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?
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 FlorianCassayre 🇫🇷 637 203 17ms 21 Oct 2023 321st ahmetdemirag 🇨🇾 637 203 10ms 18 Nov 2024 323rd Sp3000 🇦🇺 636 147 3ms 10 May 2021 324th ShiraJoseph 🇺🇸 636 191 13ms 28 Apr 2022 325th Natanaelel 🇸🇪 634 204 15ms 20 Jan 2023 326th unfinishedprogram 633 192 12ms 14 Jul 2023 327th eranws 630 193 11ms 1 Nov 2022 327th moikaturns 🇬🇧 630 193 10ms 10 Nov 2022 329th dokutan 628 162 1,434ms 8 Sep 2025 330th janbehrens 🇩🇪 627 180 3ms 6 May 2021 331st gnlow 🇰🇷 627 194 10ms 18 Feb 2021 332nd guilhem-roy 🇫🇷 625 207 10ms 25 Feb 2022 332nd RDShah 625 207 10ms 16 Jan 2023 332nd Pyroan 625 207 10ms 2 Mar 2025 335th MeWhenI 🇻🇦 625 209 603ms 27 Jan 2023 336th janbehrens 🇩🇪 623 195 11ms 17 Jun 2023 337th alexsave 620 196 10ms 14 Dec 2025 338th dokutan 619 199 168ms 8 Sep 2025 339th za3k 616 210 10ms 13 Oct 2022 340th jacklynnepenick 615 152 3ms 29 Aug 2021 341st Kacarott 🇦🇺 615 201 163ms 24 Sep 2024 342nd nullie 613 211 10ms 9 Jun 2022 342nd janbehrens 🇩🇪 613 211 10ms 17 Jun 2023 344th snoozingnewt 🇨🇦 613 261 95ms 20 Nov 2025 345th quimey 607 213 10ms 17 Jul 2023 346th albanian-laundromat 606 168 1,572ms 4 Nov 2025 347th MeWhenI 🇻🇦 606 202 1,023ms 27 Jan 2023 348th snoozingnewt 🇨🇦 605 240 122ms 22 Dec 2025 349th dokutan 604 230 425ms 9 Nov 2025 350th commandz0 🇺🇸 602 215 15ms 6 Apr 2023 351st Lv0Sys 🇵🇱 601 169 35ms 30 Nov 2025 352nd jupj 🇫🇮 600 220 1ms 26 Aug 2022 353rd The3gs 599 216 10ms 13 Oct 2020 354th emgordon154 598 226 8ms 13 Dec 2024 355th abailey2020 🇺🇸 596 217 10ms 19 Aug 2020 355th CedricGebistorf 596 217 9ms 20 Feb 2022 355th cros107 🇦🇺 596 217 17ms 9 Sep 2025 355th Lv0Sys 🇵🇱 596 217 10ms 30 Nov 2025 359th Kibble 593 205 10ms 27 Jul 2020 360th dokutan 592 188 3,231ms 8 Sep 2025 361st janbehrens 🇩🇪 591 252 425ms 10 Jan 2022 362nd snoozingnewt 🇨🇦 591 317 3ms 9 Nov 2025 363rd bluebear94 585 174 124ms 2 Mar 2018 364th yzhs 🇩🇪 583 222 10ms 23 Jun 2023 365th Shanethegamer 🇺🇸 583 482 1,610ms 13 Apr 2025 366th MeWhenI 🇻🇦 582 262 35ms 6 Jun 2023 367th emgordon154 581 211 1,262ms 19 Apr 2025 368th j-Ewan 580 223 10ms 3 Mar 2022 369th evan-schiewe 579 257 466ms 21 Nov 2021 370th MeWhenI 🇻🇦 579 439 1,812ms 7 Nov 2025 371st emgordon154 578 224 10ms 19 Apr 2025 372nd PatrickStephansen 🇿🇦 576 211 11ms 8 Oct 2020 373rd hoodadam 575 225 9ms 11 Jun 2019 373rd sambirnbaum1 575 225 20ms 13 Oct 2019 373rd RYNO8 575 225 10ms 13 Dec 2021 376th MeWhenI 🇻🇦 574 189 4ms 28 Jan 2023 377th neel11235813 573 214 607ms 31 Mar 2024 378th pyrolitic 🇮🇪 570 227 11ms 6 Apr 2022 378th neel11235813 570 227 10ms 22 Feb 2023 380th voytxt 🇨🇿 568 214 13ms 20 Feb 2025 381st MeWhenI 🇻🇦 568 330 2ms 10 Sep 2022 382nd alangodfrey 567 228 10ms 31 Jan 2019 383rd wh3n3v3r 🇨🇿 565 229 10ms 18 Nov 2024 384th acotis 565 324 250ms 16 Feb 2026 385th ydevor 🇮🇱 563 230 10ms 16 Feb 2021 385th andrewjc2000 563 230 10ms 16 Jul 2025 387th KatieLG 🇬🇧 561 450 2ms 22 Apr 2025 388th janbehrens 🇩🇪 560 272 3,200ms 20 Nov 2022 389th nullshallot 558 205 291ms 7 Jan 2025 390th bastienvoirin 🇫🇷 558 232 10ms 5 Apr 2020 391st janbehrens 🇩🇪 552 239 1ms 21 Mar 2022 392nd GrayJoKing 🇦🇺 552 474 2ms 14 Nov 2020 393rd h3ra993huskp 🇯🇵 549 253 675ms 30 Nov 2025 394th billings7 🇬🇧 547 272 375ms 19 May 2024 395th blaztoma 🇱🇹 546 266 150ms 1 Dec 2025 396th thisishowmymindworks 🇳🇴 543 224 11ms 5 Jun 2024 397th dokutan 542 249 7ms 20 Feb 2025 398th marcin7Cd 541 239 15ms 14 Mar 2020 399th olivermrose 🇺🇸 540 188 38ms 28 Oct 2021 400th jacklynnepenick 537 241 11ms 28 Aug 2021 First Prev 321–400 of 899 Next Last
