb 2026 First Prev 161–240 of 421 Next Last