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?
Spelling Numbers 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 321st janbehrens 🇩🇪 720 369 400ms 21 Nov 2021 322nd timvermeulen 719 496 208ms 5 Jan 2020 323rd MeWhenI 🇻🇦 717 232 11ms 25 Jun 2021 324th emgordon154 715 621 1,490ms 4 Oct 2025 325th o0lit3 🇺🇸 714 133 96ms 12 Apr 2021 326th Yewzir 🇧🇪 713 512 302ms 5 Jan 2024 327th jacobly0 🇺🇸 711 637 1,786ms 22 Apr 2024 328th sultan 710 374 418ms 26 Feb 2024 329th MeWhenI 🇻🇦 710 507 35ms 7 Jun 2023 330th emgordon154 709 201 139ms 10 Aug 2024 331st ian-h-chamberlain 🇺🇸 709 503 206ms 3 Nov 2025 332nd JOrE20 709 564 64ms 18 Feb 2026 333rd Betuaredead 706 68 9ms 12 Jan 2023 334th orthoplex 🇨🇽 705 158 26ms 9 Oct 2022 335th helbling 🇨🇭 705 236 13ms 1 Jul 2024 336th rak1507 🇬🇧 705 256 3ms 9 May 2022 337th SirBogman 🇺🇸 704 165 36ms 27 Jan 2024 338th Shanethegamer 🇺🇸 704 365 96ms 3 Nov 2024 339th Bubbler-4 700 258 3ms 12 Jan 2022 340th jared-hughes 700 472 35ms 8 Jul 2024 341st jerrandolph 700 522 294ms 21 Oct 2023 342nd dokutan 699 226 1,501ms 24 Oct 2025 343rd dokutan 699 452 2,705ms 26 Oct 2024 344th anter69 🇭🇺 697 160 21ms 10 Mar 2022 345th emgordon154 697 444 8ms 7 days ago 346th annaproxy 695 427 228ms 14 Aug 2022 347th PatrickStephansen 🇿🇦 693 240 40ms 20 Oct 2020 348th MeWhenI 🇻🇦 693 477 38ms 29 Nov 2023 349th SirBogman 🇺🇸 692 196 712ms 2 Feb 2020 350th Natanaelel 🇸🇪 692 297 34ms 16 Feb 2024 351st stefangimmillaro 692 515 260ms 15 Nov 2023 352nd sean-niemann 🇺🇸 691 313 9ms 21 Apr 2023 353rd Yax42 🇫🇷 690 385 438ms 9 hours ago 354th RussellEmerine 688 431 198ms 2 May 2020 355th dcgjb 685 196 775ms 22 Feb 2024 356th dokutan 684 353 5ms 10 Apr 2025 357th bstrautin 681 197 333ms 26 Jul 2020 358th elgan65536 🇺🇸 681 524 253ms 9 Nov 2025 359th stefangimmillaro 681 536 287ms 5 May 2025 360th CatsAreFluffy 680 436 236ms 18 Dec 2023 361st yzhs 🇩🇪 679 437 219ms 25 Jul 2021 362nd dokutan 678 276 5ms 26 Dec 2025 363rd SirBogman 🇺🇸 678 303 40ms 9 Sep 2022 364th GolfingSuccess 🇬🇷 678 373 21ms 18 Aug 2024 365th CornerMercury 🇬🇧 675 165 23ms 23 Dec 2025 366th JRaspass 🇬🇧 675 541 292ms 23 Sep 2022 367th solmyr2000 671 391 531ms 18 Jun 2022 368th janAkali 🇷🇺 671 470 408ms 21 Jan 2026 369th Shanethegamer 🇺🇸 668 393 441ms 19 Jun 2022 370th tobeannouncd 668 444 223ms 12 Jan 2024 371st elisherer 🇮🇱 666 250 12ms 8 Apr 2019 372nd emgordon154 664 381 16ms 22 Sep 2024 373rd targrik 663 413 11ms 17 Jan 2025 374th CaedenHarper 🇨🇦 661 239 1,244ms 2 Sep 2025 375th KasperKivimaeki 🇫🇮 661 397 444ms 19 Nov 2025 376th stefangimmillaro 657 365 1,271ms 4 Oct 2022 377th CaedenHarper 🇨🇦 657 404 388ms 16 Oct 2025 377th prestosilver 🇺🇸 657 404 430ms 29 hours ago 379th duckyluuk 🇳🇱 656 170 34ms 6 Sep 2024 380th Shanethegamer 🇺🇸 656 351 477ms 26 Oct 2024 381st Shanethegamer 🇺🇸 654 276 3ms 27 May 2024 382nd iznax 654 406 397ms 21 Nov 2021 383rd Shanethegamer 🇺🇸 649 372 3ms 11 Sep 2022 384th DialFrost 🇸🇬 649 396 119ms 26 Nov 2025 385th Artemis21 🇬🇧 648 172 20ms 21 Jan 2025 386th sean-niemann 🇺🇸 648 410 463ms 20 Oct 2024 387th klixel 🇨🇦 648 550 190ms 19 Jun 2023 388th lifthrasiir 🇰🇷 647 279 3ms 28 Nov 2024 389th KatieLG 🇬🇧 644 412 408ms 21 Nov 2021 390th SirBogman 🇺🇸 642 281 5ms 8 Aug 2024 391st error256 642 353 1,958ms 8 Jun 2025 392nd ReidZ3 🇺🇸 641 463 228ms 2 Dec 2020 392nd boxjelly 641 463 227ms 14 Mar 2022 394th jgbaldwinbrown 641 570 290ms 6 Jul 2021 395th tayloia 🇬🇧 640 260 13ms 15 May 2023 396th citsur 639 464 244ms 20 Jun 2019 397th jbbarth 🇫🇷 638 182 42ms 11 Aug 2021 398th MeWhenI 🇻🇦 637 379 3ms 10 Sep 2022 399th ovs-code 🇩🇪 637 412 443ms 3 Jun 2024 400th MeWhenI 🇻🇦 636 404 105ms 12 Dec 2022 First Prev 321–400 of 1,081 Next Last