The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Morse Decoder 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 ImpressedByRocks 375 237 14ms 20 Sep 2022 482nd MeWhenI 🇻🇦 375 354 1,468ms 30 Oct 2023 483rd benwilliamgraham 374 238 11ms 10 Nov 2021 484th wh3n3v3r 🇨🇿 373 260 10ms 11 Nov 2024 485th MeWhenI 🇻🇦 373 738 1,514ms 9 Feb 2025 486th masinag 🇮🇹 371 345 2ms 5 Nov 2024 487th dokutan 371 742 1,526ms 12 Jan 2025 488th ArmaanAS 369 241 11ms 25 Mar 2021 489th yuchuehw 366 243 11ms 4 Jan 2024 489th CLOStrophobic 🇮🇹 366 243 10ms 26 Jan 2025 491st fuchen 362 421 1,393ms 11 May 2020 492nd dtbao20 🇻🇳 360 247 11ms 1 Oct 2024 492nd InigoK 🇺🇸 360 247 10ms 6 Sep 2025 494th Yewzir 🇧🇪 360 691 1,982ms 15 Nov 2025 495th scpchicken 🇵🇼 359 248 16ms 7 Apr 2022 496th skps2010 357 249 16ms 28 Dec 2018 496th Indivicivet 357 249 10ms 18 Oct 2021 498th tomh1012 357 382 415ms 16 Dec 2025 499th guliyevemil1 🇦🇿 355 515 335ms 16 Apr 2020 500th Phanabani 🇺🇸 353 252 10ms 22 Oct 2020 501st frederikb 352 354 711ms 9 Sep 2020 502nd cellobix 350 254 17ms 15 Aug 2019 503rd Ted-Barrett 🇦🇺 349 255 10ms 1 Oct 2021 504th yuchuehw 348 358 666ms 4 Jan 2024 505th daedals 346 257 17ms 21 Jun 2019 505th rollershutter 346 257 11ms 9 Sep 2022 507th scpchicken 🇵🇼 343 189 150ms 7 Apr 2022 508th bstrautin 342 249 283ms 5 Jun 2020 509th schachmattmatt 342 260 10ms 20 Aug 2021 510th Natanaelel 🇸🇪 342 301 6ms 23 Jun 2023 511th msbranicky 342 535 345ms 31 Aug 2023 512th hiichbindermax 338 263 10ms 22 Nov 2025 513th williamlake 338 527 131ms 17 Sep 2021 514th janbehrens 🇩🇪 337 180 3ms 6 May 2021 515th robin-scragg 337 264 11ms 23 Jul 2025 516th yokasuretsu 336 265 10ms 26 Apr 2018 516th petar-donchev 336 265 10ms 8 Sep 2019 516th JunkIce 336 265 17ms 24 Nov 2024 519th proton 🇩🇪 335 195 41ms 9 Jun 2020 519th jaredcrystal 🇺🇸 335 195 35ms 14 Dec 2020 521st krcs 🇵🇱 334 266 10ms 30 Jun 2023 522nd Dazza314 🇬🇧 333 267 10ms 4 Nov 2020 523rd kmathis22 333 374 415ms 6 Feb 2026 524th Laksen 🇩🇰 333 562 27ms 8 Jul 2021 525th myfatemi04 332 268 10ms 20 Sep 2018 525th Evan-Robotics 332 268 10ms 28 Jan 2022 527th dokutan 332 434 9ms 4 Feb 2025 528th Bonjour27891 🇻🇳 331 269 12ms 20 Mar 2022 529th msbranicky 330 484 2ms 14 Oct 2023 530th glesnick 327 272 10ms 15 Jul 2022 531st vibdev 326 298 12ms 26 Aug 2021 532nd bkshrader 325 274 16ms 27 Dec 2018 533rd JunkIce 323 265 486ms 3 Dec 2024 534th geofft 323 275 10ms 13 Dec 2020 534th mbittner20 323 275 10ms 21 Jan 2024 536th DrakeSeteraO 322 276 10ms 10 Nov 2025 536th GodlyProgrammer1 322 276 19ms 22 Nov 2025 538th KatieLG 🇬🇧 322 424 379ms 24 Oct 2022 539th dokutan 322 481 668ms 3 Feb 2026 540th naveenarun 319 279 10ms 6 Jun 2019 541st wuminws 319 318 3,310ms 20 Feb 2025 542nd rvdnieuwendijk 🇳🇱 318 268 335ms 29 Jun 2020 543rd NanduBC 318 280 11ms 22 Mar 2021 544th marcin7Cd 318 412 44ms 11 Mar 2021 545th Emutis 🇱🇹 317 281 10ms 14 Nov 2025 546th postie77 317 431 419ms 2 May 2023 547th amollberg 🇸🇪 312 285 17ms 15 Jan 2022 548th galloj 🇨🇿 312 330 2ms 17 Jan 2023 549th luuumine 🇫🇷 311 286 10ms 29 Oct 2025 550th mrxz 🇳🇱 311 312 10ms 23 Jun 2024 551st bbakersmith 310 361 16ms 31 Jul 2021 552nd dylanarmstrong 309 314 11ms 15 Sep 2024 553rd Anonymousellama21 308 334 2ms 16 May 2022 554th karhuthebear 307 290 10ms 5 May 2022 554th SniperSmiley 🇺🇸 307 290 10ms 4 Jul 2022 556th MeWhenI 🇻🇦 307 416 2ms 25 Aug 2023 557th davecame 306 291 10ms 15 Mar 2024 558th LukeBridges 🇬🇧 306 317 11ms 21 Aug 2024 559th JVerwolf 305 292 15ms 27 Aug 2021 560th Yewzir 🇧🇪 304 293 10ms 19 May 2023 First Prev 481–560 of 896 Next Last
