The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 28 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 561st jared-hughes 477 397 3ms 10 Sep 2022 562nd annaproxy 477 557 435ms 29 Mar 2022 563rd HumanEquivalentUnit 477 646 20ms 28 Nov 2023 564th jakobkordez 🇸🇮 476 234 13ms 30 Nov 2022 565th gastropner 476 454 4ms 16 Jul 2025 566th Lv0Sys 🇵🇱 473 352 16ms 20 Feb 2026 567th Babafaba 472 236 13ms 29 Oct 2025 568th stefangabos 🇷🇴 471 353 11ms 16 Sep 2022 569th primo-ppcg 🇹🇭 471 402 3ms 6 Jul 2021 570th tomh1012 471 564 476ms 25 days ago 571st Program-Pi 470 354 14ms 10 days ago 572nd d4rkne55 469 584 6ms 23 Feb 2018 573rd CatsAreFluffy 468 462 3ms 1 Jan 2023 574th Mabeloid 🇳🇴 466 239 25ms 4 May 2025 575th daisy-lau 466 357 12ms 10 Jun 2020 576th Neofox 463 592 6ms 18 Nov 2017 577th KatieLG 🇬🇧 462 241 20ms 6 May 2021 578th keelimeguy 🇺🇸 461 242 20ms 15 May 2025 579th hyvyys 461 361 11ms 19 Sep 2020 580th KatieLG 🇬🇧 461 754 17ms 25 May 2024 581st Shanethegamer 🇺🇸 461 862 45ms 23 Dec 2021 582nd Shanethegamer 🇺🇸 456 294 290ms 18 Mar 2024 583rd amazingalek 🇳🇴 456 582 416ms 20 Jan 2026 584th DialFrost 🇸🇬 455 245 22ms 10 Jan 2023 585th Schmitt-Very-Cool 454 525 596ms 3 Oct 2025 586th Babafaba 453 232 387ms 29 Oct 2025 587th prestosilver 🇺🇸 453 418 3ms 4 days ago 588th lgastako 453 655 208ms 2 Aug 2019 589th rambox11 452 479 4ms 24 Jun 2019 590th AlexDaniel 🇪🇪 449 166 156ms 14 Nov 2017 591st MeWhenI 🇻🇦 449 299 321ms 28 Jan 2023 592nd bac0id 449 584 2,867ms 10 Jan 2025 593rd Shanethegamer 🇺🇸 448 318 180ms 17 Dec 2024 594th Feluxus 448 532 425ms 15 Nov 2021 595th BlueSky555 448 586 2,825ms 8 Aug 2024 596th rucin93 🇵🇱 447 319 158ms 27 Dec 2024 597th iczelia 🇩🇪 447 372 11ms 19 Oct 2025 598th CaedenHarper 🇨🇦 445 374 13ms 29 Aug 2025 599th Bulmenisaurus 444 251 22ms 8 Aug 2024 600th ovs-code 🇩🇪 444 309 600ms 10 Mar 2024 601st MeWhenI 🇻🇦 443 237 618ms 13 Jul 2024 602nd retrohun 441 432 6ms 23 Aug 2025 603rd HoffmannJM 441 699 18ms 17 Nov 2021 604th Mabeloid 🇳🇴 440 239 556ms 4 May 2025 605th vaughad 440 308 906ms 22 Jan 2020 606th rumblesan 440 378 12ms 7 Dec 2018 606th voytxt 🇨🇿 440 378 12ms 19 Jun 2023 608th AlephSquirrel 439 254 15ms 22 Jan 2024 609th snoozingnewt 🇨🇦 439 543 390ms 24 Sep 2025 610th cmayer777 439 598 72ms 19 Dec 2022 611th primo-ppcg 🇹🇭 438 231 1,832ms 7 Feb 2023 612th janlelis 437 255 31ms 26 Aug 2025 613th KatieLG 🇬🇧 436 241 340ms 28 Oct 2024 614th inventshah 436 437 132ms 27 Aug 2022 615th c0d3-4-F00d 🇩🇪 435 610 406ms 21 Nov 2021 616th HumanoidCPU 434 498 4ms 25 Nov 2025 617th rifatx 432 615 436ms 22 Jul 2024 618th luuumine 🇫🇷 430 259 19ms 21 Oct 2025 619th najs91 430 618 439ms 15 Oct 2024 620th MeWhenI 🇻🇦 430 690 234ms 6 Nov 2023 621st eranws 429 388 11ms 10 Sep 2023 621st Yax42 🇫🇷 429 388 11ms 20 Jan 2026 623rd dokutan 429 638 13ms 1 Dec 2025 624th RaBa21 🇭🇺 427 261 21ms 13 Jul 2025 625th coreynash 427 390 13ms 24 Feb 2024 625th gigaprofisi 🇺🇸 427 390 12ms 10 Aug 2025 627th MeWhenI 🇻🇦 426 334 179ms 25 Oct 2024 628th dsntzn 🇸🇰 426 391 12ms 18 Aug 2020 629th MeWhenI 🇻🇦 426 618 25ms 15 Aug 2024 630th robin-scragg 425 262 21ms 27 Sep 2025 631st pikti 425 625 445ms 21 Nov 2021 632nd djeedjay 🇳🇱 424 510 5ms 27 Oct 2020 633rd BBoehm 🇩🇪 423 393 12ms 9 Feb 2021 634th AlephSquirrel 422 249 568ms 22 Jan 2024 635th squadb3 422 394 11ms 10 Oct 2019 636th Widgitty 420 515 5ms 24 Sep 2025 637th alemelis 418 328 739ms 23 Jul 2024 638th shreyasminocha 417 399 13ms 2 Aug 2020 638th xkacer 🇨🇿 417 399 12ms 30 Jan 2021 638th mrxz 🇳🇱 417 399 13ms 9 May 2021 First Prev 561–640 of 1,081 Next Last
