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 481st MarcMush 🇫🇷 447 206 1,168ms 4 Feb 2024 482nd olleicua 🇺🇸 446 228 38ms 28 May 2024 483rd davecame 445 291 10ms 15 Mar 2024 484th Waffle3z 445 339 2ms 22 Oct 2020 485th karhuthebear 443 292 10ms 5 May 2022 486th janAkali 🇷🇺 441 391 415ms 2 Jun 2025 487th tatzyr 🇯🇵 440 231 35ms 24 Feb 2025 488th yokasuretsu 438 232 37ms 26 Apr 2018 489th petar-donchev 437 296 10ms 8 Sep 2019 489th JVerwolf 437 296 15ms 26 Aug 2021 491st c0d3-4-F00d 🇩🇪 437 302 2ms 11 Feb 2022 492nd SniperSmiley 🇺🇸 434 298 10ms 4 Jul 2022 493rd dokutan 434 347 2ms 17 Apr 2024 494th yokasuretsu 433 235 138ms 28 Jun 2018 495th MeWhenI 🇻🇦 431 354 1,468ms 30 Oct 2023 496th kaascevich 429 373 1,033ms 14 Sep 2025 497th msrawson 428 302 10ms 2 Sep 2018 497th Bonjour27891 🇻🇳 428 302 11ms 13 Mar 2022 499th JRaspass 🇬🇧 427 264 3ms 5 Sep 2021 500th BenBanerjeeRichards 426 304 10ms 12 Nov 2021 501st hyvyys 424 287 11ms 18 Sep 2020 502nd LorenzoTa 423 267 4ms 27 Apr 2019 503rd fgrosshans 🇫🇷 423 306 10ms 9 May 2023 504th TheZwierzLF 🇵🇱 420 292 848ms 14 Dec 2025 505th dokutan 420 394 2ms 4 Feb 2026 506th AlexDaniel 🇪🇪 419 243 124ms 13 Mar 2018 507th hamhub7 418 356 467ms 18 Aug 2022 508th eiburns 416 311 10ms 25 Aug 2023 509th snoozingnewt 🇨🇦 416 334 538ms 4 Nov 2025 510th rvdnieuwendijk 🇳🇱 414 276 335ms 29 Jun 2020 511th robymus 413 246 35ms 18 Sep 2018 512th ericlangedijk 🇸🇮 411 362 432ms 19 Mar 2022 513th nephila-nacrea 🇬🇧 410 275 3ms 21 Mar 2018 514th proton 🇩🇪 408 249 41ms 9 Jun 2020 515th patbassing 406 319 10ms 8 Jul 2019 515th dymowski 406 319 10ms 3 Jan 2020 517th lukechampine 404 476 320ms 19 Apr 2020 518th amazingalek 🇳🇴 403 369 448ms 20 Jan 2026 519th graft 402 253 36ms 10 Mar 2018 520th CarsonChr 🇺🇸 402 370 502ms 21 Jan 2025 521st jerrandolph 401 480 317ms 21 Apr 2020 522nd Yewzir 🇧🇪 400 413 2ms 18 Oct 2023 523rd mathisfun271 399 324 10ms 19 Feb 2024 524th vibdev 397 306 12ms 26 Aug 2021 525th NicoAdams 397 326 10ms 30 Dec 2021 526th labster 396 285 3ms 25 Feb 2018 527th edre 393 329 10ms 30 Apr 2018 528th relet 392 330 16ms 9 Aug 2018 528th TobyBoyne 🇬🇧 392 330 13ms 15 Apr 2022 528th neihousaigaai 392 330 10ms 14 Feb 2024 531st mizuzimu 391 331 11ms 16 Mar 2021 532nd LeeCamp 390 332 18ms 25 Dec 2021 533rd tomh1012 390 382 415ms 16 Dec 2025 534th albanian-laundromat 386 335 11ms 3 Apr 2025 535th kurkale6ka 385 336 15ms 28 Dec 2023 536th juliansiebert 🇩🇪 384 298 337ms 20 Jan 2023 537th zdzc 384 337 11ms 1 Apr 2018 538th masinag 🇮🇹 383 345 2ms 5 Nov 2024 539th TheDrawingCoder-Gamer 383 393 2ms 6 Jul 2025 540th dylanarmstrong 382 318 11ms 15 Sep 2024 541st bac0id 382 390 461ms 4 Jul 2024 542nd tpaxman 🇨🇦 381 340 11ms 17 Dec 2020 542nd OllieBoyne 🇬🇧 381 340 10ms 14 Apr 2022 544th MeWhenI 🇻🇦 380 740 1,599ms 9 Feb 2025 545th yuchuehw 379 366 666ms 4 Jan 2024 546th mcreenan 378 269 137ms 16 Jun 2018 547th dokutan 378 744 1,510ms 12 Jan 2025 548th KatieLG 🇬🇧 375 345 10ms 19 Jul 2025 549th LukeBridges 🇬🇧 374 325 11ms 21 Aug 2024 550th 77Tigers 374 346 10ms 2 Mar 2021 551st neihousaigaai 372 327 10ms 14 May 2021 552nd GodlyProgrammer1 370 350 10ms 22 Nov 2025 553rd fuchen 370 427 1,393ms 11 May 2020 554th SirFireball3521 369 276 138ms 1 Mar 2023 555th jfallon1997 369 351 10ms 24 Aug 2022 556th guliyevemil1 🇦🇿 368 523 335ms 16 Apr 2020 557th TimCurwick 🇺🇸 365 313 278ms 28 Jul 2020 558th Natanaelel 🇸🇪 364 301 6ms 23 Jun 2023 559th JOrE20 364 334 13ms 27 Jan 2026 560th kmathis22 364 382 415ms 6 Feb 2026 First Prev 481–560 of 899 Next Last
