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 240th smclaughlin-cf 681 126 11ms 24 Feb 2026 242nd tomh1012 680 147 11ms 25 Feb 2026 243rd sean-niemann 🇺🇸 679 115 3ms 1 Feb 2026 244th tomh1012 678 153 431ms 13 Jan 2026 245th KatieLG 🇬🇧 675 87 38ms 1 Feb 2026 246th ZakkkkAttackkkk 🇵🇭 675 148 19ms 4 Feb 2026 247th dokutan 675 153 3ms 26 Jan 2026 248th zakariamouhid 671 128 11ms 20 Feb 2026 249th KatieLG 🇬🇧 671 136 503ms 1 Feb 2026 250th KasperKivimaeki 🇫🇮 662 151 16ms 14 Jan 2026 251st jatloe 658 152 10ms 6 Feb 2026 252nd FortuiteMan 🇫🇷 658 158 21ms 22 days ago 253rd TheSecondComing123 653 153 10ms 27 Feb 2026 254th evnu 652 153 94ms 9 Feb 2026 255th TheSecondComing123 651 79 4ms 27 Feb 2026 256th voytxt 🇨🇿 650 318 1,428ms 30 Jan 2026 257th bitsandbeyond 🇳🇱 649 154 16ms 24 Jan 2026 257th andrewjc2000 649 154 11ms 27 Jan 2026 259th bitsandbeyond 🇳🇱 645 91 38ms 24 Jan 2026 260th emgordon154 645 121 3ms 8 Feb 2026 261st qpwoeirut 641 156 11ms 29 Jan 2026 262nd kmathis22 641 194 385ms 2 Feb 2026 263rd CaedenHarper 🇨🇦 636 135 11ms 4 Feb 2026 264th elgan65536 🇺🇸 635 208 159ms 14 Feb 2026 265th netfri25 🇮🇱 629 159 11ms 23 Feb 2026 265th dokutan 629 159 16ms 16 days ago 267th madex 🇩🇪 629 210 164ms 31 Jan 2026 268th albanian-laundromat 628 329 1,442ms 19 days ago 269th Shanethegamer 🇺🇸 623 168 10ms 6 Dec 2025 270th FortuiteMan 🇫🇷 613 163 16ms 1 Feb 2026 271st stefangimmillaro 610 147 2,805ms 1 Feb 2026 272nd JOrE20 610 282 26ms 12 Feb 2026 273rd alexsave 609 141 10ms 27 Feb 2026 274th Shanethegamer 🇺🇸 604 135 143ms 6 Dec 2025 275th CaedenHarper 🇨🇦 603 238 321ms 9 Feb 2026 276th YAJUE114514 602 166 12ms 23 days ago 277th bac0id 601 130 3ms 31 Jan 2026 278th Protothor 600 143 10ms 22 Feb 2026 279th dokutan 597 153 411ms 16 days ago 280th madex 🇩🇪 591 132 3ms 31 Jan 2026 281st bpharaldsson 591 169 11ms 16 Feb 2026 282nd scpchicken 🇵🇼 585 171 11ms 27 Jan 2026 282nd CaedenHarper 🇨🇦 585 171 12ms 4 Feb 2026 284th Emutis 🇱🇹 581 172 11ms 4 Feb 2026 285th CaedenHarper 🇨🇦 581 214 394ms 9 Feb 2026 286th bitsandbeyond 🇳🇱 578 135 3ms 26 Jan 2026 287th jameswmccarty 578 173 11ms 27 Jan 2026 288th Lv0Sys 🇵🇱 576 102 40ms 21 Feb 2026 289th Shanethegamer 🇺🇸 575 174 32ms 7 Dec 2025 289th elgan65536 🇺🇸 575 174 20ms 14 Feb 2026 291st madex 🇩🇪 567 253 278ms 31 Jan 2026 292nd h3ra993huskp 🇯🇵 565 220 357ms 1 Feb 2026 293rd Waffle3z 564 183 3ms 27 Feb 2026 294th CaedenHarper 🇨🇦 563 162 486ms 4 Feb 2026 295th Natanaelel 🇸🇪 560 133 416ms 26 Jan 2026 296th LostSyntax21 🇬🇧 560 349 9ms 21 Feb 2026 297th Shanethegamer 🇺🇸 559 128 421ms 6 Dec 2025 298th prestosilver 🇺🇸 558 140 3ms 2 Feb 2026 299th Shanethegamer 🇺🇸 553 165 496ms 7 Dec 2025 300th Program-Pi 550 156 12ms 21 days ago 301st UnderKoen 🇳🇱 549 287 7ms 3 days ago 302nd weliveinhell 🇭🇹 547 157 10ms 14 Feb 2026 303rd JRaspass 🇬🇧 536 96 3ms 1 Feb 2026 304th Heathcorp 🇦🇺 535 146 2ms 10 Feb 2026 305th nemoyatpeace 535 187 13ms 7 Feb 2026 306th te-chnical 532 188 18ms 6 Feb 2026 307th AstroOrbis 529 189 12ms 10 Feb 2026 308th Chinay-Domitrix 🇺🇸 528 170 2,758ms 26 days ago 309th dokutan 528 355 104ms 8 days ago 310th CaedenHarper 🇨🇦 527 197 448ms 9 Feb 2026 311th Heathcorp 🇦🇺 526 190 14ms 8 Feb 2026 312th Shanethegamer 🇺🇸 524 112 42ms 6 Dec 2025 313th qrakhen 524 198 416ms 26 Feb 2026 314th jared-hughes 523 164 10ms 9 Feb 2026 315th IISResetMe 522 115 373ms 28 Feb 2026 316th retrohun 521 143 4ms 31 Jan 2026 317th MeWhenI 🇻🇦 517 144 23ms 21 Dec 2025 318th amazingalek 🇳🇴 511 203 409ms 26 Jan 2026 319th dokutan 504 184 3ms 26 Jan 2026 320th bpharaldsson 496 209 434ms 17 Feb 2026 First Prev 241–320 of 424 Next Last