The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 26 hours. 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 401st MeWhenI 🇻🇦 636 404 105ms 12 Dec 2022 402nd MeWhenI 🇻🇦 634 486 23ms 18 Nov 2021 403rd arcpolaris 632 420 450ms 20 Nov 2024 404th duckyluuk 🇳🇱 629 167 377ms 6 Sep 2024 405th XenThe 🇬🇧 626 266 12ms 23 Jun 2025 406th KatieLG 🇬🇧 624 186 37ms 2 Oct 2025 407th MeWhenI 🇻🇦 623 421 445ms 26 May 2023 408th stefangimmillaro 623 426 411ms 4 Oct 2022 409th primo-ppcg 🇹🇭 622 383 473ms 29 Sep 2021 410th prplz 🇦🇺 619 180 25ms 19 Oct 2020 411th snyderek 🇺🇸 619 424 450ms 29 Oct 2024 412th emgordon154 618 562 14ms 10 Jun 2025 413th MeWhenI 🇻🇦 617 336 4ms 11 Oct 2023 414th ndren 616 181 21ms 27 Jan 2026 415th RYNO8 612 182 22ms 2 Sep 2021 415th guilhem-roy 🇫🇷 612 182 18ms 5 Oct 2022 417th janbehrens 🇩🇪 611 377 574ms 25 Mar 2022 418th rbertram90 🇬🇧 611 448 6ms 3 May 2025 419th KatieLG 🇬🇧 610 393 1,433ms 25 Apr 2021 420th Laksen 🇩🇰 609 656 25ms 9 Jul 2021 421st h3ra993huskp 🇯🇵 608 392 578ms 30 Nov 2025 422nd iliaspapa 606 184 19ms 10 Dec 2025 423rd neihousaigaai 605 394 454ms 2 Apr 2021 423rd kmathis22 605 394 491ms 7 Dec 2025 425th alphafalfa 601 360 6ms 25 Oct 2024 426th postie77 601 442 393ms 23 May 2023 427th snoozingnewt 🇨🇦 600 175 425ms 21 Nov 2025 428th arctouch-cristiannevianna 599 443 398ms 28 Feb 2024 429th MeWhenI 🇻🇦 598 385 574ms 4 Mar 2022 430th edre 596 187 14ms 2 Jun 2018 431st Shanethegamer 🇺🇸 594 160 7ms 19 Dec 2021 432nd janbehrens 🇩🇪 592 403 443ms 5 Jul 2021 433rd emgordon154 592 405 1,544ms 20 Nov 2024 434th jared-hughes 591 444 447ms 17 Jul 2022 435th msbranicky 591 603 267ms 6 Oct 2023 436th malworthy 589 451 405ms 18 Oct 2023 437th namelessiw 586 407 454ms 10 Oct 2025 438th SmartK8 🇨🇿 586 453 433ms 12 Nov 2022 439th cjdyer 585 449 544ms 14 days ago 439th hazzery 585 449 542ms 14 days ago 441st Yewzir 🇧🇪 584 138 30ms 24 Dec 2023 442nd FlorianCassayre 🇫🇷 584 191 21ms 4 Nov 2022 443rd mrmena 🇦🇺 584 580 44ms 8 May 2024 444th albanian-laundromat 583 371 5ms 11 Jul 2025 445th Shanethegamer 🇺🇸 581 372 4ms 19 Jun 2022 446th sean-niemann 🇺🇸 576 414 516ms 24 Sep 2025 446th dokutan 576 414 581ms 23 Oct 2025 448th olivermrose 🇺🇸 572 203 68ms 25 Sep 2021 449th Kacarott 🇦🇺 572 396 86ms 13 Sep 2024 450th ovs-code 🇩🇪 571 379 4ms 11 Feb 2024 451st ian-h-chamberlain 🇺🇸 571 640 293ms 23 Nov 2025 452nd albanian-laundromat 569 196 127ms 3 Jul 2025 453rd ericlangedijk 🇸🇮 569 702 27ms 18 Feb 2022 454th sultan 566 421 442ms 26 Feb 2024 455th dokutan 565 179 46ms 25 Aug 2024 456th Natanaelel 🇸🇪 564 206 202ms 16 Feb 2024 457th janlelis 564 295 11ms 15 Aug 2022 457th Shanethegamer 🇺🇸 564 295 12ms 17 Dec 2024 459th Lv0Sys 🇵🇱 564 408 469ms 28 Nov 2025 460th MeWhenI 🇻🇦 562 385 5ms 5 Jul 2024 461st lacroixjonathan87 562 487 9ms 6 Sep 2020 462nd CaedenHarper 🇨🇦 561 425 435ms 8 days ago 463rd Andriamanitra 🇫🇮 560 411 476ms 25 Aug 2022 464th stefangimmillaro 560 426 500ms 6 Oct 2025 465th uttumuttu 🇫🇮 558 298 12ms 8 Apr 2022 466th MeWhenI 🇻🇦 557 369 36ms 13 Dec 2021 467th logvp 555 201 20ms 26 Dec 2023 468th msbranicky 554 436 3ms 10 Aug 2023 469th Yewzir 🇧🇪 553 475 1,876ms 27 Jan 2024 470th roavin 552 481 425ms 30 Jun 2022 470th codewrite 🇬🇧 552 481 419ms 31 Dec 2025 472nd neihousaigaai 551 302 13ms 19 Mar 2021 473rd ericlangedijk 🇸🇮 550 483 417ms 18 Mar 2022 474th annaproxy 550 560 18ms 13 Jan 2023 475th Flekay 🇩🇪 549 203 21ms 15 Feb 2026 476th Shanethegamer 🇺🇸 548 136 194ms 14 Dec 2022 477th tsunderu 🇯🇵 548 395 4ms 10 Sep 2021 478th jacklynnepenick 546 204 13ms 30 Aug 2021 478th annaproxy 546 204 21ms 12 Aug 2022 480th tatzyr 🇯🇵 545 213 37ms 15 Mar 2025 First Prev 401–480 of 1,081 Next Last
