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 Encoder in all languages in chars. 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 Chars Time Submitted 481st janbehrens 🇩🇪 452 300 449ms 20 Nov 2022 482nd zakariamouhid 450 242 9ms 4 Jun 2023 483rd prestosilver 🇺🇸 449 340 371ms 2 days ago 484th proton 🇩🇪 448 180 38ms 20 Jun 2020 485th skps2010 448 208 17ms 29 Dec 2018 485th yzhs 🇩🇪 448 208 10ms 25 Oct 2020 487th msrawson 446 209 10ms 1 Sep 2018 488th Andrey-Plotnikov 445 245 17ms 9 Nov 2024 489th MeWhenI 🇻🇦 442 155 3ms 16 Apr 2023 490th andrewjc2000 442 211 10ms 18 Jul 2025 491st Jacob385 441 196 416ms 1 May 2024 491st Mabeloid 🇳🇴 441 196 560ms 21 Sep 2024 493rd scpchicken 🇵🇼 440 156 3ms 25 Feb 2023 494th hoodadam 440 212 12ms 12 Jun 2019 494th mhsaul 440 212 12ms 10 Apr 2023 494th ceeb9 440 212 13ms 14 Jun 2024 494th Pulencode 🇨🇨 440 212 10ms 17 Nov 2024 498th jaredcrystal 🇺🇸 438 184 35ms 14 Dec 2020 499th arctouch-cristiannevianna 437 244 470ms 29 Feb 2024 500th janbehrens 🇩🇪 435 277 2ms 21 Mar 2022 501st pickerj 434 215 11ms 4 Jun 2024 501st frankgraziano 434 215 16ms 5 Apr 2025 503rd Indivicivet 432 216 19ms 19 Oct 2021 504th villfa 432 262 4ms 21 May 2019 505th scpchicken 🇵🇼 429 170 154ms 25 Feb 2023 506th ArmaanAS 428 218 10ms 26 Mar 2021 506th Lwi-Sandwich 428 218 11ms 20 Jul 2023 508th bbakersmith 427 334 26ms 31 Jul 2021 509th stefangimmillaro 426 264 2ms 28 Oct 2025 510th GrayJoKing 🇦🇺 426 811 2ms 23 Jul 2020 511th Giantnoodlemonster 425 284 2ms 29 Sep 2024 512th emgordon154 424 243 3,290ms 17 May 2025 513th two-bad 🇬🇧 424 257 11ms 28 Feb 2024 514th jwhear 🇺🇸 423 408 1,843ms 30 Sep 2024 515th zuparnowa 422 221 10ms 8 Feb 2019 515th froggy2001 422 221 17ms 16 Feb 2023 517th yzhs 🇩🇪 420 262 32ms 6 Sep 2020 518th kmathis22 420 330 497ms 6 Feb 2026 519th helbling 🇨🇭 419 260 13ms 15 Jun 2024 520th msbranicky 419 371 2ms 12 Aug 2023 521st ian-h-chamberlain 🇺🇸 417 348 42ms 21 Oct 2025 522nd didion0 🇺🇸 415 263 11ms 2 Feb 2021 523rd hamhub7 413 258 429ms 18 Aug 2022 524th mathisfun271 411 227 10ms 18 Dec 2023 524th yuchuehw 411 227 10ms 4 Jan 2024 526th varhammer 410 369 9ms 23 Nov 2021 527th yzhs 🇩🇪 409 438 120ms 25 Jul 2021 528th janbehrens 🇩🇪 408 168 3ms 23 Sep 2021 529th amollberg 🇸🇪 407 229 18ms 16 Jan 2022 530th ejmejm 405 230 10ms 2 Dec 2021 531st postie77 405 263 410ms 10 May 2023 532nd moikaturns 🇬🇧 404 270 10ms 10 Nov 2022 533rd argusdusty 🇺🇸 400 233 17ms 11 Jan 2021 533rd moustave 400 233 10ms 28 Mar 2025 535th revlayle 🇺🇸 399 267 479ms 23 Jun 2023 536th madex 🇩🇪 398 303 2ms 11 Jun 2025 537th olleicua 🇺🇸 397 203 36ms 1 Apr 2024 538th Schmitt-Very-Cool 395 351 425ms 2 Oct 2025 539th iznax 390 273 434ms 21 Nov 2021 540th Phanabani 🇺🇸 389 240 10ms 22 Oct 2020 541st fitzdotlol 🇺🇸 389 280 20ms 21 Mar 2022 542nd labster 388 188 159ms 10 Mar 2018 543rd ericlangedijk 🇸🇮 388 482 61ms 23 Feb 2022 544th wh3n3v3r 🇨🇿 387 282 12ms 11 Nov 2024 545th snoozingnewt 🇨🇦 385 360 554ms 14 Sep 2025 546th DaCoolOne 384 385 2ms 27 Feb 2020 547th yuchuehw 382 363 673ms 4 Jan 2024 548th erin-allison 381 242 308ms 31 Mar 2021 549th MeWhenI 🇻🇦 381 729 1,672ms 9 Feb 2025 550th bastienvoirin 🇫🇷 379 246 12ms 30 Nov 2020 551st LucaArgentiUCF 🇮🇹 378 476 46ms 25 Jan 2021 552nd neihousaigaai 377 289 9ms 15 Mar 2021 553rd Blendi-Goose 376 393 2ms 5 Oct 2025 554th jgbaldwinbrown 376 429 323ms 9 Jul 2021 555th ian-h-chamberlain 🇺🇸 376 453 236ms 4 Aug 2022 556th amazingalek 🇳🇴 374 285 443ms 29 Dec 2025 557th yokasuretsu 372 196 134ms 4 May 2018 558th petar-donchev 371 251 11ms 7 Sep 2019 559th ForkKILLET 🇨🇳 371 294 10ms 21 Feb 2021 559th CaedenHarper 🇨🇦 371 294 11ms 6 Nov 2025 First Prev 481–560 of 1,003 Next Last