The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 241st tomh1012 678 153 431ms 13 Jan 2026 242nd KatieLG 🇬🇧 675 87 38ms 1 Feb 2026 243rd ZakkkkAttackkkk 🇵🇭 675 148 19ms 4 Feb 2026 244th dokutan 675 153 3ms 26 Jan 2026 245th KatieLG 🇬🇧 671 136 503ms 1 Feb 2026 246th zakariamouhid 670 128 17ms 20 Feb 2026 247th KasperKivimaeki 🇫🇮 662 151 16ms 14 Jan 2026 248th jatloe 658 152 10ms 6 Feb 2026 249th TheSecondComing123 653 153 10ms 25 days ago 250th evnu 652 153 94ms 9 Feb 2026 251st TheSecondComing123 651 79 4ms 25 days ago 252nd voytxt 🇨🇿 650 318 1,416ms 30 Jan 2026 253rd bitsandbeyond 🇳🇱 649 154 16ms 24 Jan 2026 253rd andrewjc2000 649 154 11ms 27 Jan 2026 255th bitsandbeyond 🇳🇱 645 91 38ms 24 Jan 2026 256th emgordon154 645 121 3ms 8 Feb 2026 257th qpwoeirut 641 156 11ms 29 Jan 2026 258th kmathis22 641 194 385ms 2 Feb 2026 259th CaedenHarper 🇨🇦 635 135 12ms 4 Feb 2026 260th elgan65536 🇺🇸 635 208 154ms 14 Feb 2026 261st LostSyntax21 🇬🇧 634 349 9ms 21 Feb 2026 262nd netfri25 🇮🇱 629 159 11ms 23 Feb 2026 262nd dokutan 629 159 16ms 11 days ago 264th madex 🇩🇪 629 210 153ms 31 Jan 2026 265th albanian-laundromat 628 329 1,427ms 15 days ago 266th solisolu 625 160 11ms 18 Feb 2026 267th Shanethegamer 🇺🇸 623 168 10ms 6 Dec 2025 268th FortuiteMan 🇫🇷 613 163 16ms 1 Feb 2026 269th stefangimmillaro 610 147 2,805ms 1 Feb 2026 270th JOrE20 610 282 26ms 12 Feb 2026 271st alexsave 608 141 13ms 25 days ago 272nd Shanethegamer 🇺🇸 604 135 143ms 6 Dec 2025 273rd CaedenHarper 🇨🇦 603 238 321ms 9 Feb 2026 274th YAJUE114514 602 166 12ms 19 days ago 275th bac0id 601 130 3ms 31 Jan 2026 276th Protothor 600 143 32ms 22 Feb 2026 277th dokutan 597 153 411ms 11 days ago 278th madex 🇩🇪 591 132 3ms 31 Jan 2026 279th bpharaldsson 591 169 11ms 16 Feb 2026 280th scpchicken 🇵🇼 585 171 11ms 27 Jan 2026 280th CaedenHarper 🇨🇦 585 171 12ms 4 Feb 2026 282nd Emutis 🇱🇹 581 172 11ms 4 Feb 2026 283rd CaedenHarper 🇨🇦 581 214 394ms 9 Feb 2026 284th bitsandbeyond 🇳🇱 578 135 3ms 26 Jan 2026 285th jameswmccarty 578 173 11ms 27 Jan 2026 286th Lv0Sys 🇵🇱 576 102 40ms 21 Feb 2026 287th Shanethegamer 🇺🇸 575 174 32ms 7 Dec 2025 287th elgan65536 🇺🇸 575 174 20ms 14 Feb 2026 289th madex 🇩🇪 567 253 278ms 31 Jan 2026 290th h3ra993huskp 🇯🇵 565 220 357ms 1 Feb 2026 291st Waffle3z 564 183 3ms 24 days ago 292nd CaedenHarper 🇨🇦 563 162 486ms 4 Feb 2026 293rd Natanaelel 🇸🇪 560 133 416ms 26 Jan 2026 294th Shanethegamer 🇺🇸 559 128 421ms 6 Dec 2025 295th prestosilver 🇺🇸 558 140 3ms 2 Feb 2026 296th Shanethegamer 🇺🇸 553 165 496ms 7 Dec 2025 297th Program-Pi 550 156 12ms 16 days ago 298th UnderKoen 🇳🇱 547 288 6ms 4 Feb 2026 299th weliveinhell 🇭🇹 546 157 16ms 14 Feb 2026 300th JRaspass 🇬🇧 536 96 3ms 1 Feb 2026 301st Heathcorp 🇦🇺 535 146 2ms 10 Feb 2026 302nd nemoyatpeace 535 187 13ms 7 Feb 2026 303rd te-chnical 532 188 18ms 6 Feb 2026 304th AstroOrbis 529 189 12ms 10 Feb 2026 305th Chinay-Domitrix 🇺🇸 528 170 2,758ms 22 days ago 306th dokutan 528 355 104ms 3 days ago 307th CaedenHarper 🇨🇦 527 197 448ms 9 Feb 2026 308th Heathcorp 🇦🇺 526 190 14ms 8 Feb 2026 309th Shanethegamer 🇺🇸 524 112 42ms 6 Dec 2025 310th qrakhen 524 198 416ms 26 days ago 311th jared-hughes 523 164 12ms 9 Feb 2026 312th IISResetMe 522 115 373ms 24 days ago 313th retrohun 521 143 4ms 31 Jan 2026 314th MeWhenI 🇻🇦 517 144 23ms 21 Dec 2025 315th amazingalek 🇳🇴 511 203 409ms 26 Jan 2026 316th dokutan 504 184 3ms 26 Jan 2026 317th bpharaldsson 496 209 434ms 17 Feb 2026 318th BREMAUCY 🇫🇷 495 202 12ms 20 Feb 2026 319th Yax42 🇫🇷 493 174 22ms 21 Jan 2026 320th CaedenHarper 🇨🇦 492 143 861ms 4 Feb 2026 First Prev 241–320 of 421 Next Last