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?
Sudoku (Fill-in) 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 bac0id 428 419 496ms 22 Feb 2024 322nd Natanaelel 🇸🇪 423 306 1,949ms 1 Oct 2021 323rd tomh1012 418 370 48ms 20 days ago 324th annaproxy 417 371 2,953ms 1 May 2022 325th MeWhenI 🇻🇦 414 257 496ms 12 Nov 2022 326th KatieLG 🇬🇧 413 362 18ms 28 Nov 2022 327th bac0id 409 487 657ms 23 Feb 2024 328th CatsAreFluffy 407 389 2ms 27 Jan 2023 329th dillon-duncando 406 381 15ms 11 Oct 2022 330th IanUtley 399 366 33ms 21 Dec 2022 331st KatieLG 🇬🇧 397 304 71ms 26 Dec 2023 332nd KatieLG 🇬🇧 397 358 962ms 15 Jan 2024 333rd Waffle3z 396 415 124ms 26 Apr 2021 334th CaedenHarper 🇨🇦 389 362 4,152ms 25 Sep 2025 335th MeWhenI 🇻🇦 388 443 630ms 28 Feb 2022 336th neihousaigaai 387 515 729ms 10 May 2021 337th Natanaelel 🇸🇪 385 187 12ms 5 Nov 2025 338th ericlangedijk 🇸🇮 385 465 516ms 13 Mar 2022 339th MeWhenI 🇻🇦 382 391 40ms 22 Sep 2021 340th madex 🇩🇪 382 405 30ms 21 Mar 2025 341st blaztoma 🇱🇹 379 276 15ms 13 Dec 2025 342nd Ripick 379 525 612ms 24 Jul 2023 343rd arctouch-cristiannevianna 378 474 547ms 6 Mar 2024 344th Natanaelel 🇸🇪 377 532 162ms 10 Dec 2024 345th yzhs 🇩🇪 375 535 430ms 27 Jul 2021 346th Babafaba 374 413 921ms 26 Oct 2025 347th JOrE20 370 404 18ms 7 Feb 2026 348th nullie 365 424 13ms 17 Jun 2022 349th TaserTheFox 🇺🇸 361 428 715ms 23 May 2023 350th blaztoma 🇱🇹 361 508 208ms 10 Dec 2025 351st fynnkroeger 360 430 23ms 1 May 2021 351st wh3n3v3r 🇨🇿 360 430 27ms 18 Nov 2024 353rd Babafaba 359 396 932ms 26 Oct 2025 354th aaronze 🇦🇺 359 416 37ms 2 May 2021 355th MeWhenI 🇻🇦 353 419 216ms 3 Aug 2024 356th KatieLG 🇬🇧 353 534 108ms 20 Jan 2023 357th Natanaelel 🇸🇪 351 426 15ms 11 Dec 2021 358th eiburns 351 441 28ms 10 May 2023 359th janbehrens 🇩🇪 350 427 3,318ms 2 Sep 2024 360th MeWhenI 🇻🇦 350 469 15ms 30 Sep 2021 361st janbehrens 🇩🇪 349 443 481ms 17 Jun 2023 362nd janbehrens 🇩🇪 346 575 925ms 31 Dec 2021 363rd janbehrens 🇩🇪 345 511 3,072ms 20 Nov 2022 364th FlorianCassayre 🇫🇷 344 449 314ms 17 Oct 2022 365th janbehrens 🇩🇪 342 502 334ms 5 Jul 2023 366th janbehrens 🇩🇪 337 470 17ms 21 Mar 2022 367th rsgray 330 468 325ms 7 Feb 2024 368th mathisfun271 329 470 20ms 6 Mar 2024 369th janbehrens 🇩🇪 328 525 824ms 26 Mar 2022 370th madex 🇩🇪 324 488 3ms 6 Nov 2024 371st jerrandolph 323 724 362ms 1 Oct 2025 372nd retrohun 320 602 213ms 2 Jan 2023 373rd MeWhenI 🇻🇦 317 809 2,268ms 1 Jan 2022 374th coreynash 313 478 28ms 4 Mar 2024 375th knutae 🇳🇴 311 498 31ms 18 Jul 2021 376th strout 310 647 612ms 19 Aug 2022 377th janbehrens 🇩🇪 307 433 1,119ms 24 Feb 2022 378th janbehrens 🇩🇪 307 583 548ms 31 Dec 2021 379th MaxElf999 304 508 11ms 29 Sep 2022 380th Lv0Sys 🇵🇱 302 495 15ms 26 days ago 381st CaedenHarper 🇨🇦 285 525 19ms 28 Aug 2025 382nd prestosilver 🇺🇸 281 708 417ms 32 hours ago 383rd TheZwierzLF 🇵🇱 279 554 25ms 25 Dec 2025 384th kmathis22 279 714 508ms 5 Feb 2026 384th CaedenHarper 🇨🇦 279 714 571ms 4 days ago 386th hjcafaroUC 277 559 236ms 12 Jun 2021 387th Lv0Sys 🇵🇱 275 562 16ms 20 Feb 2026 388th twocatsinatrenchcoat 268 578 15ms 16 Apr 2022 389th targrik 268 641 36ms 1 Feb 2025 390th LukeBridges 🇬🇧 267 559 18ms 24 Sep 2024 391st TheZwierzLF 🇵🇱 263 460 170ms 5 Jan 2026 392nd OllieBoyne 🇬🇧 263 588 26ms 15 May 2021 393rd QuincyNash 🇺🇸 262 591 1,912ms 4 Dec 2022 394th CaedenHarper 🇨🇦 261 686 552ms 21 Oct 2025 395th JOrE20 260 594 20ms 22 Feb 2026 396th mbittner20 254 610 261ms 14 Apr 2025 397th mokymok 🇺🇸 251 615 25ms 15 Dec 2021 398th TimCurwick 🇺🇸 250 619 416ms 28 Apr 2021 399th ValentinCassayre 249 620 115ms 19 Oct 2022 400th galloj 🇨🇿 244 634 20ms 24 Feb 2023 First Prev 321–400 of 495 Next Last
