The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 26 hours. Why not try and solve them ahead of time?
Morse Decoder 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 321st stefangimmillaro 638 170 5ms 6 Feb 2023 322nd FlorianCassayre 🇫🇷 637 203 17ms 21 Oct 2023 322nd ahmetdemirag 🇨🇾 637 203 10ms 18 Nov 2024 324th Sp3000 🇦🇺 636 147 3ms 10 May 2021 325th ShiraJoseph 🇺🇸 636 191 13ms 28 Apr 2022 326th Natanaelel 🇸🇪 634 204 15ms 20 Jan 2023 327th unfinishedprogram 633 192 12ms 14 Jul 2023 328th eranws 630 193 11ms 1 Nov 2022 328th moikaturns 🇬🇧 630 193 10ms 10 Nov 2022 330th dokutan 628 162 1,233ms 8 Sep 2025 331st madex 🇩🇪 628 206 10ms 24 hours ago 332nd janbehrens 🇩🇪 627 180 3ms 6 May 2021 333rd gnlow 🇰🇷 627 194 10ms 18 Feb 2021 334th guilhem-roy 🇫🇷 625 207 10ms 25 Feb 2022 334th RDShah 625 207 10ms 16 Jan 2023 334th Pyroan 625 207 10ms 2 Mar 2025 337th MeWhenI 🇻🇦 625 209 603ms 27 Jan 2023 338th janbehrens 🇩🇪 623 195 11ms 17 Jun 2023 339th alexsave 620 196 10ms 14 Dec 2025 340th dokutan 619 199 168ms 8 Sep 2025 341st madex 🇩🇪 616 165 35ms 24 hours ago 342nd za3k 616 210 10ms 13 Oct 2022 343rd jacklynnepenick 615 152 3ms 29 Aug 2021 344th Kacarott 🇦🇺 615 201 163ms 24 Sep 2024 345th nullie 613 211 10ms 9 Jun 2022 345th janbehrens 🇩🇪 613 211 10ms 17 Jun 2023 347th snoozingnewt 🇨🇦 613 261 95ms 20 Nov 2025 348th quimey 607 213 10ms 17 Jul 2023 349th albanian-laundromat 606 168 1,651ms 4 Nov 2025 350th MeWhenI 🇻🇦 606 202 1,023ms 27 Jan 2023 351st snoozingnewt 🇨🇦 605 240 122ms 22 Dec 2025 352nd dokutan 604 230 425ms 9 Nov 2025 353rd commandz0 🇺🇸 602 215 15ms 6 Apr 2023 354th Lv0Sys 🇵🇱 601 169 35ms 30 Nov 2025 355th jupj 🇫🇮 601 220 1ms 26 Aug 2022 356th The3gs 599 216 10ms 13 Oct 2020 357th emgordon154 598 226 8ms 13 Dec 2024 358th abailey2020 🇺🇸 596 217 10ms 19 Aug 2020 358th CedricGebistorf 596 217 9ms 20 Feb 2022 358th cros107 🇦🇺 596 217 17ms 9 Sep 2025 358th Lv0Sys 🇵🇱 596 217 10ms 30 Nov 2025 362nd dokutan 593 188 3,231ms 8 Sep 2025 363rd Kibble 593 205 10ms 27 Jul 2020 364th janbehrens 🇩🇪 591 252 425ms 10 Jan 2022 365th snoozingnewt 🇨🇦 591 317 3ms 9 Nov 2025 366th bluebear94 585 174 158ms 2 Mar 2018 367th madex 🇩🇪 585 226 2ms 24 hours ago 368th yzhs 🇩🇪 583 222 10ms 23 Jun 2023 369th Shanethegamer 🇺🇸 583 482 1,610ms 13 Apr 2025 370th MeWhenI 🇻🇦 582 262 35ms 6 Jun 2023 371st emgordon154 581 211 1,262ms 19 Apr 2025 372nd j-Ewan 580 223 10ms 3 Mar 2022 373rd evan-schiewe 579 257 466ms 21 Nov 2021 374th MeWhenI 🇻🇦 579 439 1,812ms 7 Nov 2025 375th emgordon154 578 224 10ms 19 Apr 2025 376th PatrickStephansen 🇿🇦 576 211 11ms 8 Oct 2020 377th hoodadam 575 225 9ms 11 Jun 2019 377th sambirnbaum1 575 225 20ms 13 Oct 2019 377th RYNO8 575 225 10ms 13 Dec 2021 380th MeWhenI 🇻🇦 574 189 4ms 28 Jan 2023 381st neel11235813 573 214 607ms 31 Mar 2024 382nd pyrolitic 🇮🇪 570 227 11ms 6 Apr 2022 382nd neel11235813 570 227 10ms 22 Feb 2023 384th voytxt 🇨🇿 568 214 13ms 20 Feb 2025 385th MeWhenI 🇻🇦 568 330 2ms 10 Sep 2022 386th alangodfrey 567 228 10ms 31 Jan 2019 387th acotis 566 324 250ms 16 Feb 2026 388th wh3n3v3r 🇨🇿 565 229 10ms 18 Nov 2024 389th ydevor 🇮🇱 563 230 10ms 16 Feb 2021 389th andrewjc2000 563 230 10ms 16 Jul 2025 391st KatieLG 🇬🇧 561 450 2ms 22 Apr 2025 392nd janbehrens 🇩🇪 560 272 2,980ms 20 Nov 2022 393rd nullshallot 558 205 291ms 7 Jan 2025 394th bastienvoirin 🇫🇷 558 232 10ms 5 Apr 2020 395th janbehrens 🇩🇪 553 239 1ms 21 Mar 2022 396th GrayJoKing 🇦🇺 552 474 2ms 14 Nov 2020 397th h3ra993huskp 🇯🇵 549 253 675ms 30 Nov 2025 398th billings7 🇬🇧 547 272 375ms 19 May 2024 399th blaztoma 🇱🇹 546 266 150ms 1 Dec 2025 400th thisishowmymindworks 🇳🇴 543 224 11ms 5 Jun 2024 First Prev 321–400 of 902 Next Last
